write composition blood and also its functions
Answers
Blood is a specialized body fluid. It has four main components: plasma, red blood cells, white blood cells, and platelets.
Plasma
The liquid component of blood is called plasma, a mixture of water, sugar, fat, protein, and salts. The main job of the plasma is to transport blood cells throughout your body along with nutrients, waste products, antibodies, clotting proteins, chemical messengers such as hormones, and proteins that help maintain the body's fluid balance.
Red Blood Cells (also called erythrocytes or RBCs)
Known for their bright red color, red cells are the most abundant cell in the blood, accounting for about 40 to 45 percent of its volume. The shape of a red blood cell is a biconcave disk with a flattened center - in other words, both faces of the disc have shallow bowl-like indentations (a red blood cell looks like a donut).
White Blood Cells (also called leukocytes)
White blood cells protect the body from infection. They are much fewer in number than red blood cells, accounting for about 1 percent of your blood.
The most common type of white blood cell is the neutrophil, which is the "immediate response" cell and accounts for 55 to 70 percent of the total white blood cell count.
The other major type of white blood cell is a lymphocyte. There are two main populations of these cells. T lymphocytes help regulate the function of other immune cells and directly attack various infected cells and tumors. B lymphocytes make antibodies, which are proteins that specifically target bacteria, viruses, and other foreign materials.
Platelets (also called thrombocytes)
Unlike red and white blood cells, platelets are not actually cells but rather small fragments of cells. Platelets help the blood clotting process (or coagulation) by gathering at the site of an injury, sticking to the lining of the injured blood vessel, and forming a platform on which blood coagulation can occur. This results in the formation of a fibrin clot, which covers the wound and prevents blood from leaking out. Fibrin also forms the initial scaffolding upon which new tissue forms, thus promoting healing.
Answer:
Blood contain mainly three types of cells :-
(i) RBC ( Red Blood Cells ) : it contains haemoglobin which binds oxygen and transport it all over the body. It's presence also makes blood red in colour..
(ii)WBC ( White Blood Cells ) : it help us to fight against germs and diseases which enter our body...
(iii) Platelets : it's presence forms clotting which helps from blood loss.....
Explanation:
Hope it helped