What would/could happen if there was a problem with one cell in the body? Does the body have a repair system?
There is a 'self-destruct' button in every cell called the lymphocyte. It's a packet of enzymes that is designed to kill the cell in case of a problem, so no, it happens and is normal. The problem you run into in cancer cells is that they don't have these 'self-destruct' buttons and the cells grow out of control.
Martes, Mayo 4, 2010
Hematocrit
Whole blood is composed of plasma (liquid), cells and platelets. If whole blood is placed into a tube and centrifuged, the cells and the plasma will separate. The erythrocytes, which are heavy, will pack into the bottom of the tube, the plasma will be at the top of the tube, and the leukocytes and platelets will form a thin layer (buffy coat) between the erythrocytes and the plasma.
Whole blood is composed of plasma (liquid), cells and platelets. If whole blood is placed into a tube and centrifuged, the cells and the plasma will separate. The erythrocytes, which are heavy, will pack into the bottom of the tube, the plasma will be at the top of the tube, and the leukocytes and platelets will form a thin layer (buffy coat) between the erythrocytes and the plasma.
Erythropoesis
The body must have a way to assess the concentration of erythrocytes in the blood such that erythrocytes are produced at a rate that matches the body's needs. The regulation and production of RBCs is called erythropoesis. The mechanism of erythropoesis occurs in the following way. The kidney monitors the level of oxygen in the blood. If oxygen levels are low then the kidney secretes a hormone called erythropoetin.
The body must have a way to assess the concentration of erythrocytes in the blood such that erythrocytes are produced at a rate that matches the body's needs. The regulation and production of RBCs is called erythropoesis. The mechanism of erythropoesis occurs in the following way. The kidney monitors the level of oxygen in the blood. If oxygen levels are low then the kidney secretes a hormone called erythropoetin.
Blood Cells
Blood cells are formed in the bone marrow. All blood cells arise from the same bone marrow stem cells. Stem cells are immortal, meaning they never die (at least not until you do). Stem cells are also undifferentiated. meaning they have not yet developed into a particular cell type. Furthermore, stem cells are pluripotent, meaning they have the potential to become any type of blood cell.
Blood cells are formed in the bone marrow. All blood cells arise from the same bone marrow stem cells. Stem cells are immortal, meaning they never die (at least not until you do). Stem cells are also undifferentiated. meaning they have not yet developed into a particular cell type. Furthermore, stem cells are pluripotent, meaning they have the potential to become any type of blood cell.
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