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What is true of leucocytes?...

What is true of leucocytes?

A

These can squeeze out through ( can cross ) the capillary walls

B

These are enucleate

C

Sudden fall in their number indicates cancer

D

These are produced in thymus

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Leukocytes**: - Leukocytes, also known as white blood cells (WBCs), are a crucial component of the immune system. They are colorless cells that help defend the body against infections and foreign invaders. 2. **Identifying the True Statement**: - The question asks for a true statement regarding leukocytes. We will evaluate each statement provided. 3. **Evaluating the Statements**: - **Statement 1**: "Leukocytes can squeeze out through the capillary walls." - This statement is true. Leukocytes can change shape and use pseudopodia to move out of the bloodstream and into tissues, especially during inflammation. This process is known as diapedesis. - **Statement 2**: "RBCs are enucleated, the WBCs are enucleated." - This statement is false. While red blood cells (RBCs) are indeed enucleated (lack a nucleus), leukocytes (WBCs) have a nucleus, which can be multi-lobed in some types. - **Statement 3**: "A sudden fall in their number will indicate cancer." - This statement is false. A sudden rise in the number of leukocytes is typically indicative of conditions such as leukemia (blood cancer), not a fall. - **Statement 4**: "Leukocytes are produced in the thymus." - This statement is false. While some types of white blood cells (like T-lymphocytes) mature in the thymus, all blood cells, including leukocytes, are primarily produced in the bone marrow. 4. **Conclusion**: - After evaluating all statements, the only true statement regarding leukocytes is that they can squeeze out through the capillary walls (Statement 1). ### Final Answer: The true statement about leukocytes is: "Leukocytes can squeeze out through the capillary walls."

### Step-by-Step Solution: 1. **Understanding Leukocytes**: - Leukocytes, also known as white blood cells (WBCs), are a crucial component of the immune system. They are colorless cells that help defend the body against infections and foreign invaders. 2. **Identifying the True Statement**: - The question asks for a true statement regarding leukocytes. We will evaluate each statement provided. ...
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