Week 2 Flashcards
Which system of the heart contracts the ventricles? (electrical impulse)
Purkinge fibers
Which valves are the semilunar valves?
- aortic valves
2. pulmonary valve
Where is the SA node located?
right atrium
What node sets the heart rate?
SA node
Is systole contraction or relaxation?
contraction
Is diastole contraction or relaxation?
relaxation
Coronary arteries branch off into the _____
aorta
What part of the heart drains deoxygenated blood to the right atrium?
coronary sinus (this is a vein not actually a sinus)
Do the valves flow one way or two ways?
one way
-ie the Mitra valve should just flow one way but that gets messed up with things like a mitravalve prolapse
Which side of the heart is thicker the left or the right?
Left ventricle (pumps blood to the whole body)
What does the fibrous skeleton do?
support valves and muscle cells
What does the fibrous skeleton do?
support valves and muscle cells
The AV valves (mitral valve and tricuspid valve) prevents back flow from the ________
ventricles into the atrium
The semilunar valves (pulmonary valve and aortic valve) prevent blood flow from ______
outflow vessels (aorta and pulmonary artery) back into the ventricles
What do the coronary arteries do?
provide oxygen and nutrients to the myocardium
What are the two types of cardiac cells the heartbeat needs?
- contractive cells (create the pumping)
1. conduction system cells (generate and spread the action potential)
The ______ system initiates and spread electrical impulses in the heart?
conducting system
What are the two types of cells in the conducting system?
- nodal cells- pacemaker cells that set the heart rate
2. conducting cells- send stimuli to myocardium
is stroke volume or cardiac output higher?
cardiac output (because it looks at 1 minute versus one beat_
stroke volume
amount of blood pumped in a single beat
cardiac output
amount of blood pumped each minute
does acetylcholine increase or decrease heart rate
decrees heart rate (parasympathetic)
does norepinephrine increase or decrease heart rate
increase
what part of the brain controls the heart
the medulla in the brain stem
