Question

Answer the following questions.

(1) Spleen: Briefly describe the circulatory pattern in the spleen. For instance, closed v. open circulation.

(2) Thymus: What is the role of the thymus and what is the predominant type of tissue found in the thymus in a young child?

(3) Lymph Nodes: Describe the particular locations of the T-cells and B cells in lymph nodes.

Answer 1

3.B cells are found in the outer cortex where they are clustered together as follicular B cells in the lymphoid follicles and T cells are present in the paracortex.

1.In the closed circulation through the spleen the blood will empty from the vessels of the white pulp into the sheated capillaries of the red pulp and then directly into the sinuses.In open circulation of the spleen the blood empties into the sheated capillaries into the splenic cords and then enters the sinuses through the slits in the wall of the spleen.

2.Thymus is the specialised primary lymphoid organ of the immune system where the T cells of the immune system undergo maturation.The lymphoepithelial tissue of the thymus is predominant tissue in thymus of young children.