Heart: Exam 1

36 Questions | Attempts: 182
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  • 1/36 Questions

    Which of the following factors does not influence heart rate?

    • Gender
    • Body temperature
    • Age
    • Skin color
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Heart: Exam 1 - Quiz
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  • 2. 

    The P wave of a normal electrocardiogram indicates _____________________________.

    • Atrial depolarization

    • Atrial re-polarization

    • Ventricular depolarization

    • Ventricular re-polarization

    Correct Answer
    A. Atrial depolarization
  • 3. 

    The left ventricular wall of the heart is thicker than the right wall in order to ___________________________.

    • Expand the thoracic cage during diastole

    • Pump blood with great pressure

    • Pump blood through a smaller valve

    • Accommodate a great volume of blood

    Correct Answer
    A. Pump blood with great pressure
  • 4. 

    Select the correct statement about cardiac output.

    • A slow heart rate increases end diastolic volume, stroke volume, and force of contraction

    • Stoke volume increases if end diastolic volume decreases.

    • If a semilunar value were partially obstructed, the end systolic volume in the affected ventricle would be decreased.

    • Decreased venous return will result in increased end diastolic volume

    Correct Answer
    A. A slow heart rate increases end diastolic volume, stroke volume, and force of contraction
  • 5. 

    Which of these vessels receives blood during ventricular systole?

    • Both the aorta and pulmonary track

    • Pulmonary veins only

    • Aorta only

    • Pulmonary arteries only

    Correct Answer
    A. Both the aorta and pulmonary track
  • 6. 

    Compared to skeletal muscle, cardiac muscle ___________________________________.

    • Has gap junctions that allow it to act as a functional syncytium

    • Lacks striations

    • Has more nuclei per cell

    • Cells are larger than skeletal muscle cells

    Correct Answer
    A. Has gap junctions that allow it to act as a functional syncytium
  • 7. 

    If cardiac muscle is deprived of its normal blood supply, damage would primarily result from  __________________________.

    • A decrease in the number of available mitochondria for energy production

    • An inadequate supply of lactic acid

    • Decreased delivery of oxygen

    • A lack of nutrients to feed into metabolic pathways

    Correct Answer
    A. Decreased delivery of oxygen
  • 8. 

    Small muscle masses attached to the chordae tendineae are the _______________________

    • Venae cavae

    • Trabecular carneae

    • Pectinate muscles

    • Papillary muscles

    Correct Answer
    A. Papillary muscles
  • 9. 

    When viewing a dissected heart, it is easy to visually discern the right and left ventricles by ______________________.

    • Locating the apex

    • Finding the papillary muscles

    • Tracing out where the auricles connect

    • Noticing the thickness of the ventricle walls

    Correct Answer
    A. Noticing the thickness of the ventricle walls
  • 10. 

    The source of blood carried to capillaries in the myocardium would be the __________________________.

    • Coronary veins

    • Coronary sinus

    • Fossa ovalis

    • Coronary arteries

    Correct Answer
    A. Coronary arteries
  • 11. 

    Hemorrhage with a large loss of blood causes _________________________.

    • A rise in blood pressure due to change in cardiac output

    • A lowering of blood pressure due to change in cardiac output

    • No change in blood pressure but a slower heart rate

    • No change in blood pressure but a change in respiration

    Correct Answer
    A. A lowering of blood pressure due to change in cardiac output
  • 12. 

    Damage to the __________________ is referred to as heart block.

    • AV valves

    • SA node

    • AV node

    • AV bundle

    Correct Answer
    A. AV node
  • 13. 

    The second heart sound is heard during which phase of the cardiac cycle?

    • Isovolumetric contraction

    • Ventricular ejection

    • Isovolumetric relaxation

    • Ventricular filling

    Correct Answer
    A. Isovolumetric relaxation
  • 14. 

    The fact that the left ventricle of the heart is thicker than the right ventricle reveals that it _________________________.

    • Expands the thoracic cage

    • Pumps blood against a greater resistance

    • Sends blood through a smaller valve

    • Pumps a greater volume of blood

    Correct Answer
    A. Pumps blood against a greater resistance
  • 15. 

    The term for pain associated with deficient blood delivery to the heart that may be caused by the transient spasm of coronary arteries is __________________________.

    • Ischemia

    • Myocardial infarct

    • Angina pectoris

    • Pericarditis

    Correct Answer
    A. Angina pectoris
  • 16. 

    The time of day most hazardous for heart attacks is ________________.

    • Morning

    • Noontime

    • Evening

    • During sleep

    Correct Answer
    A. Morning
  • 17. 

    Select the correct statement about the heart valves.

    • Aortic and pulmonary valves control the flow of blood into the heart

    • The tricuspid valve divides the left atrium from the left ventricle

    • The mitral valve separates the right atrium from the right ventricle

    • The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur

    Correct Answer
    A. The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur
  • 18. 

    Which of the following is not an age-related change affecting the heart?

    • Atherosclerosis

    • Decline in cardiac reserve

    • Fibrosis of cardiac muscle

    • Thinning of the valve flaps

    Correct Answer
    A. Thinning of the valve flaps
  • 19. 

    During the period of ventricular filling ______________________________________.

    • The atria remain in diastole.

    • It is represented by the P wave on the ECG

    • Blood flows passively through the atria and the open AV valves into the ventricles

    • Pressure in the heart is at its peak

    Correct Answer
    A. Blood flows passively through the atria and the open AV valves into the ventricles
  • 20. 

    Which vessel of the heart receives blood during right ventricular systole?

    • Aorta

    • Venae cavae

    • Pulmonary veins

    • Pulmonary trunk

    Correct Answer
    A. Pulmonary trunk
  • 21. 

    If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells _______________________.

    • Tetanic contractions might occur, which would stop the heart's pumping action

    • It would be less than 1--2 ms

    • It would be much longer before cardiac cells could respond to a second stimulation

    • Contractions would last as long as the refractory period

    Correct Answer
    A. Tetanic contractions might occur, which would stop the heart's pumping action
  • 22. 

    During contraction of heart muscle cells _________________________________.

    • Some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores

    • Calcium is prevented from entering cardiac fibers that have been stimulated

    • The action potential is prevented from spreading from cell to cell by gap junctions

    • The action potential is initiated by voltage-gated slow calcium channels

    Correct Answer
    A. Some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores
  • 23. 

    Norepinephrine acts on the heart by __________________________

    • Decreasing heart contractility

    • Blocking the action of calcium

    • Causing a decrease in stroke volume

    • Causing threshold to be reached more quickly

    Correct Answer
    A. Causing threshold to be reached more quickly
  • 24. 

    If the vagal nerves to the heart were cut, the result would be that ____________________________

    • Parasympathetic stimulation would increase, causing a decrease in heart rate

    • The heart rate would increase by about 25 beats per minute

    • The heart would stop, since the vagal nerves trigger the heart to contract

    • The AV node would become the pacemaker of the heart

    Correct Answer
    A. The heart rate would increase by about 25 beats per minute
  • 25. 

    To auscultate the aortic semilunar valve, you would place your stethoscope in the ___________________________.

    • Fifth intercostal space inferior to the left nipple

    • Second intercostal space to the right of the sternum

    • Second intercostal space to the left of the sternum

    • Fifth right intercostal space

    Correct Answer
    A. Second intercostal space to the right of the sternum
  • 26. 

    Normal heart sounds are caused by which of the following events?

    • Closure of the heart valves

    • Opening and closing of the heart valves

    • Friction of blood against the chamber walls

    • Excitation of the SA node

    Correct Answer
    A. Closure of the heart valves
  • 27. 

    Commotio cordis is heart failure due to a ___________________.

    • Severe electrical shock to the body

    • Mild electrical shock to the heart itself

    • Loss of blood from an artery

    • Relatively mild blow to the chest that occurs during a vulnerable interval (2 ms) when the heart is re-polarizing

    Correct Answer
    A. Relatively mild blow to the chest that occurs during a vulnerable interval (2 ms) when the heart is re-polarizing
  • 28. 

    Isovolumetric contraction ___________________________.

    • Refers to the short period during ventricular systole when the ventricles are completely closed chambers

    • Occurs immediately after the aortic and pulmonary valves close

    • Occurs only in people with heart valve defects

    • Occurs while the AV valves are open

    Correct Answer
    A. Refers to the short period during ventricular systole when the ventricles are completely closed chambers
  • 29. 

    Which of the following is not part of the conduction system of the heart?

    • AV node

    • AV valve

    • SA node

    • Bundle of His

    Correct Answer
    A. AV valve
  • 30. 

    Select the correct statement about the function of myocardial cells.

    • The entire heart contracts as a unit or it does not contract at all

    • Each cardiac muscle cell is innervated by a sympathetic nerve ending so that the nervous system can increase heart rate.

    • The influx of potassium ions from extracellular sources is the initiating event in cardiac muscle contraction

    • The refractory period in skeletal muscle is much longer than that in cardiac muscle

    Correct Answer
    A. The entire heart contracts as a unit or it does not contract at all
  • 31. 

    Select the correct statement about the structure of the heart wall.

    • The heart chambers are lined by the endomysium

    • The myocardium is the layer of the heart that actually contracts

    • Connective tissue in the heart wall aids in the conduction of the action potential

    • The fibrous skeleton forms the bulk of the heart

    Correct Answer
    A. The myocardium is the layer of the heart that actually contracts
  • 32. 

    The tricuspid valve is closed _________________________.

    • By the movement of blood from atrium to ventricle

    • While the ventricle is in diastole

    • While the atrium is contracting

    • When the ventricle is in systole

    Correct Answer
    A. When the ventricle is in systole
  • 33. 

    Blood within the pulmonary veins returns to the _________________.

    • Left atrium

    • Left ventricle

    • Right ventricle

    • Right atrium

    Correct Answer
    A. Left atrium
  • 34. 

    Foramen ovule _____________________________.

    • Connects the two atria in the fetal heart

    • Is a connection between the pulmonary trunk and the aorta in the fetus

    • Is a shallow depression in the inter ventricular septum

    • Is a condition in which the heart valves do not completely close

    Correct Answer
    A. Connects the two atria in the fetal heart
  • 35. 

    Which of the events below does not occur when the semilunar valves are open?

    • Ventricle are in systole

    • Blood enters pulmonary arteries and the aorta

    • Ventricles are in diastole

    • AV valves are closed

    Correct Answer
    A. Ventricles are in diastole
  • 36. 

    If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid, ________________________________________.

    • Heart rate would decrease, but blood pressure would rise due to the excess sodium present

    • Potassium channels compensate and no change in heart rate would occur

    • Threshold is reached more quickly and heart rate would increase

    • Tetanic contraction would occur due to the short absolute refractory period of cardiac muscle

    Correct Answer
    A. Threshold is reached more quickly and heart rate would increase

Quiz Review Timeline (Updated): Mar 19, 2022 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

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  • Mar 19, 2022
    Quiz Edited by
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  • Jan 26, 2018
    Quiz Created by
    Caitlynallison
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