The Bainbridge reflex is designed to prevent overfilling by increasing heart rate in response to which condition?

The Bainbridge reflex is designed to prevent overfilling by increasing heart rate in response to which condition?

• A. Increased venous return.
• B. Decreased venous return.
• C. Increased arterial pressure.
• D. Decreased arterial pressure.

Answer: (A)

The Bainbridge reflex is triggered by increased venous return that stretches the walls of the right atrium. When more blood returns to the heart, atrial stretch receptors are activated and transmit signals to the autonomic nervous system to raise heart rate. This helps prevent overfilling by moving blood more quickly from the atria into the ventricles, maintaining steady flow and cardiac output. So, the condition that elicits this reflex is increased venous return.

The Bainbridge reflex is triggered by increased venous return that stretches the walls of the right atrium. When more blood returns to the heart, atrial stretch receptors are activated and transmit signals to the autonomic nervous system to raise heart rate. This helps prevent overfilling by moving blood more quickly from the atria into the ventricles, maintaining steady flow and cardiac output. So, the condition that elicits this reflex is increased venous return.