How do red blood cells enter the circulatory system?

In summary, red blood cells, also known as reticulocytes, are created in the bone marrow and then enter the circulatory system by being absorbed into the nearest capillary. They are constantly being produced at a rate of 1-2 million per second. Therefore, it is correct to say that red blood cells are created in the bone marrow but they only become red blood cells once they enter the capillary.
  • #1
sameeralord
662
3
Hello everyone,

I just started biology and I have lots of clarifications If red blood cells are created in the bone marrow how do they enter the circulatory system. Do they permeate through the blood vessels?
 
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  • #2
Red blood cells begin as Reticulocytes in the marrow and navigate through the small pores in the large bones of the body. They are quickly absorbed by the nearest capillary into service. You make roughly 1 - 2 million per second.
 
  • #3
getitright said:
Red blood cells begin as Reticulocytes in the marrow and navigate through the small pores in the large bones of the body. They are quickly absorbed by the nearest capillary into service. You make roughly 1 - 2 million per second.

Thanks Getitright :smile: So is it wrong when we say red blood cells instead of reticulocytes are created in the bone marrow. Do they only become red blood cells when it enters the cappillary?
 
  • #4
Correct. Good job.
 

1. How are red blood cells produced?

Red blood cells are produced in the bone marrow through a process called erythropoiesis. The bone marrow contains stem cells that can develop into different types of blood cells, including red blood cells.

2. How do red blood cells enter the circulatory system?

Red blood cells are released into the bloodstream from the bone marrow. They then travel through the circulatory system to reach their destination in the body.

3. What is the purpose of red blood cells?

The main purpose of red blood cells is to transport oxygen from the lungs to tissues and organs throughout the body. They also help remove carbon dioxide from the body through the process of respiration.

4. How long do red blood cells live in the body?

The average lifespan of a red blood cell is about 120 days. After this time, they are removed from the bloodstream and replaced with new red blood cells.

5. Can red blood cells be replaced or replenished?

Yes, the body constantly produces new red blood cells to replace old or damaged ones. This process is regulated by the hormone erythropoietin, which is released by the kidneys in response to low oxygen levels in the body.

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