In a normal mammalian cardiac cycle, ventricular systole begins when which valves close?
Correct answer: A. Atrioventricular valves
- A. Atrioventricular valves
- B. Semilunar valves
- C. Pulmonary veins
- D. Aortic branches
Explanation
Ventricular systole starts with ventricular contraction, which raises pressure and closes the atrioventricular valves. The semilunar valves open later, when ventricular pressure exceeds pressure in the pulmonary artery and aorta.
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Covers the gross and microscopic structure of domestic animals, including bones, joints, muscles, organs, blood vessels and nerves. It explains how the respiratory, cardiovascular, digestive, urinary, nervous, endocrine and reproductive systems function, with attention to species differences and the relationship between anatomical structure and physiological processes.
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