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Diastolic pressure is the pressure trough or low generated as the 1) superior vena cava contracts. 2) ventricles relax. 3) pulmonary artery recoils. 4) ventricles contract.

Ask by Wright Nichols. in the United States
Feb 20,2025

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Diastolic pressure occurs when the ventricles relax.

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To determine the correct answer regarding diastolic pressure, let's analyze the options provided: 1. **Superior vena cava contracts**: The superior vena cava is a large vein that carries deoxygenated blood from the upper body to the heart. Its contraction does not directly relate to diastolic pressure. 2. **Ventricles relax**: Diastolic pressure is defined as the pressure in the arteries when the heart ventricles are relaxed and filling with blood. This is the correct relationship. 3. **Pulmonary artery recoils**: While the pulmonary artery does have some elastic recoil, this is not the primary factor that defines diastolic pressure. 4. **Ventricles contract**: This refers to systolic pressure, which is the pressure in the arteries when the ventricles are contracting and pumping blood. Based on this analysis, the correct answer is: **2) ventricles relax.**

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Diastolic pressure is actually the result of the blood pressure in the arteries while the heart is at rest, specifically after the ventricles relax. This is the point where the heart refills with blood, allowing it to pump effectively in the next beat. When the ventricles relax, the pressure in the arteries decreases, resulting in the diastolic number you see in blood pressure readings. In practical terms, diastolic pressure helps gauge the resistance in the blood vessels and informs us about cardiovascular health. A normal diastolic pressure reading typically ranges from 60 to 80 mmHg. High diastolic pressure can indicate issues such as hypertension or other circulatory problems, and thus monitoring it is crucial for maintaining heart health!

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