Inter-atrial septum in the human heart is:
1. | a thin muscular wall | 2. | a thick muscular wall |
3. | a thin membranous wall | 4. | a thick membranous wall |
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All vertebrates posses a:
1. muscular chambered heart | 2. renal portal system |
3. nucleated RBC | 4. double circulation |
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Match each item in Column I with one in Column II and select the correct answer from the codes given:
COLUMN I | COLUMN II | ||
A. | Mitral valve | a. | Allows blood flow from left atrium to left ventricle |
B. | Papillary muscles | b. | Does not allow back opening of AV valves during ventricular systole |
C. | AV node | c. | Ensure all chambers do not contract simultaneously |
D. | Fibrous band between atrial and ventricular muscle mass | d. | Ensures atria contract before ventricles |
Codes
A | B | C | D | |
1. | a | b | c | d |
2. | b | a | c | d |
3. | b | a | d | c |
4. | a | b | d | c |
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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 |
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Purkinje fibers are:
1. | Intrinsic neural fibers in the ventricles |
2. | Muscle fibers that interconnect SA node and AV node |
3. | Muscle fibers that are distributed in the ventricular musculature |
4. | Neural fibers that spread the impulse throughout the ventricular muscle mass |
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Statement I: | A carries oxygenated blood and B carries deoxygenated blood. |
Statement II: | D and C close simultaneously during the beginning of ventricular diastole. |
Statement III: | E and F close simultaneously during the beginning of ventricular systole. |
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I: | A is the normal pacemaker of the human heart and B is the pace-setter of the human heart. |
II: | While A is made up of muscle tissue, B is made up of neural tissue. |
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The chamber with the thickest musculature in the human heart would be:
1. the right atrium | 2. the left atrium |
3. the left ventricle | 4. the right ventricle |
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. |
A four chambered heart is not seen in:
1. | Amphibians | 2. | Crocodiles |
3. | Birds | 4. | Mammals |
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