BIOS 254 20-21 Exam - -The AV valves are supported by chordate tendin...

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BIOS 254 20-21 Exam

• Select the correct statement about the heart valves.

-The AV valves are supported by chordate tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.-The tricuspid valve divides the left atrium from the left ventricle.-The mitral valve separates the right atrium from the right ventricle.-Aortic and pulmonary valves control the flow of blood into the heart.–Answer The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur

• In the diagram, which labeled structure prevents blood flow from the right ventricle back

into the right atrium?-A -B -C -D -E –Answer B

• Which of the following factors does not influence heart rate?

-age -body temp -skin color -gender –Answer skin color

• Which of the following selections lists conditions that would lead to in- creased stroke

volume?-increased preload, increased after load, increased contractility -decreased preload, decreased after load, decreased contractility -increased preload, decreased after load, increased contractility -decreased preload, increased after load, increased contractility 1 / 4

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-increased preload, increased after load, decreased contractility –Answer increased preload, decreased after load, increased contractility

• In the diagram, which labeled structure is the circumflex branch of the left coronary

artery?-B -D -E -F -C –Answer D

• In comparison to a sedentary individual, a well-trained athlete will usually have the

following characteristics EXCEPT -a higher cardiac reserve -a higher resting cardiac output

-a higher stroke volume -hypertrophy of the heart -resting bradycardia –Answer a higher resting cardiac output

• Stimulation of this nerve reduces heart rate.

-Cardiac accelerator nerve -Hypoglossal nerve -Spinal accessory -Vagus nerve -Phrenic nerve –Answer Vagus nerve

• Which labeled structure in the fatigue in the figure is the AV node?

-A

-B 2 / 4

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-C -D -E –Answer B

• Isovolumetric contraction .

-Occurs immediately after the aortic and pulmonary valves close -Refers to the short period during ventricular systole when the ventricles are completely closed chambers -Occurs while the AV valves are open -Occurs only in people with heart valve defects –Answer refers to the short period during ventricular systole when the ventricles are completely closed chambers

• If cardiac muscle is deprived of its normal blood supply, damage would primarily

result from .-An inadequate supply of lactic acid -Decreased delivery of oxygen -A lack of nutrients to feed into metabolic pathways -A decrease in the number of available mitochondria for energy production –Answer - decreased delivery of oxygen

• Which of the following types of muscle contains the largest number of mitochondria

per cell?-Smooth muscle -Skeletal muscle -Cardiac muscle -All the muscle types contain approximately the same number -Mitochondria are not found in muscle cells –Answer Cardiac muscle 3 / 4

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• In the diagram, which labeled structure is the pulmonary semilunar valve?

-B -D

-E -A -None of these choices –Answer A

• During which of the following periods does the largest volume fo blood enter the

arteries?-Atrial diastole -Ventricular diastole -Atrial systole -Ventricular systole –Answer Ventricular systole

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

-AV valves are closed.-Blood enters pulmonary arteries and the aorta.-Ventricles are in systole.-Ventricles are in diastole.–Answer Ventricles are in diastole

• Which layer of the heart wall consists of mesothelium and connective tissue?

-Epicardium -Myocardium -Endocardium -Fibrous pericardium -None of the answer selections are correct –Answer Epicardium

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