Which of the following can't be taken as the function of estrogen ?

Options

A. Increases ciliary activity of uterine tubes
B. Stimulates growth of external genitalia
C. Feed back effects on hypothalamus and anterior pituitary
D. It is milk ejection hormone.

Answer

To determine which of the following options cannot be taken as a function of estrogen, we will analyze each option provided:

1. **Increases the reactivity of the uterine tubes**:
- Estrogen is known to increase the ciliary activity in the uterine (Fallopian) tubes, which enhances the transport of the ovum. Therefore, this statement is true regarding the function of estrogen.

2. **Stimulate growth of external genitalia**:
- Estrogen plays a crucial role in the development and maturation of external genitalia during puberty and is involved in the maintenance of these structures. This statement is also true regarding the function of estrogen.

3. **Feedback effects on the hypothalamus and the anterior pituitary**:
- Estrogen has a positive feedback effect on the hypothalamus and anterior pituitary, stimulating the release of hormones like follicle-stimulating hormone (FSH) and luteinizing hormone (LH). This statement is true as well.

4. **Milk Ejection Hormone**:
- The milk ejection reflex is primarily controlled by oxytocin, not estrogen. Estrogen does not have a direct role in milk ejection. Therefore, this statement is false regarding the function of estrogen.

After analyzing all the options, the correct answer is **option 4: Milk Ejection Hormone**, as this is not a function of estrogen.