Compare the effects of the cardioacceleratory and cardioinhibitory centers on cardiac output and blood pressure.

검증된 단계별 안내

Step 1: Understand the roles of the cardioacceleratory and cardioinhibitory centers. The cardioacceleratory center increases heart rate and contractility, while the cardioinhibitory center decreases heart rate.

Step 2: Recall that cardiac output (CO) is calculated by the formula \(CO = HR \times SV\), where \(HR\) is heart rate and \(SV\) is stroke volume. Changes in heart rate directly affect cardiac output.

Step 3: Analyze how the cardioacceleratory center affects cardiac output and blood pressure. By increasing heart rate and contractility, it increases stroke volume and cardiac output, which typically raises blood pressure.

Step 4: Analyze how the cardioinhibitory center affects cardiac output and blood pressure. By decreasing heart rate, it reduces cardiac output, which generally lowers blood pressure.

Step 5: Summarize the comparison: the cardioacceleratory center elevates cardiac output and blood pressure through sympathetic stimulation, whereas the cardioinhibitory center reduces cardiac output and blood pressure via parasympathetic stimulation.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Cardioacceleratory Center

The cardioacceleratory center is a region in the medulla oblongata that increases heart rate and force of contraction by stimulating the sympathetic nervous system. This leads to an increase in cardiac output, which raises blood pressure by pumping more blood per minute through the circulatory system.

Cardioinhibitory Center

The cardioinhibitory center, also located in the medulla oblongata, decreases heart rate by activating the parasympathetic nervous system via the vagus nerve. This reduction in heart rate lowers cardiac output, which can decrease blood pressure by reducing the volume of blood pumped by the heart.

Cardiac Output and Blood Pressure Relationship

Cardiac output is the volume of blood the heart pumps per minute, directly influencing blood pressure. An increase in cardiac output raises blood pressure, while a decrease lowers it. Both the cardioacceleratory and cardioinhibitory centers regulate this balance through autonomic nervous system control.