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41 terms

cardio vocabulary

cardo vocabulary
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arrhythmia
abnormal cardiac rhythm, time span between each beat is irregular
end systolic volume
is the volume of blood in each ventricle at the end of ventricular systole (amount of blood left in heart)
atrial systole
contraction of the atria
systolic blood pressure
is the pressure in the arteries during ventricular contraction
stroke volume
volume of blood pumped by a ventricle per beat/contraction
stroke volume determine by
1. preload
2. contractility
3. afterload
SA node
pacemaker because it determines heart rate
venous return
is the amount of blood returning to the heart via vena cavae
assistance from skeletal muscle, thoracic pump-breathing brings blood to the heart & valves
ventricular diastole
is relaxation of the ventricles
conduction system path
SA node---->AV node---->AV bundle---->bundle branches--->Purkinje fibers
baroreceptors
detect blood pressure in the aortic sinus and carotid sinus
help monitor and regulate blood pressure
chordae tendineae
function to prevent AV valves from opening under pressure
hydrostatic pressure
physical force exerted against a surface by a liquid
aka blood pressure
forces fluid out of the capillaries by filtration
hepatic portal vein
drains the organs of the digestive tract
precapillary sphincters function
in the control of the flow of blood into a capillary
osmotic pressure due to
albumin (plasma proteins)
capacitance vessels
veins
diastolic blood pressure
is the pressure in the arteries as the ventricles relax
p wave
SA node firing and wave of depolarization in the atria
QRS
ventricular depolarization and masks the atrial repolarization
T wave
ventricular repolarization
sympathetic nervous system increases
heart rate and contractility
peripheral resistance
aka afterload
resistance to blood flow due to diameter or blood vessels
blood pressure
is determined by the cardiac output and peripheral resistance
force and the amount of blood pumped
cardiac output
volume of blood pumped out by a ventricle each minute
= heart rate X stroke volume
end diastolic volume
(EDV) the volume of blood in each ventricle at the end of ventricular diastole (relaxation of ventricle)
contractility
is the force of contraction of the heart
autorhythmic
heart initiates its own heart rate
ectopic heart beat
is a beat that begins outside the SA node
preload
amount of blood in ventricles prior to contraction (volume)
-determined by EDV & Venous return
- if increase preload then increase force of contraction
afterload
resistance.
amount of resistance the ventricles must contract against
bradycardia
slow heart rate, less than 60
tachycardia
fast heart rate, over 100
fibrillation
you don't have meaningful rate
asystole
no contraction
PR interval
period of time the wave of depolarization is delayed in the AV node while the atria contract
ST segment
period of time between the depolarization of the ventricles and repolarization of ventricles. this is the time the ventricles are contracting
conduction system
was of depolarization
ducuts venosus
blood bypasses liver
ductus arteriosus
blood bypasses lungs by going from pulmonary trunk into aorta
foramen ovale
right atrium to left atrium
cardiac cycle
1. atrial systole
2. isovolumeteric ventricular contraction
3. ejection
4. isovolumetric ventricular relaxation
5. passive ventricular filling