Most radiosensitive tissue of body is :

Options

A. bone marrow
B. platelet
C. nervous
D. lymphocyte

Answer

To determine the most radiosensitive tissue in the human body, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Radiosensitivity**:
- Radiosensitivity refers to the susceptibility of cells, tissues, or organs to the damaging effects of radiation. This can vary significantly among different types of cells and tissues.

2. **Identifying the Options**:
- The options provided are:
- Bone marrow
- Platelet
- Nervous tissue
- Lymphocyte

3. **Analyzing Each Option**:
- **Bone Marrow**:
- Bone marrow contains stem cells that are undifferentiated and actively dividing. This high rate of cell division makes them more susceptible to radiation damage.
- **Platelet**:
- Platelets are not tissues but rather cell fragments derived from megakaryocytes in the bone marrow. They do not have a high rate of division.
- **Nervous Tissue**:
- Nervous tissue is composed of neurons, which are highly differentiated and do not divide frequently. This makes them less sensitive to radiation.
- **Lymphocyte**:
- Lymphocytes are a type of white blood cell and do have some sensitivity to radiation, but they are not as radiosensitive as the cells found in the bone marrow.

4. **Conclusion**:
- Given that the radiosensitivity of cells is directly proportional to their rate of division and inversely proportional to their degree of differentiation, bone marrow, with its undifferentiated and highly active cells, is the most radiosensitive tissue in the body.

5. **Final Answer**:
- The most radiosensitive tissue of the body is **Bone Marrow**.