Question

Bainbridge reflux causes?

• A. Bradycardia
• B. Increased cardiac output
• C. Decreased venous return
• D. Increased heart rate

Answer 1

The Correct Option is D

The Bainbridge reflex, also known as the atrial reflex, is a physiological mechanism that plays a crucial role in regulating heart rate. This reflex occurs in response to increased venous return, specifically when there is a rise in blood volume within the atria of the heart.

Here's how the Bainbridge reflex leads to an increased heart rate:

1. When venous return to the right atrium increases, this results in the stretching of the atrial walls.
2. The stretch receptors located in the atrial walls detect this change and send signals to the brain via the vagus nerve.
3. The brain processes these signals and responds by reducing vagal tone to the heart, thereby increasing sympathetic stimulation.
4. As a result, the heart rate increases. This mechanism helps to accommodate the increased blood volume by enhancing cardiac output.

Thus, considering the options presented, the correct answer is: Increased heart rate.