The cluster of cells responsible for secreting milk is present in the

Options

A. mammary lobes
B. mammary duct
C. mammary ampulla
D. mammary tubules

Answer

To solve the question regarding the cluster of cells responsible for secreting milk, let's break it down step by step:

### Step-by-Step Solution:

1. **Understanding Mammary Glands**:
- Mammary glands are specialized organs found in female mammals that are responsible for milk production. They are a characteristic feature of all female mammals.

2. **Structure of Mammary Glands**:
- The mammary glands consist of glandular tissue and a variable amount of fat. This glandular tissue is organized into lobes.

3. **Mammary Lobes**:
- The glandular tissue is divided into 15 to 20 mammary lobes. Each lobe contains smaller structures known as alveoli.

4. **Function of Alveoli**:
- Alveoli are clusters of cells within the mammary lobes that are specifically responsible for the secretion of milk. They produce and secrete milk during lactation.

5. **Milk Storage and Transport**:
- The milk produced in the alveoli is stored in their cavities. From the alveoli, milk is transported through mammary tubules, which then converge to form mammary ducts.

6. **Final Pathway**:
- Several mammary ducts come together to form the mammary ampulla, which is connected to the lactiferous duct. This duct is responsible for the ejection of milk during breastfeeding.

7. **Conclusion**:
- Therefore, the cluster of cells responsible for secreting milk is located in the **mammary lobes**.

### Final Answer:
- The cluster of cells responsible for secreting milk is present in **A. Mammary lobes**.