The human heart is a fascinating organ, and it weighs about 12 ounces. The heart serves the purpose of pumping blood throughout the body and removing carbon dioxide in it. Do you think that you have what it takes to pass the cardiac physiology quiz? Why don’t you give it a shot and see if you need more revising time?
SA node
AV node
Bundle of His
Purkinje system
None of the above
Is composed of large round cells
Has many organelles
Develops from the embryonic right side
Has cells connected by gap junctions
All of the above
Increases LV contraction
Delays SA node activity so atria can empty
Relays SA signals to AV bundles
Located in the interatrial septum
All of the above
Higher body temp, lower rate
Higher body temp, higher rate
Composed of P cells
Composed of L cells
Both B and C
Divides at the interatrial septum
Is important in hypothalmic stimulation
Conducts signal from ventricles to atria
All of the above
None of the above
AVR
AV1
V2
V6
All of the above
Located on inner ventricular wall
Located on inner atrial wall
Located on outer atrial wall
All of the above
Both A and C
H channels and Ca++ L channels produce the prepotential
Ca++ L channels produce the impulse
C++ released from the mitochondria may be involved with the impulse
B channels and Ca++ T channels produce the prepotential
Ca++ L channels produce the prepotential
Sympathetic decreases frequency but keeps potential the same
Sympathetic increases frequency but changes potential
Vagal increases frequency and potential
None of the above
B and C
Binds with M1 receptors and leads to hyperpolarization
Binds with M1 receptors and leads to hypopolarization
Binds with M2 receptors and leads to hyperpolarization
Binds with M2 receptors but does not change polarization
Binds with M1 receptors but does not change polarization
Increases intracellular cAMP and slows Ca++ channel opening
Decreases intracellular cAMP and increases Ca++ channel opening
Increases intracellular cAMP and increases K+ channel opening
Decreases intracellular cAMP and decreases K+ channel opening
Decreases intracellular cAMP and decreases Ca++ channel opening
Decrease cAMP and increase ca++ L channel opening
Increase cAMP and decrease Ca++ L channel opening
Decrease cAMP and decrease Ca++ L channel opening
Increase cAMP and increase Ca++ L channel opening
Binds to B2 cholinergic receptors
Is the algebraic product of the action potentials
Is based on Einstein's triangle
Bipolar leads are a newer technology than unipolar leads
ALL OF THE ABOVE
NONE OF THE ABOVE
Bradycardia is a slowing due to vagal stim
Tachycardia is a speeding due to vagal stim
Normal SA node firing is 35/minute
Tachycardia is a slowing due to sympathetic stim
HR slows during inspiration
1st deg - not all impulses reach ventricle
1st deg - PR interval shortened
2nd deg - not all impulses reach ventricles
3rd deg - ventricles beat faster than atria
A, B and D