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5 Cards in this Set
- Front
- Back
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What is the mechanism of the Bainbridge reflex? How does it impact the heart? |
An increase in venous return stretches receptors in the wall of the right atrium; which sends vagal afferent signals to the cardiovascular center within the medulla (brain). The signal inhibits parasympathetic activity - which results in an increased HR. |
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Where are chemosensitive cells located? |
In the carotid bodies & aortic body |
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What occurs as a result of the Chemoreceptor reflex? |
Chemosensitive cells located in the carotid bodies & the aortic body respond to changes in pH status & blood oxygen tension |
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What is the Valsalva maneuver? How does it impact various components of the cardiopulmonary/circulatory system? |
Forced expiration against a closed glottis (holding your breath) produces increased intrathoracic pressure, increased central venous pressure & decreased venous return |
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How does the Valsalva maneuver impact the cardiac output & blood pressure of the heart? |
Decrease in cardiac output and blood pressure is sensed by baroreceptors, which reflexively increase HR & myocardial contractility through sympathetic stimulation |
