Chat with AIExam 22: B: Physiology of the Cardiovascular System
Describe the passage of a normal impulse through the conduction systems of the heart.
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Answered by Examlex AI CopilotThe passage of a normal impulse through the conduction system of the heart begins in the sinoatrial (SA) node, located in the right atrium. The SA node generates an electrical signal that spreads through the atria, causing them to contract and push blood into the ventricles.
The electrical signal then travels to the atrioventricular (AV) node, where it is briefly delayed to allow the ventricles to fill with blood. From the AV node, the impulse travels down the bundle of His, which divides into the left and right bundle branches, and then into the Purkinje fibers.
These fibers distribute the electrical signal throughout the ventricles, causing them to contract and pump blood out to the rest of the body. This coordinated sequence of electrical impulses ensures that the heart beats in a regular and efficient manner, allowing for proper circulation of blood throughout the body. Any disruption in this conduction system can lead to abnormal heart rhythms or arrhythmias.
The period between the filling of the ventricles and the opening of the semilunar valves is called:
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VerifiedB
What part of the heart should serve as the normal pacemaker?
(32) Answered by Examlex AI CopilotA: The normal pacemaker of the heart is the sinoatrial (SA) node. The SA node is a small group of cells located in the right atrium (upper chamber) of the heart. These cells are responsible for generating the electrical impulses that initiate each heartbeat. The SA node sets the pace for the heart rate, which is why it is often referred to as the heart's "natural pacemaker." The electrical signals produced by the SA node spread through the walls of the atria, causing them to contract and push blood into the ventricles. The impulses then travel to the atrioventricular (AV) node, which acts as a gatekeeper that slows the electrical signal before it enters the ventricles. This delay allows the ventricles to fill with blood before they contract. If the SA node fails to function properly, other parts of the heart's conduction system can take over as pacemakers, but they typically do so at a slower rate.
Which artery in the arm is used for measuring blood pressure?
(36) Which of the following most accurately describes what is measured by an electrocardiogram?
(37) Explain the primary principle of circulation as related to Newton's first and second laws of motion.
(42) The chemoreceptors in the carotid bodies are particularly sensitive to:
(26) The normal pattern of impulse conduction through the heart is:
(29) Which of the following is not a mechanism that increases blood volume and therefore venous return of blood to the heart?
(37) Match each part of the conduction system of the heart to the description of its location or function.
-bundles that carry impulses to the atrioventricular node
(26) The effect of what substance is to increase the total blood volume?
(41) Nicole records her resting heart rate at sea level.She then climbs a mountain.After reaching 18,000 feet,she stops and records her resting heart rate again.Predict what change,if any,would be observed,and then explain the mechanisms involved.
(26) Blood in the veins of which organ is not considered part of the "blood reservoir" system?
(32) Match each part of the conduction system of the heart to the description of its location or function.
-bundles that come from the atrioventricular node
(34) Which of the following arteries is not one of the six major pressure points used to stop arterial bleeding?
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