Question

1. Reticular fibers:

1. Are abundant in the framework of hematopoietic organs.
2. Are PAS stain positive.
3. Are abundant in the network of the thymus.
4. All of the above are true.
5. Only a + c are true.

2. Osteoclasts:

1. Are giant cells as large as 100 micrometer in diameter.
2. May contain as many as 50 Nuclei.
3. Are frequently located in Howship's Lacunae.
4. All of the above are true.
5. Only a + c are true.

3. Lymph Nodes:

1. Range in size from about 1mm to about 1 – 2 cm.
2. Are bean – shaped.
3. Have a connective tissue capsule.
4. All of the above are true.
5. Only b + c are true.

Answer 1

1) Reticular fibres :-

(d) All of the above are true.

Reticular fibers stain poorly with hematoxylin-eosin (H&E) stain. But are PAS (periodic acid Schiff) postive as they have high polysaccharide content.

They are present in kidney, bone marrow, spleen, lymph nodes. Their main function is to form stroma and provide structural support such as that in lymphoid organs e.g red bone marrow, spleen and lymph node stromal cells. So they are abundant in framework of hematopoietic organs.

Also they present in stroma of thymus so are abundant in the network of thymus .

Since all the above options are true.

Thus the correct answer is (d) All of the above.

2) Osteoclasts :-

(e) Only a + c are true.

Osteoclasts are giant cells which are 150-200 micrometre in diameter. When Osteoclast inducing cytokines are used to convert macrophages to osteoclasts then very large cell that may reach 100 micrometre in diameter. So option (a) is correct.

In bone, osteoclasts are found in pits in the bone surface called as Howship's lacunae. So option (c) is correct.

Osteoclasts may contain as may as 200 nuclei. But they typically have 5-20 nuclei. So the option (b) is incorrect.

Since both (a) & (c) are true for Osteoclasts.

Thus the correct answer is (e) a + c are true.

3) Lymph nodes :-

(d) All of the above are true.

They are kidney (bean) or oval shaped range in size from 0.1 - 2 cm long. These bean shaped glands produce immune cells and filter impurities from the lymphatic system and bloodstream.

Each lymph node is surrounded by a fibrous capsule which extends inside the lymph node to form trabeculae.

So all of the above are true.