In which choice are the components of the cardiac conduction system listed in the
CORRECT order in which they conduct the cardiac impulse?
-SA node, AV bundle, AV node, Purkinje fibers
-SA node, AV node, AV bundle, Purkinje fibers
-AV node, AV bundle, SA node, Purkinje fibers
-AV node, SA node, Purkinje fibers, AV bundle
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, SA node, AV node, AV bundle, Purkinje fibers
The heart valves
-contract to pump blood through the heart
-separate the left and right sides of the heart
-prevent blood from flowing backwards through the heart
-cause the heart sounds when they contract
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prevent blood from flowing backwards through the heart
Information about blood pressure is collected and sent to the brain by
-endothelial cells
-chemoreceptors
-baroreceptors
-osmoreceptors
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baroreceptors
Which of the following is a type of water soluble hormone?
-T3
-peptide hormone
-thyroid hormone
-steroid hormone
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, peptide hormone
If lines were drawn on a typical EKG recording showing where atrial and ventricular
systole begin and end, then the ventricular systole would be seen as beginning
during a ____ and ending during the next ____.
-P wave; QRS complex
-PR segment; T wave
-QRS complex; T wave
-T wave; P wave
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QRS complex; T wave
Which of these is NOT a steroid hormone?
-progesterone
-testosterone
-cortisol
-thyroid hormone
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-thyroid hormone
Which of the following would be an effect of cutting the vagus nerve?
-reduced heart rate
-increased heart rate
-reduced strength of contraction
-increased secretion of acetylcholine
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