Question

if you stimulate the beta receptors, total peripheral resistance will _________, heart rate will_________, contractility will ______, and cardiac output will___________

Answer 1

Stimulation of beta receptors leads to decreased total peripheral resistance, increased heart rate, increased contractility, and increased cardiac output, due to the activation of the sympathetic nervous system and release of adrenaline like substances.

Step-by-step explanation:

When beta receptors are stimulated, there are several physiological responses that occur as the body activates the sympathetic nervous system. Stimulation of the beta-1 adrenergic receptor, which is primarily found in the heart, leads to an

• increased heart rate (tachycardia)
• increased contractility (the strength of the heart's contractions)
• increased cardiac output (the volume of blood pumped by the heart per minute)

This happens because the beta-1 receptor, when activated, triggers the release of norepinephrine and epinephrine which in turn enhance the heart's performance. On the other hand, stimulation of beta-2 receptors, found in the blood vessels, leads to vasodilation and thus a decrease in total peripheral resistance.

In summary, the stimulation of beta receptors will:

1. Decrease total peripheral resistance
2. Increase heart rate
3. Increase contractility
4. Increase cardiac output