Low blood pressure inhibits baroreceptors, leading the cardiac and vasomotor centers to increase heart rate and force of contraction (cardiac center) and cause vasoconstriction (vasomotor center), thereby increasing blood pressure.
1. Decreased BP inhibits baroreceptors in carotid sinus and aortic arch 2. Baroreceptor input to the cardiac center and vasomotor center is reduced 3. Vasomotor center triggers vasoconstrictor 4. Cardiac center increases sympathetic input to heart which increases HR and force of contraction 5. Net result: blood volume is increased and vascular resistance is increased 6. BP back to normal <img src="paste-83803de519a19f9acd08cfbe6e75e3873e60ae03.jpg">
| Front | What occurs as a response to low BP? |
|---|---|
| Back | 1. Decreased BP inhibits baroreceptors in carotid sinus and aortic arch 2. Baroreceptor input to the cardiac center and vasomotor center is reduced 3. Vasomotor center triggers vasoconstrictor 4. Cardiac center increases sympathetic input to heart which increases HR and force of contraction 5. Net result: blood volume is increased and vascular resistance is increased 6. BP back to normal |
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