34. Know what happens in the lymph flows through them 35, How does the spleen he

Question

34. Know what happens in the lymph flows through them 35, How does the spleen help the immune system, ? 36. How does the spleen help maintain blood? 37. What is the role of mucus in the immune system 38, what is the role of the salivary glands is to 39. Which substance is secreted by glands, then deposited on the surface of the epidermal cells, where it makes a protective barrier against pathogens ? 40, which substance uses ph to keep microbial invaders out of the cervical region 41. How does fever affect microbes? 42. what passes through the urethra to clear it of microbes ? 43, why is tissue warm when it is inflamed ? 44, what is pus-? 45, what is an Antigen_-- ? what is self tolerance- 46. ? 47, what is an Autoimmune disease ? 48. What is AIDS 49, Know the substance(s) that can kill HI ? 50. Know as the body ages, the T-cells and B-cells become less responsive to 51. Know the function of the thymus

Explanation / Answer

35. Spleen is the lymphatic tissue measuring about 12 cms in length and is located in the left side between stomach and diaphragm. Spleen consists of two kinds of tissue matter called white pulp which is lymphatic tissue and contains mostly lymphocytes and macrophages. Red pulp consists of blood ,RBCs, macrophages , lymphocytes and granulocytes. B and T Lymphocytes after their maturation in bone marrow thymus gland respectively migrate to lymphoid tissue and spleen where they carry out immune functions while as spleen macrophages destroy blood borne pathogens by phagocytosis.

36. Red pulp of spleen maintains blood through following ways;

1. Removal of worn out or defective blood cells and platelets.

2. Storage of platelets.

3. Production of blood cells during fatal life.

37. Mucus serves as an important part as defence mechanism. It helps to trap pathogens and microbes and does not allow them to enter into the body thorough body opening like nose and mouth.

38. Salivary gland produces a watery nearly neutral fluid called saliva. Saliva contains water, mucus, salts and an enzyme salivary amylase.

39. Sweat is produced by sweat glands that is deposited on the epidermal surface of skin.

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