Which one has oxygen storing capacity

Options

A. myoglobin
B. actin
C. myosin
D. fibrin

Answer

To answer the question "Which one has oxygen storing capacity?", we will analyze the options provided:

1. **Myoglobin**:
- Myoglobin is a protein found in muscle tissues. Its primary function is to store oxygen and facilitate its transport within muscle cells. It binds oxygen molecules and releases them when needed, especially during muscular activity. Therefore, myoglobin has a significant oxygen-storing capacity.

2. **Actin**:
- Actin is a protein that forms thin filaments in muscle fibers. It plays a crucial role in muscle contraction and movement but does not have the capacity to store oxygen.

3. **Myosin**:
- Myosin is another protein found in muscle fibers, forming thick filaments. Like actin, myosin is involved in muscle contraction and movement but does not store oxygen.

4. **Fibrin**:
- Fibrin is a protein involved in blood clotting. It helps form a mesh that traps blood cells to stop bleeding. Fibrin does not have any role in oxygen storage.

Based on this analysis, the correct answer to the question is **myoglobin**, as it is the only option that has the capacity to store oxygen.

### Final Answer:
**Myoglobin** has oxygen-storing capacity.