ACBS 400B exam 1 ACTUAL exam: QUESTION AND
ANSWERS UPDATED 2025
Which of these is the oldest dog breed? - (ANSWER)Saluki
What layer of the blood vessel contains the endothelium? - (ANSWER)tunica
intima
What blood vessel feeds into the left atrium? - (ANSWER)Pulmonary viens
which node initiates the signal to the myocardial cells - (ANSWER)sinoatrial (SA)
which of these is the outermost layer of the pericardium - (ANSWER)parietal
pericardium
how fast is the heart rate of an active hummingbird - (ANSWER)1,200
What phase only has a K+ efflux - (ANSWER)phase 3
At what phase do Ca2+ currents stabilize the AP into a plateau - (ANSWER)Phase
2
what type of receptors are used for Ca2+ phosphorylation-dependent channels -
(ANSWER)Beta adrenergic receptors
,what ion initiates a fast response signal propagation - (ANSWER)Na
Which reptile has a 4 chambered heart instead of 3 chamber -
(ANSWER)croccodile
which lead is used for the ECG in snall animals - (ANSWER)Lead 2
What part of the ECG wave is associated with the depolarization of the atria -
(ANSWER)P wave
which of these happen due to increased sympathetic tone -
(ANSWER)tachycardia
which of these interrupts repolarization - (ANSWER)early afterpolarization
which animal has the slowest heartbeat - (ANSWER)blue whate 4-8 bpm
which of these is not a conduction black - (ANSWER)2nd degree SA node
(AV node blocks: 1, 2, mobitz 1/2, 3rd degree)
uni / bi directional
,What part of the vasculature contains the least amount of blood at any given time
- (ANSWER)capillaries
what muscle mechanism is associated with constant muscle length but increased
tension - (ANSWER)isometric
whihc of these animals has blue blood - (ANSWER)octopus
which part of the cardiac cycle is associated with the relaxation of the ventricles -
(ANSWER)isovolumetric relaxation
at what point in the cardiac cylce does blood flow from the atria to the ventricles -
(ANSWER)rapid filling
at peak systolic pressure, what is the pressure in the pulmonary artery -
(ANSWER)20-25mmHg
in the pressure-volume diagram, what point is associated with pressure increase
but no ejection - (ANSWER)Point 3
which of these causes an increase of end-diastolic volume - (ANSWER)Preload
How fast an a cheetahs heart go when it - (ANSWER)250 bpm
, which of these is associated with reduced contractility - (ANSWER)lusitropic
reserve
which adrenergic receptor is found on the heart - (ANSWER)Beta 1
which of these directly causes vasodilation - (ANSWER)nitric oxide
where does the parasympathetic nervous system innervate on the heart -
(ANSWER)atria
Which of these animals has the ability to regenerate its heart after injury -
(ANSWER)Zebra fish
which of these is the location of the sympathetic fibers in the spinal cord -
(ANSWER)intermediolateral cell column
what is made in the adrenal medulla - (ANSWER)norepinephrine
which of these activates angiotensin 1 - (ANSWER)renin
which of these causes vasoconstriction - (ANSWER)vasopressin
ANSWERS UPDATED 2025
Which of these is the oldest dog breed? - (ANSWER)Saluki
What layer of the blood vessel contains the endothelium? - (ANSWER)tunica
intima
What blood vessel feeds into the left atrium? - (ANSWER)Pulmonary viens
which node initiates the signal to the myocardial cells - (ANSWER)sinoatrial (SA)
which of these is the outermost layer of the pericardium - (ANSWER)parietal
pericardium
how fast is the heart rate of an active hummingbird - (ANSWER)1,200
What phase only has a K+ efflux - (ANSWER)phase 3
At what phase do Ca2+ currents stabilize the AP into a plateau - (ANSWER)Phase
2
what type of receptors are used for Ca2+ phosphorylation-dependent channels -
(ANSWER)Beta adrenergic receptors
,what ion initiates a fast response signal propagation - (ANSWER)Na
Which reptile has a 4 chambered heart instead of 3 chamber -
(ANSWER)croccodile
which lead is used for the ECG in snall animals - (ANSWER)Lead 2
What part of the ECG wave is associated with the depolarization of the atria -
(ANSWER)P wave
which of these happen due to increased sympathetic tone -
(ANSWER)tachycardia
which of these interrupts repolarization - (ANSWER)early afterpolarization
which animal has the slowest heartbeat - (ANSWER)blue whate 4-8 bpm
which of these is not a conduction black - (ANSWER)2nd degree SA node
(AV node blocks: 1, 2, mobitz 1/2, 3rd degree)
uni / bi directional
,What part of the vasculature contains the least amount of blood at any given time
- (ANSWER)capillaries
what muscle mechanism is associated with constant muscle length but increased
tension - (ANSWER)isometric
whihc of these animals has blue blood - (ANSWER)octopus
which part of the cardiac cycle is associated with the relaxation of the ventricles -
(ANSWER)isovolumetric relaxation
at what point in the cardiac cylce does blood flow from the atria to the ventricles -
(ANSWER)rapid filling
at peak systolic pressure, what is the pressure in the pulmonary artery -
(ANSWER)20-25mmHg
in the pressure-volume diagram, what point is associated with pressure increase
but no ejection - (ANSWER)Point 3
which of these causes an increase of end-diastolic volume - (ANSWER)Preload
How fast an a cheetahs heart go when it - (ANSWER)250 bpm
, which of these is associated with reduced contractility - (ANSWER)lusitropic
reserve
which adrenergic receptor is found on the heart - (ANSWER)Beta 1
which of these directly causes vasodilation - (ANSWER)nitric oxide
where does the parasympathetic nervous system innervate on the heart -
(ANSWER)atria
Which of these animals has the ability to regenerate its heart after injury -
(ANSWER)Zebra fish
which of these is the location of the sympathetic fibers in the spinal cord -
(ANSWER)intermediolateral cell column
what is made in the adrenal medulla - (ANSWER)norepinephrine
which of these activates angiotensin 1 - (ANSWER)renin
which of these causes vasoconstriction - (ANSWER)vasopressin
