In response of increased returns of venous blood in heart, which hormone secretion begins and from which organ

Options

A. ADH from kidney
B. ANF from heart
C. Epinephrine from adrenal medulla
D. Noradrenaline from adrenal medulla.

Answer

To answer the question regarding the hormone secretion in response to increased returns of venous blood in the heart, we can follow these steps:

### Step 1: Understanding the Situation
When there is an increase in venous blood return to the heart, the heart experiences an increase in the volume of blood filling its chambers. This increased volume leads to the stretching of the heart walls.

**Hint:** Consider what happens to the heart when more blood returns to it.

### Step 2: Identifying the Response
The stretching of the heart walls triggers a physiological response. Specifically, the walls of the heart release a hormone in response to this stretch.

**Hint:** Think about what the heart does in response to being filled with more blood.

### Step 3: Identifying the Hormone
The hormone released in response to the stretching of the heart walls is Atrial Natriuretic Factor (ANF). This hormone is secreted by the atria of the heart.

**Hint:** Recall the name of the hormone that is associated with the heart and helps regulate blood volume.

### Step 4: Understanding the Function of ANF
ANF functions by binding to specific receptors in the kidneys, leading to an increase in sodium excretion. This process helps to decrease blood volume, counteracting the effects of increased venous return.

**Hint:** Consider how the body regulates blood volume and what role sodium plays in this process.

### Step 5: Conclusion
In conclusion, in response to increased returns of venous blood in the heart, the hormone that begins secretion is Atrial Natriuretic Factor (ANF), and it is released from the heart.

**Final Answer:** ANF from the heart.