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- 1. Multiple Choice
Unless there is an influence on a cardiac muscle cell, it will depolarize approximately ________ times a minute.
100
80
50
30
- 2. Multiple Choice
All the statements concerning intrinsic conduction system cell depolarization are true except
they have a more negative resting membrane potential than the individual muscle cells.
they open rapid calcium channels to speed up repolarization.
they open fast sodium channels to make sure they depolarize rapidly.
they prevent potassium leakage from the cell in order to deolarize faster.
- 3. Multiple Choice
The primary reason humans have a heart is
to create adequate filtration.
to increase intestinal absorption.
to inhibit diffusion of nitrogenous wastes.
to create adequate oncotic pressure.
- 4. Multiple Choice
The best definition of an artery is it
carries blood away from the heart.
carries blood to the heart.
has oxygenated blood.
has deoxygenated blood.
- 5. Multiple Choice
The right ventricle sends blood to the
pulmonary trunk
aorta
pulmonary artery
pulmonary vein
- 6. Multiple Choice
The heart valves are all closed during
isovolumetric contraction.
atrial systole.
absolute refractory period.
ventricular ejection.
- 7. Multiple Choice
The heart valves are all closed during
isovolumetric relaxation
atrial systole.
absolute refractory period.
ventricular ejection.
- 8. Multiple Choice
The right atrio-ventricuilar valve
prevents blood from returning to the right atrium.
prevents blood from returning to the left atrium.
prevents blood from returning to the right ventricle.
prevents blood from returning to the left ventricle.
- 9. Multiple Choice
The left semilunar valve
prevents blood from returning to the right atrium.
prevents blood from returning to the left atrium.
prevents blood from returning to the right ventricle.
prevents blood from returning to the left ventricle.
- 10. Multiple Choice
All the statements concerning cardiac muscle cells are true except
they are individual cells held together by desmosomes.
they depolarize by allowing sodium to flow into the cell through a gap junction.
they are connected to an intrinsic conduction system.
they have fast calcium channels to contract quickly.
- 11. Multiple Choice
The intrinsic conduction system is made of
modified cardiac muscle cells that have no myofilaments.
modified neuron cell bodies.
axons of the parasympathetic nervous system.
modified cells of the fibrous skeleton.
- 12. Multiple Choice
The systemic circuit refers to
the chambers and vessels carrying blood to or from the lungs.
the chambers and vessels carrying blood to or from the body in general.
only oxygenated blood.
only deoxygenated blood.
- 13. Multiple Choice
The statements concerning the pericardial sac of the heart are all true except
it make pericardial fluid to reduce friction.
it seperates muscle fibers of the atria from the ventricle so electrical currents cannot pass.
it has a visceral layer called the epicardium.
it is a typical serosa.
- 14. Multiple Choice
The pulmonary circuit refers to
the chambers and vessels carrying blood to or from the lungs.
the chambers and vessels carrying blood to or from the body in general.
only oxygenated blood.
only deoxygenated blood.
- 15. Multiple Choice
The SL valves close because
the cordae tendinae pull them closed.
blood rushing back to the ventricles is caught in the little 'cups' of the valves and pushes the edges together.
the elastic artery pulls them closed.
the ventricles put more pressure on them than the artery.
- 16. Multiple Choice
All heart valves may be closed at the same time.
true
false
- 17. Multiple Choice
The SL valves close when
the ventricles relax enough that the pressure in the artery is higher.
the ventricles just begin to relax.
the atria begins to relax.
the AV node fires.
- 18. Multiple Choice
The aortic semilunar valve
prevents blood from returning to the right atrium.
prevents blood from returning to the left atrium.
prevents blood from returning to the right ventricle.
prevents blood from returning to the left ventricle.
- 19. Multiple Choice
The pulmonary semilunar valve
prevents blood from returning to the right atrium.
prevents blood from returning to the left atrium.
prevents blood from returning to the right ventricle.
prevents blood from returning to the left ventricle.
- 20. Multiple Choice
All heart valves may be open at the same time.
true
false
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