Theme 25 - Cardio 2 Flashcards
(53 cards)
What does the heart (a pump) generate?
flow and pressure
What are the differences between right and left ventricle in size?
- right is thinly lined for lower pressure
- not side to side
- right is squished
What do the atrial/ventrical and pulmonary and aortic outflow valves depend on?
pressure gradient
What is a cardiac pacemaker?
a group of specialized muscle calls which control flow in the heart SA node
What does the SA node do?
muscle cells generate electrical signal that controls the heart (pacemaker)
What does parasympathetic information do to heart rate?
slow it down
What type of neural input slows heart rate down?
parasympathetic
What does sympathetic information do to heart rate?
speeds it up
What type of neural input speeds heart rate up?
sympathetic
What is rhythm in the heart maintained by?
SA node - pacemaker
What are electrically interconnected syncytium formed by?
cardiac muscle cells
what is atrial depolarization and contraction of the muscle caused by?
neural impulse travels through atrial muscle fibers
what is deposited into muscle fibers to make them contract?
calcium
What do t waves and p waves mean in the ECG?
pwave = atrial depolarization twave = ventricular repolarization
What does PVC stand for?
premature ventrical contractions
What does PAC stand for?
premature atrial contractions
what is an abnormal heart conduction called?
a heart block
What are 4 heart blocks?
first degree block
second degree block
bundle branch
third degree
What does pressure coming back from the veins (venous pressure) cause?
blood to enter the ventricles
what does plaque cause?
bigger pulse pressure
what do big pressure pulses cause?
aortic anerism
Why does the mitral valve close?
so that flow doesnt go backwards
What is cardiac contraction?
myogenic - intrinsic property of cardiac muscle cells
What does the heart (a pump) generate?
flow and pressure
