Question

a. Name and explain any four lymphoid organs present in humans.

b. Categorise the named lymphoid organs as primary or secondary lymphoid
organs, giving reasons.​

Answer 1

Answer

• The lymphoid organs in the human body include the spleen, lymph nodes, bone marrow, thymus and lymph tissue. Lymph nodes- These are small, bean-shaped structures which produce and store cells, specialized in fighting infections. ... The spleen is an organ that also disposes of old, damaged blood cells.
• The primary lymphoid organs are bone narrow and thymus where immature lymphocytes differentiate into antigen sensitive lymphocytes. The secondary lymphoid organs are spleen, lymph nodes, tonsils.

Answer 2

Answer:

a,Lymphoid organs

Bone marrow. Bone marrow is a sponge-like tissue found inside the bones. ...

Thymus. The thymus is located behind the breastbone above the heart. ...

Lymph nodes. Lymph nodes are small bean-shaped tissues found along the lymphatic vessels. ...

Spleen. ...

Tonsils. ...

Mucous membranes.

b.The primary lymphoid organs are bone narrow and thymus where immature lymphocytes differentiate into antigen sensitive lymphocytes. The secondary lymphoid organs are spleen, lymph nodes, tonsils.