Hyperkalemia can cause cardiac arrest. In response to hyperkalemia, the hormone secreted by human body and the site of its action are respectively:
1. aldosterone; distal tubule
2. aldosterone; proximal convoluted tubule
3. ADH; cortical collecting duct
4. ADH; proximal convoluted tubule

Sodium is the principal cation in blood. If the blood concentration of sodium ions gets below normal:
1. blood volume increases and blood pressure decreases
2. water drains from the collecting duct
3. blood volume and blood pressure decrease
4. ADH secretion increases

Serum potassium concentrations are the most potent stimulator of secretion of:
1. Aldosterone
2. Angiotensin II
3. ADH
4. Atrial natriuretic hormone

Assertion: Angiotensin Converting Enzyme [ACE] inhibitors are widely used to treat hypertension.
Reason: Angiotensin II acts in several ways that increase blood pressure.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.