Cardio. L7 Flashcards
What are the body responses to haemorrhage
Vasoconstriction Increase in HR Blood clotting to stop BP from dropping Redirection Increase contractility to increase SV
What is the function of arterial baroreceptors?
respond to “stretch” and increases and decreases in BP and signals connect up to the brain via cranial nerves.
What part of the brain is responsible for cardiovascular system?
Cardiovascular (CV) center
What organ in the body which is a chemoreceptor located in the adventitia of the bifurcation of the common carotid artery and monitors the blood’s pH, pCO2, and pO2 and thereby modulates cardiovascular and respiratory function primarily through sympathetic tone.
carotid body
What are the inputs to cardiovascular center in the brain?
- From higher brain centers: cerebral cortex, limbic system, and hypothalamus
- From proprioceptors: monitor joint movements
- From baroreceptors: monitor BP
- From chemoreceptors: monitor blood acidity( pH), CO2, and O2
What are the inputs to cardiovascular center in the brain?
- From higher brain centers: cerebral cortex, limbic system, and hypothalamus
- From proprioceptors: monitor joint movements
- From baroreceptors: monitor BP
- From chemoreceptors: monitor blood acidity( pH), CO2, and O2
What are the nerves that come out of the cardiovascular center?
Vagus nerves( parasympathetic)-> decreased HR Cardiac accelerator( sympathetic)-> increased rate and contractility Vasomotor nerves( sympathetic)-> vasoconstriction
What is tonicity
baroreceptors can respond to increase and decrease in BP
It can either increase the rate of firing of the sympathetic neuron and constrict blood vessels to increase BP or decrease the rate of firing to dilate the blood vessel
Baroreceptors sense the change in BP-> send signals to adjust sympathetic acitivity
where are baroreceptors located?
carotid arteries and aortic arch
baroreflex response to haemorrhage
increased HR, TPR(total peripheral resistance), VR-> increased BP
what is the formula for BP?
BP= CO x TPR
what hormones trigger vasoconstriction?
angiotensin 2, antidiuretic hormone(ADH), norepinephrine, epinephrine
what hormones trigger vasodilation?
atrial natriuretic peptide(ANP), epinephrine, nitrile oxide
