Vasopressin and cortisol related with following activities performed inside the body :-
(a) Vasopressin secreted from posterior adrenal gland where cortisol from ant. pitutary gland
(b) Vasopressin stimulates reabsorption of electrolytes by distal tubules and cortisol releated with maintance of cardio vascular system.
(c) Cortisol related to RBC formation where vasopressin reduces loss of water.
(d) Vasopressin is anti diuretic where cortisol is life saving substance of endocrine glands

Options

A. a and b are true where c and d are false.
B. a, b, c are true where only d is false
C. a is true where b, c, d are false
D. a is false where b, c, d are true

Answer

To solve the question regarding the activities performed by Vasopressin and Cortisol in the body, we will analyze each option step by step.

### Step 1: Analyze the secretion sources of Vasopressin and Cortisol
- **Vasopressin** (also known as Antidiuretic Hormone, ADH) is produced in the hypothalamus and secreted from the posterior pituitary gland.
- **Cortisol** is a steroid hormone released from the adrenal cortex, not the anterior pituitary gland.

**Conclusion for Step 1**: The statement in option (a) is incorrect because it misidentifies the source of Vasopressin and Cortisol.

### Step 2: Understand the functions of Vasopressin and Cortisol
- **Vasopressin** primarily functions to promote water reabsorption in the kidneys, thereby reducing urine volume and helping maintain body fluid balance.
- **Cortisol** is involved in various functions including the regulation of metabolism, immune response, and it acts as a biomarker for stress. It also plays a role in maintaining cardiovascular function.

**Conclusion for Step 2**: The statement in option (b) is partially correct; while Vasopressin does stimulate reabsorption of water (not electrolytes specifically), Cortisol does contribute to cardiovascular maintenance.

### Step 3: Evaluate the relationship of Cortisol and RBC formation
- **Cortisol** does have a role in the formation of red blood cells (RBCs) indirectly by influencing the production of erythropoietin and other factors.
- **Vasopressin**, on the other hand, is primarily focused on reducing water loss and does not directly relate to RBC formation.

**Conclusion for Step 3**: The statement in option (c) is misleading; while it mentions RBC formation, it incorrectly associates it with Vasopressin.

### Step 4: Clarify the role of Vasopressin and Cortisol in the body
- **Vasopressin** is indeed an anti-diuretic hormone, which means it helps to conserve water in the body and reduce urine output.
- **Cortisol** is often referred to as a life-saving hormone due to its critical role in stress response and metabolic functions.

**Conclusion for Step 4**: The statement in option (d) is correct; Vasopressin is anti-diuretic and Cortisol is essential for life-saving functions.

### Final Conclusion
After analyzing all the options:
- Option (a) is incorrect.
- Option (b) is partially correct but misleading.
- Option (c) is misleading in its association.
- Option (d) is correct.

Thus, the correct answer is that option (a) is false, while options (b), (c), and (d) are true.