Cardiovascular System Flashcards
What does MAP stand for?
Mean arterial pressure
How do you calculate MAP?
Diastolic BP + 1/3(Systolic-diastolic BP)
How do you calculate cardiac output?
stroke volume x heart rate
What are 2 factors that influence cardiac output?
stroke volume and heart rate
What are 3 factors that influence vascular resistance?
size of the vessel lumen, vessel length, blood viscosity
What are 2 factors that influence MAP?
cardiac output and vascular resistance
What are baroreceptors?
pressure-sensitive sensory receptors that relay impulses to the brain
Where are the two places that baroreceptors live?
Aortic arch and carotid sinus
Where do baroreceptors communicate to?
Oblangata medulla and adrenal medulla
With a decrease in BP, would the negative feedback loop increase the parasympathetic or sympathetic system?
sympathetic
What are the three methods that capillary exchange uses to move nutrients/wastes
- diffusion (down concentration gradient)
- Transcytosis (exo and endo)
- Bulk flow
Is bulk flow a passive process?
Yes
What end of capillaries allows for net filtration?
aterial end (art uses filters)
Does net reabsorption mean flow in or out?
Flow in (venus end)
What does BHP stand for?
Blood hydrostatic pressure (pressure inside cap)
What does IFOP stand for?
Interstitial fluid osmotic fluid (particles pulling)
What does BCOP stand for?
Blood colloidal osmotic pressure (large molecules pulling)
What does IFHP stand for?
Interstitial fluid hydrostatic pressure (0)
What 2 types of pressure influence the arterial end of a cap?
BHP and IFOP
What 2 types of pressure influence the venus end of a cap?
BCOP and IFHP
What is meant by net filtration pressure?
summated difference between the pressure inside and outside cap
Define autoregulation
blood flow to the tissues despite changes in BP (ability to adjust blood flow to match demands)
Does a decrease in BP cause dilation or constriction to blood flow?
dilation
What are the 2 theories of autoregulation?
Myogenic and Metabolic
