Cardiac system Flashcards
myocardium has what
2 ventricles and 2 atria
nerve supply is from where
both symp and parasymp of ANS
myocardium of which ventricle is thicker
left
cardiac vein will deliver blood to coronary sinus back to the
RA
double- walled sac is cmposed of
superficial fibrous pericardium
deep 2 layer serous persicardium
2 circuits if the heart
pulmonary
systemic
cardiac cycle phases
atrial diastole+systole
ventricular filling
ventricular systole
ventricular diastole
what is the pulse
surge of pressure in artery
Tachy
HR exceeds 100bpm
Bradycardia
HR less than 60bpm
Co=
HR*SV
Ejection fraction
% of EDV pumped by ventricle
blood preassure is
force exerted by blood against blood vessel wall
inc BP
blood volume increases
HR increases
SV increases
after-load
load that pre-load muscle has to work against
factors whcih affect after-load
pre-load
what is frank-starling mechanism:
change heart force in response to chance in venous return
increasing contractile will increase what
CO
Increased HR can cause what
increased CO
hypertension is when the ……… pressure is too high
atrial
how do you treat hypertension
lifestyle
drug therapy
Ca2+ channel blockers
what will ACE convert
angiotensin 1 to angiotensin 2
use ACE inhibitors
inhibit formation of angiotensin
decreases the release of aldestrone
cardiomyocyte membrane potential
resting potential=K equilibrium potential
phase 0 of action potential:
……….. depolarasisation
membrane potential rise to ….. to …..
na gates are ………. and na permeability falls
rapid
+20
+30
inactivated
phase 1 of action potential:
initial …………
stimulate ….. of …. Type voltage gated Ca2+ ……..
repolaristion
open
L
channels
phase 2 of action potential:
………. phase
…… balances ……… flow
plateu
K
Ca
phase 3 of action potential:
……………
K channel remain ………..
re polarisation
open
phase 4 of action potential:
……………..
resting potential
in an electrocardiogram what does the P wave represent
depolarise Atrial myocardium
in an electrocardiogram what dos the QRS complex show
ventricular depolarasiaion
in an electrocardiogram what does the T wave show
repolarsiation of the ventricles
