Blood Cells Anahi Ramirez

Blood Cells

The structure of an blood cells Blood Cells are formed in the 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 became any type of blood cell.

The structure of an blood cells These immortal, undifferentiated, pluripotent stem cells give a rise to erythrocytes, leukocytes and platelets. The blood consist of an suspension of special cells in a liquid celled plasma. In an adult man, the blood Is about 1/12 th of the body weight and this corresponds to 5-6 litres. Blood consist of 55% plasma, and 45% by cells called formed elements.

Functions of an Blood Cells The blood performs a lot of important functions. By means of the hemoglobin contained in the erythrocytes, it carries oxygen to the tissues and collects the carbon dioxide (CO2). It also conveys nutritive substances (e.g animo acids, sugars, mineral salts) and gathers the excreted material which will be eliminated through the renal filter.

Functions of an Blood Cells The blood performs a lot of important functions. By means of the hemoglobin contained in the erythrocytes, it carries oxygen to the tissues and collects the carbon dioxide (CO2). It also conveys nutritive substances (e.g animo acids, sugars, mineral salts) and gathers the excreted material which will be eliminated through the renal filter.

Functions of an Blood Cells The blood also carries hormones, enzymes and vitamins. It performs the defense of the organism by mean of the phagocitic activity of the leukocytes, the bactericidal power of the serum and the organism by mean the lymphocytes are the protagonists.

Osmosis Mammalian red blood cells have a biconcave (doughnut-like) shape. If red blood cells are placed a 0.3 M NaCl solution there is little net osmotic movement of water the size and shape of the cells stay the same; the NaCl solution is isotonic to the cell. If red blood cells are in a solution with a lower solute concentration than is found in the cells, water moves into the cells by osmosis.

Osmosis Mammalian red blood cells have a biconcave (doughnut-like) shape. If red blood cells are placed in a 0.3 M NaCl solution, there is little net osmotic movement of water, the size and shape of the cells stay the same; the NaCl solution is isotonic to the cell. If red blood cells are placed in a solution with a lower solute concentration than is found in the cells, water moves into the cells by osmosis, causing the cells to swell; such a solution is hypotonic to the cells.

Osmosis When red blood cells are placed in pure water, water rapidly enters the cells by osmosis and causes the cells to burst, a phenomenon known as hemolysis. If the red blood cells are placed in a solution with a higher solute concentration, water moves out of the cell by osmosis, the cell becomes smaller and crenated in shape; such a solution is hypertonic to the cells.

Diffusion In humans, mature red blood cells are flexible biconcave disks that lack a cell nucleus and most organelles. The cells develop in the bone marrow and circulate for about 100–120 days in the body before their components are recycled by macrophages. Each circulation takes about 20 seconds. Approximately a quarter of the cells in the human body are red blood cells.