An extracellular recording of electrical activity of both autorhythmic and contractile cells of the heart is known as a(n)
  • increased contractility
  • Action potential
  • Einthoven's triangle
  • Electrocardiogram
how is the ventricular myocardium regulatided
  • electrical activity in the heart
  • decreased activity of the sympathetic nervous system
  • greater pressure in the aorta than in the left ventricle
  • the Beta receptors bind to epinephrine and norepinephrine
If blood pressure is increased at the arterial baroreceptors, what would happen with the activity level of the parasympathetic nervous system (PNS) and sympathetic nervous system (SNS)?
  • decreased stroke volume and no change in cardiac output
  • an increase in heart rate and contractility
  • decreased activity of the sympathetic nervous system
  • increased PNS activity and decreased SNS activity
Stimulation of the adrenal medulla would result in which of the following?
  • an increase in heart contractility
  • increased contractility
  • an increase in heart rate and contractility
  • increased heart rate and increased stroke volume
Put the phases of the cardiac cycle in the correct order, starting after ventricular filling.
  • the sum of the electrical activity of all cells in the heart
  • mean arterial pressure is proportional to cardiac output times Total peripheral resistance
  • isovolumetric contraction, ventricular ejection, isovolumetric relaxation
  • Most blood flows passively into the ventricles through open AV valves.
Contraction of the atria results from which wave of depolarization on the ECG tracing?
  • T wave
  • P wave
  • PR segment
  • QT interval
Which of the following is the effect of the parasympathetic nervous system when blood pressure is too high?A decrease heart rateB decrease force of contraction of the heartC reduce blood volumeD induce relaxation of arteriolar smooth muscle
  • norepinephrine, acetylcholine, epinephrine
  • blood vessel diameter, heart rate, force of cardiac contraction
  • atrial repolarization
  • A
Atrial depolarization__________
  • AV valves only
  • Q wave
  • P wave
  • AV node
Part completeWhich of the following statements best describes the electrical events recorded by an ECG?
  • blood vessel diameter, heart rate, force of cardiac contraction
  • the sum of the electrical activity of all cells in the heart
  • Pressure in the atria would be greater than the pressure in the ventricles.
  • decreased stroke volume and no change in cardiac output
Which of the following cardiovascular control factors contribute to changes in blood pressure?
  • Most blood flows passively into the ventricles through open AV valves.
  • blood vessel diameter, heart rate, force of cardiac contraction
  • decreased activity of the sympathetic nervous system
  • norepinephrine, acetylcholine, epinephrine
What does the QRS complex represent in the ECG wave tracing?
  • atrial repolarization
  • carotid sinus and aortic arch
  • ventricular depolarization
  • electrical activity in the heart
Which of the following would increase heart rate?
  • epinephrine and norepinephrine
  • atrial repolarization
  • electrical activity in the heart
  • increased heart rate and increased stroke volume
how is the SA node reulgated
  • alpah receptros which bind to norepinephrine and epinephrine
  • decreased stroke volume and no change in cardiac output
  • bete receptros that bind to epinephrine and norepinephrine and muscarinic receptors which bind to acetylcholine
  • the Beta receptors bind to epinephrine and norepinephrine
How would a decrease in blood volume affect both stroke volume and cardiac output?
  • increased PNS activity and decreased SNS activity
  • decreased stroke volume and no change in cardiac output
  • increased heart rate and increased stroke volume
  • alpah receptros which bind to norepinephrine and epinephrine
what is the equation for blood pressure
  • Most blood flows passively into the ventricles through open AV valves.
  • bete receptros that bind to epinephrine and norepinephrine and muscarinic receptors which bind to acetylcholine
  • mean arterial pressure is proportional to cardiac output times Total peripheral resistance
  • the Beta receptors bind to epinephrine and norepinephrine
Ventricular depolarization_____________
  • PR segment
  • T wave
  • QRS complex
  • ST segment
A decrease in blood pressure at the arterial baroreceptors would result in which of the following
  • carotid sinus and aortic arch
  • increased heart rate and increased stroke volume
  • an increase in heart contractility
  • increased PNS activity and decreased SNS activity
Which of the following neurotransmitters will play a role in the regulation of blood pressure by creating a change in cardiovascular function?
  • epinephrine and norepinephrine
  • decreased activity of the sympathetic nervous system
  • norepinephrine, acetylcholine, epinephrine
  • increased heart rate and increased stroke volume
Which of the following would increase cardiac output to the greatest extent?
  • increased heart rate and increased stroke volume
  • Most blood flows passively into the ventricles through open AV valves.
  • decreased activity of the sympathetic nervous system
  • norepinephrine, acetylcholine, epinephrine
how are arteriolar smooth muscle reglated
  • greater pressure in the aorta than in the left ventricle
  • blood vessel diameter, heart rate, force of cardiac contraction
  • alpah receptros which bind to norepinephrine and epinephrine
  • the Beta receptors bind to epinephrine and norepinephrine
How would an increase in the sympathetic nervous system increase stroke volume?
  • increased contractility
  • increased heart rate and increased stroke volume
  • decreased stroke volume and no change in cardiac output
  • an increase in heart contractility
A two electrode part constitutes a ________ which records the electrical activity of the heart
  • Q wave
  • QT interval
  • P wave
  • Lead
Which portion of a normal ECG represents ventricular depolarization?
  • PR segment
  • QRS complex
  • Most blood flows passively into the ventricles through open AV valves.
  • atrial repolarization
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