Red Blood Cells - Diff

'''Red blood cells''', also called '''erythrocytes''', are blood cells that carry oxygen from the lungs to body tissues and help carry carbon dioxide back towards the lungs. They are the most numerous cells in human blood and are essential for normal oxygen delivery.

'''Red blood cells''', also called '''erythrocytes''', are blood cells that carry oxygen from the lungs to body tissues and help carry carbon dioxide back towards the lungs. They are the most numerous cells in human blood and are essential for normal oxygen delivery.

Red blood cells are specialised for transport. In humans they are small, flexible, biconcave discs with no nucleus. Their shape gives them a large surface area and helps them squeeze through tiny blood vessels.

Red blood cells are specialised for transport. In humans they are small, flexible, biconcave discs with no nucleus. Their shape gives them a large surface area and helps them squeeze through tiny blood vessels.

== Structure ==

== Structure ==

Mature human red blood cells do not contain a nucleus or most internal organelles. This leaves more internal space for haemoglobin, the iron-containing protein that binds oxygen. Haemoglobin also gives blood its red colour.

Mature human red blood cells do not contain a nucleus or most internal organelles. This leaves more internal space for haemoglobin, the iron-containing protein that binds oxygen. Haemoglobin also gives blood its red colour.

The biconcave shape is important. It helps red blood cells pass through capillaries and improves gas exchange. Their membrane is flexible, but it can be damaged by inherited conditions, immune attack, infection, toxins, or mechanical stress.

The biconcave shape is important. It helps red blood cells pass through capillaries and improves gas exchange. Their membrane is flexible, but it can be damaged by inherited conditions, immune attack, infection, toxins, or mechanical stress.

== Function ==

== Function ==

The main function of a red blood cell is gas transport. In the lungs, oxygen binds to haemoglobin. In body tissues, where oxygen levels are lower, haemoglobin releases oxygen so cells can use it in metabolism.

The main function of a red blood cell is gas transport. In the lungs, oxygen binds to haemoglobin. In body tissues, where oxygen levels are lower, haemoglobin releases oxygen so cells can use it in metabolism.

Red blood cells also help carry carbon dioxide away from tissues. Some carbon dioxide binds to haemoglobin, but much of it is carried in the blood as bicarbonate after conversion by enzymes inside red blood cells. This means red blood cells also help maintain blood acidity within a narrow range.

Red blood cells also help carry carbon dioxide away from tissues. Some carbon dioxide binds to haemoglobin, but much of it is carried in the blood as bicarbonate after conversion by enzymes inside red blood cells. This means red blood cells also help maintain blood acidity within a narrow range.

== Production ==

== Production ==

Red blood cell production is called erythropoiesis. It takes place mainly in the bone marrow. The process begins with blood-forming stem cells and passes through several immature stages before reticulocytes enter the bloodstream and mature.

Red blood cell production is called erythropoiesis. It takes place mainly in the bone marrow. The process begins with blood-forming stem cells and passes through several immature stages before reticulocytes enter the bloodstream and mature.

Erythropoietin, often shortened to EPO, is a hormone that stimulates red blood cell production. The kidneys produce more erythropoietin when oxygen delivery is low. Merck Manual states that red blood cell production also needs enough iron, vitamin B12, folate, and haem.

Erythropoietin, often shortened to EPO, is a hormone that stimulates red blood cell production. The kidneys produce more erythropoietin when oxygen delivery is low. Merck Manual states that red blood cell production also needs enough iron, vitamin B12, folate, and haem.

== Lifespan and Recycling ==

== Lifespan and Recycling ==

A typical human red blood cell circulates for about 120 days. Old or damaged cells are removed mainly by macrophages in the spleen, liver, and bone marrow. Useful material is recycled. Iron from haemoglobin can be stored and reused to make new red blood cells.

A typical human red blood cell circulates for about 120 days. Old or damaged cells are removed mainly by macrophages in the spleen, liver, and bone marrow. Useful material is recycled. Iron from haemoglobin can be stored and reused to make new red blood cells.

This recycling is constant because the body makes and removes large numbers of red blood cells every day. Problems with production, destruction, or blood loss can quickly affect oxygen delivery.

This recycling is constant because the body makes and removes large numbers of red blood cells every day. Problems with production, destruction, or blood loss can quickly affect oxygen delivery.

== Blood Tests ==

== Blood Tests ==

Red blood cells are measured in common blood tests. A full blood count may include red blood cell count, haemoglobin concentration, haematocrit, mean cell volume, and other indices. These results help clinicians assess anaemia, blood loss, dehydration, inflammation, kidney disease, nutritional deficiency, inherited blood disorders, and bone marrow problems.

Red blood cells are measured in common blood tests. A full blood count may include red blood cell count, haemoglobin concentration, haematocrit, mean cell volume, and other indices. These results help clinicians assess anaemia, blood loss, dehydration, inflammation, kidney disease, nutritional deficiency, inherited blood disorders, and bone marrow problems.

Laboratory values need clinical context. A single abnormal result can have several possible causes, and normal ranges can differ by age, sex, pregnancy, altitude, laboratory method, and medical history.

Laboratory values need clinical context. A single abnormal result can have several possible causes, and normal ranges can differ by age, sex, pregnancy, altitude, laboratory method, and medical history.

== Related Conditions ==

== Related Conditions ==

Red blood cell problems include:

Red blood cell problems include:

* [[Anemia|Anaemia]], where the blood has too little haemoglobin or too few effective red blood cells.

* [[Anemia|Anaemia]], where the blood has too little haemoglobin or too few effective red blood cells.

* Iron-deficiency anaemia, often linked to blood loss, diet, pregnancy, absorption problems, or inflammation.

* Iron-deficiency anaemia, often linked to blood loss, diet, pregnancy, absorption problems, or inflammation.

* Sickle cell disease, where abnormal haemoglobin can make red blood cells rigid and sickle-shaped.

* Sickle cell disease, where abnormal haemoglobin can make red blood cells rigid and sickle-shaped.

* [[Thalassemia|Thalassaemia]], a group of inherited disorders affecting haemoglobin production.

* [[Thalassemia|Thalassaemia]], a group of inherited disorders affecting haemoglobin production.

* Haemolysis, where red blood cells are destroyed too quickly.

* Haemolysis, where red blood cells are destroyed too quickly.

* Polycythaemia, where red blood cell mass is abnormally high.

* Polycythaemia, where red blood cell mass is abnormally high.

Kidney disease can contribute to anaemia because damaged kidneys may not make enough erythropoietin. The National Heart, Lung, and Blood Institute notes this relationship in its patient information on iron-deficiency anaemia and related causes.

Kidney disease can contribute to anaemia because damaged kidneys may not make enough erythropoietin. The National Heart, Lung, and Blood Institute notes this relationship in its patient information on iron-deficiency anaemia and related causes.

== Terminology ==

== Terminology ==

The word erythrocyte comes from Greek roots meaning red cell. In everyday language, red blood cell is clearer. In medical writing, RBC is often used as an abbreviation.

The word erythrocyte comes from Greek roots meaning red cell. In everyday language, red blood cell is clearer. In medical writing, RBC is often used as an abbreviation.

The protein name is written '''haemoglobin''' in British English and '''hemoglobin''' in American English. Both refer to the same oxygen-binding protein.

The protein name is written '''haemoglobin''' in British English and '''hemoglobin''' in American English. Both refer to the same oxygen-binding protein.

== See Also ==

== See Also ==

* [[Anemia]]

* [[Anemia]]

* [[Hemoglobin]]

* [[Hemoglobin]]

* [[Thalassemia]]

* [[Thalassemia]]

* [[Virus]]

* [[Virus]]

== References ==

== References ==

* [https://www.ncbi.nlm.nih.gov/books/NBK539702/ NCBI Bookshelf: Histology, Red Blood Cell]

* [https://www.ncbi.nlm.nih.gov/books/NBK539702/ NCBI Bookshelf: Histology, Red Blood Cell]

* [https://www.merckmanuals.com/professional/hematology-and-oncology/approach-to-the-patient-with-anemia/red-blood-cell-production Merck Manual Professional Edition: Red Blood Cell Production]

* [https://www.merckmanuals.com/professional/hematology-and-oncology/approach-to-the-patient-with-anemia/red-blood-cell-production Merck Manual Professional Edition: Red Blood Cell Production]

* [https://www.nhlbi.nih.gov/health/anemia/iron-deficiency-anemia NHLBI: Iron-Deficiency Anemia]

* [https://www.nhlbi.nih.gov/health/anemia/iron-deficiency-anemia NHLBI: Iron-Deficiency Anemia]

[[Category:Medicine]]

[[Category:Medicine]]

[[Category:Biology]]

[[Category:Biology]]

[[Category:Blood]]

[[Category:Blood]]

Old	New
'''Red blood cells''', also called '''erythrocytes''', are blood cells that carry oxygen from the lungs to body tissues and help carry carbon dioxide back towards the lungs. They are the most numerous cells in human blood and are essential for normal oxygen delivery.	'''Red blood cells''', also called '''erythrocytes''', are blood cells that carry oxygen from the lungs to body tissues and help carry carbon dioxide back towards the lungs. They are the most numerous cells in human blood and are essential for normal oxygen delivery.

Red blood cells are specialised for transport. In humans they are small, flexible, biconcave discs with no nucleus. Their shape gives them a large surface area and helps them squeeze through tiny blood vessels.	Red blood cells are specialised for transport. In humans they are small, flexible, biconcave discs with no nucleus. Their shape gives them a large surface area and helps them squeeze through tiny blood vessels.

== Structure ==	== Structure ==
Mature human red blood cells do not contain a nucleus or most internal organelles. This leaves more internal space for haemoglobin, the iron-containing protein that binds oxygen. Haemoglobin also gives blood its red colour.	Mature human red blood cells do not contain a nucleus or most internal organelles. This leaves more internal space for haemoglobin, the iron-containing protein that binds oxygen. Haemoglobin also gives blood its red colour.

The biconcave shape is important. It helps red blood cells pass through capillaries and improves gas exchange. Their membrane is flexible, but it can be damaged by inherited conditions, immune attack, infection, toxins, or mechanical stress.	The biconcave shape is important. It helps red blood cells pass through capillaries and improves gas exchange. Their membrane is flexible, but it can be damaged by inherited conditions, immune attack, infection, toxins, or mechanical stress.

== Function ==	== Function ==
The main function of a red blood cell is gas transport. In the lungs, oxygen binds to haemoglobin. In body tissues, where oxygen levels are lower, haemoglobin releases oxygen so cells can use it in metabolism.	The main function of a red blood cell is gas transport. In the lungs, oxygen binds to haemoglobin. In body tissues, where oxygen levels are lower, haemoglobin releases oxygen so cells can use it in metabolism.

Red blood cells also help carry carbon dioxide away from tissues. Some carbon dioxide binds to haemoglobin, but much of it is carried in the blood as bicarbonate after conversion by enzymes inside red blood cells. This means red blood cells also help maintain blood acidity within a narrow range.	Red blood cells also help carry carbon dioxide away from tissues. Some carbon dioxide binds to haemoglobin, but much of it is carried in the blood as bicarbonate after conversion by enzymes inside red blood cells. This means red blood cells also help maintain blood acidity within a narrow range.

== Production ==	== Production ==
Red blood cell production is called erythropoiesis. It takes place mainly in the bone marrow. The process begins with blood-forming stem cells and passes through several immature stages before reticulocytes enter the bloodstream and mature.	Red blood cell production is called erythropoiesis. It takes place mainly in the bone marrow. The process begins with blood-forming stem cells and passes through several immature stages before reticulocytes enter the bloodstream and mature.

Erythropoietin, often shortened to EPO, is a hormone that stimulates red blood cell production. The kidneys produce more erythropoietin when oxygen delivery is low. Merck Manual states that red blood cell production also needs enough iron, vitamin B12, folate, and haem.	Erythropoietin, often shortened to EPO, is a hormone that stimulates red blood cell production. The kidneys produce more erythropoietin when oxygen delivery is low. Merck Manual states that red blood cell production also needs enough iron, vitamin B12, folate, and haem.

== Lifespan and Recycling ==	== Lifespan and Recycling ==
A typical human red blood cell circulates for about 120 days. Old or damaged cells are removed mainly by macrophages in the spleen, liver, and bone marrow. Useful material is recycled. Iron from haemoglobin can be stored and reused to make new red blood cells.	A typical human red blood cell circulates for about 120 days. Old or damaged cells are removed mainly by macrophages in the spleen, liver, and bone marrow. Useful material is recycled. Iron from haemoglobin can be stored and reused to make new red blood cells.

This recycling is constant because the body makes and removes large numbers of red blood cells every day. Problems with production, destruction, or blood loss can quickly affect oxygen delivery.	This recycling is constant because the body makes and removes large numbers of red blood cells every day. Problems with production, destruction, or blood loss can quickly affect oxygen delivery.

== Blood Tests ==	== Blood Tests ==
Red blood cells are measured in common blood tests. A full blood count may include red blood cell count, haemoglobin concentration, haematocrit, mean cell volume, and other indices. These results help clinicians assess anaemia, blood loss, dehydration, inflammation, kidney disease, nutritional deficiency, inherited blood disorders, and bone marrow problems.	Red blood cells are measured in common blood tests. A full blood count may include red blood cell count, haemoglobin concentration, haematocrit, mean cell volume, and other indices. These results help clinicians assess anaemia, blood loss, dehydration, inflammation, kidney disease, nutritional deficiency, inherited blood disorders, and bone marrow problems.

Laboratory values need clinical context. A single abnormal result can have several possible causes, and normal ranges can differ by age, sex, pregnancy, altitude, laboratory method, and medical history.	Laboratory values need clinical context. A single abnormal result can have several possible causes, and normal ranges can differ by age, sex, pregnancy, altitude, laboratory method, and medical history.

== Related Conditions ==	== Related Conditions ==
Red blood cell problems include:	Red blood cell problems include:

* [[Anemia\|Anaemia]], where the blood has too little haemoglobin or too few effective red blood cells.	* [[Anemia\|Anaemia]], where the blood has too little haemoglobin or too few effective red blood cells.
* Iron-deficiency anaemia, often linked to blood loss, diet, pregnancy, absorption problems, or inflammation.	* Iron-deficiency anaemia, often linked to blood loss, diet, pregnancy, absorption problems, or inflammation.
* Sickle cell disease, where abnormal haemoglobin can make red blood cells rigid and sickle-shaped.	* Sickle cell disease, where abnormal haemoglobin can make red blood cells rigid and sickle-shaped.
* [[Thalassemia\|Thalassaemia]], a group of inherited disorders affecting haemoglobin production.	* [[Thalassemia\|Thalassaemia]], a group of inherited disorders affecting haemoglobin production.
* Haemolysis, where red blood cells are destroyed too quickly.	* Haemolysis, where red blood cells are destroyed too quickly.
* Polycythaemia, where red blood cell mass is abnormally high.	* Polycythaemia, where red blood cell mass is abnormally high.

Kidney disease can contribute to anaemia because damaged kidneys may not make enough erythropoietin. The National Heart, Lung, and Blood Institute notes this relationship in its patient information on iron-deficiency anaemia and related causes.	Kidney disease can contribute to anaemia because damaged kidneys may not make enough erythropoietin. The National Heart, Lung, and Blood Institute notes this relationship in its patient information on iron-deficiency anaemia and related causes.

== Terminology ==	== Terminology ==
The word erythrocyte comes from Greek roots meaning red cell. In everyday language, red blood cell is clearer. In medical writing, RBC is often used as an abbreviation.	The word erythrocyte comes from Greek roots meaning red cell. In everyday language, red blood cell is clearer. In medical writing, RBC is often used as an abbreviation.

The protein name is written '''haemoglobin''' in British English and '''hemoglobin''' in American English. Both refer to the same oxygen-binding protein.	The protein name is written '''haemoglobin''' in British English and '''hemoglobin''' in American English. Both refer to the same oxygen-binding protein.

== See Also ==	== See Also ==
* [[Anemia]]	* [[Anemia]]
* [[Hemoglobin]]	* [[Hemoglobin]]
* [[Thalassemia]]	* [[Thalassemia]]
* [[Virus]]	* [[Virus]]

== References ==	== References ==
* [https://www.ncbi.nlm.nih.gov/books/NBK539702/ NCBI Bookshelf: Histology, Red Blood Cell]	* [https://www.ncbi.nlm.nih.gov/books/NBK539702/ NCBI Bookshelf: Histology, Red Blood Cell]
* [https://www.merckmanuals.com/professional/hematology-and-oncology/approach-to-the-patient-with-anemia/red-blood-cell-production Merck Manual Professional Edition: Red Blood Cell Production]	* [https://www.merckmanuals.com/professional/hematology-and-oncology/approach-to-the-patient-with-anemia/red-blood-cell-production Merck Manual Professional Edition: Red Blood Cell Production]
* [https://www.nhlbi.nih.gov/health/anemia/iron-deficiency-anemia NHLBI: Iron-Deficiency Anemia]	* [https://www.nhlbi.nih.gov/health/anemia/iron-deficiency-anemia NHLBI: Iron-Deficiency Anemia]

[[Category:Medicine]]	[[Category:Medicine]]
[[Category:Biology]]	[[Category:Biology]]
[[Category:Blood]]	[[Category:Blood]]

Diff: Red Blood Cells