Identify the correct statement regarding the cardiac muscle:
1. Cardiac muscle does not have sarcoplasmic reticulum.
2. Cardiac muscle has a plateau phase in repolarization called the plateau phase.
3. Cardiac muscle has a shorter refractory period than skeletal muscle.
4. Depolarization of cardiac muscle occurs when K+ and Na+ diffuse into the cell.

Subtopic:  Human Heart: Cardiac Cycle |

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A slower heart rate or bradycardia would most likely be the result of:
1. ectopic action potentials in the atria
2. damage to the tricuspid valve
3. excessive sympathetic stimulation
4. excessive parasympathetic stimulation

Subtopic:  Human Heart: Cardiac Cycle |
 67%

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The location of the human heart is most accurately described as:

1. mediastinum of the lungs.
2. mediastinum of the pericardium.
3. mediastinum, which is located in the thoracic cavity.
4. thoracic cavity, which is located in the mediastinum.
Subtopic:  Human Heart: Gross Anatomy |
 65%

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Pericardial fluid is the serous fluid secreted by the serous layer of the pericardium into the pericardial cavity and it serves to:
1. reduce friction between the pericardial membranes.
2. lubricate the heart valves.
3. replace any blood that is lost.
4. provide oxygen and nutrients to the endocardium.

Subtopic:  Human Heart: Gross Anatomy |
 86%

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All cardiac veins empty into the ______, which then empties into the ______.
1. coronary sinus; left atrium
2. coronary sinus; right atrium
3. great cardiac vein; right atrium
4. great cardiac vein; left atrium

Subtopic:  Human Heart: Double Circulation |
 62%

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The right ventricle of the heart pumps blood into the:

 
1. pulmonary circulation 2. systemic circulation
3. coronary circulation 4. portal circulation
Subtopic:  Human Heart: Double Circulation |
 83%
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What exactly is an auricle?
1. a sphincter present in an arteriole.
2. an extension of the atrial wall.
3. part of a heart valve.
4. part of nodal tissue of the heart.

Subtopic:  Human Heart: Gross Anatomy |
 61%

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A thrombus in the pulmonary trunk would interfere with blood:
1. being distributed to the systemic circulation.
2. picking up oxygen in the lungs.
3. getting into the right atrium.
4. leaving the left ventricle.

Subtopic:  Human Heart: Double Circulation |
 55%

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What separates the atria from the ventricles so that the atrial impulse does not spill onto the ventricles?

1. fibrous skeleton 2. AV bundle
3. visceral pericardium 4. Purkinje fibers
Subtopic:  Human Heart: Gross Anatomy |
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If the atrioventricular node is damaged:
1. SA node would not develop action potential
2. atria will fail to contract
3. the impulse will not reach AV node
4. the impulse will not reach ventricles

Subtopic:  Human Heart: Cardiac Cycle |
 70%
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