Exam 2: Lecture 23 Flashcards
What makes up the aortic arch and carotid sinus in cardiovascular reflexes
Baroreceptor reflex
What is the atrial stretch receptor reflex used for in cardiovascular reflexes
Brainbride reflex
Decreases PaO2 less than 50 mmHg or decreases pH senses by peripheral chemoreceptors causes a subsequent tachycardia and hypertension used for in cardiovascular reflexes
Chemoreceptor reflex
Pressure on the globe or traction on ocular muscles cause a decrease in heart rate used for in cardiovascular reflexes
oculocardiac reflex
What happens to the following during exercise
- HR
- stroke volume
- pulse pressure
- cardiac output
- venous return
- mean arterial pressure
- total peripheral resistance
- arteriovenous O2 difference
- HR increases
- stroke volume increases
- pulse pressure increases
- cardiac output increase
- venous return increase
- mean arterial pressure increase
- total peripheral resistance decrease
- arteriovenous O2 difference increases
What happens to the body during hemorrhage
decrease in total blood volume = decreases in atrial pressure + mean systemic pressure decreases and graph shift towards the left
decrease in venous return
decreases in RA pressure
What way does the graph shift during hemorrhage
towards the left
What is / are the compensatory responses during hemorrhage of the body
total peripheral resistance later during response
Mean atrial pressure increases gradually back towards normal
When atrial pressure decreases rapidly what is used as a response to attempt to return atrial pressure back to normal
compensatory responses
What happens during hemorrhage when there is a failure of compensatory responses
Mean aterial pressure decreases irrevesibly
- death
During exercise is there an increase in PNS and SNS which allows increase HR, increase contractility, increase CO, constriction of arterioles and decrease in unstressed volume leading to an increase in blood flow to skeletal muscle
increase in SNS outflow and a decrease in PNS outflow
During hemorrhage you have a decrease in mean arterial pressure what gets the SNS outflow to increases which allows for increase HR, increase contractility, increase CO, constriction of arterioles, increase in TPR and constriction of veins to cause an overall increase in mean aterial pressure towards normal
Baroreceptor refelx
During hemorrhage you have a decrease in mean arterial pressure what gets an increase in angiotensin II to cause an increase in TPR, increase in aldesterone, increase in NA reabsorption, and increase in blood flow to cause an overall increase in mean aterial pressure towards normal
Renin-angiotensis II - Aldesterone
