What is the main effect of sympathetic stimulation on the heart of a healthy domestic mammal?
Correct answer: A. Increased heart rate and contractility
- A. Increased heart rate and contractility
- B. Decreased heart rate
- C. Complete atrioventricular block
- D. Reduced ventricular filling
Explanation
Sympathetic stimulation increases heart rate, conduction, and myocardial contractility, helping raise cardiac output during stress or exercise. Parasympathetic activity has the contrasting effect of slowing cardiac rate, especially through the sinoatrial node.
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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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