blood pressure Flashcards
what is the pulse pressure
diff between diastolic pressure and systolic pressure
what does increase blood vol lead to?
incr. BP
where does vol. increase have the most and least influence and why?
most in arterioles, least in veins - compliance
what are 2 ways of compensating for inc. BP and speed
- cardiovasc. system - fast
2. kidneys - slow
what is pressure naturesis
more BP leads to more urine > lower volumes
what hormone do kidneys release to control vasc. resistance
angiotensin 2
what is mean systemic filling pressure (MFP)
pressure in vasc. system when heart stops
what determines mean systemic filling pressure (2)
- blood volume
2. compliance of veins
what part of vasc. system has biggest control over MFP
veins - high volume, high compliance
3 conditions associated with altered long term BP regulation
- hypertension
- hypotension
- shock
** 4 major contributors to means art. BP
- blood volume
- CO
- resistance in system
- relative distribution of blood volume
what is formula for pressure
flow*resisitance
what can we do to decrease total peripheral resitance
open up lots of caps. to make more tubes in parallel
3 intrinsic responses to rapid drop in TPR
- shift blood from A to Vein > increase vein P and decrease Art P
- higher P veing = more preload = more CO
- lower P art. = less afterload = more CO
4 conditions assoc. with TPR
- shock - blood loss trigger rapid TPR increase via vasoconstriction
- toxic shock - massive drop in TPR via vasodilation
- heat shock - drop in TPR via dilation
- hypertension -
