Which of the following is true about Hypovolemia?
(a) It causes thirst
(b) It increases the blood pressure
(c) Angiotensin is released during this condition
(d) The volume of blood increases
(e) Blood pressure reduces 

Choose the correct answer from the options given below:

Correct option is B

The correct answer is A, C and E only.
1. Hypovolemia refers to a condition characterized by a decrease in blood volume, particularly plasma volume. It typically results from blood loss, dehydration, or fluid imbalance.
2. Thirst (A) is a major symptom of hypovolemia, as the body attempts to correct the fluid deficit. The hypothalamus detects changes in blood volume and osmolarity and stimulates thirst to promote fluid intake.
3. During hypovolemia, the renin-angiotensin-aldosterone system (RAAS) is activated. As part of this system, angiotensin (C) is released to constrict blood vessels and stimulate aldosterone release, helping to conserve water and sodium.
4. Blood pressure reduces (E) due to the decreased volume of circulating blood, which reduces the pressure exerted on vessel walls.

Information Booster

1. Definition:
1.1 Hypovolemia means a low volume of blood plasma, often due to dehydration, hemorrhage, vomiting, or excessive sweating.

2. Key Physiological Responses:
2.1 Thirst Mechanism (A): Triggered by osmoreceptors and baroreceptors, signaling the hypothalamus to initiate water-seeking behavior.
2.2 Angiotensin Release (C): The kidneys detect low blood volume and release renin, which activates the angiotensin system to constrict blood vessels and raise blood pressure.
2.3 Drop in Blood Pressure (E): A lower blood volume leads to reduced cardiac output and hence a fall in systemic blood pressure.

3. Associated Hormonal Responses:
3.1 Release of aldosterone to conserve sodium.
3.2 Secretion of ADH (vasopressin) to conserve water and raise blood volume.

4. Clinical Signs:
4.1 Dizziness, fainting, low urine output, and increased heart rate may occur due to compensation for low volume and pressure.