Heart rate and stroke volume are crucial factors determining cardiac output, the amount of blood the heart pumps per minute. Regulation of these variables involves a complex interplay of nervous and endocrine control mechanisms. The autonomic nervous system, with its sympathetic and parasympathetic branches, plays a significant role. Sympathetic stimulation increases heart rate and contractility, while parasympathetic stimulation slows heart rate. Hormones like epinephrine also influence heart function. Stroke volume, the amount of blood ejected with each beat, is affected by factors such as preload, afterload, and contractility.
Match the terms with their definitions:
| Term | Definition |
|---|---|
| 1. Stroke Volume | A. The volume of blood in the ventricles at the end of diastole (filling). |
| 2. Cardiac Output | B. The resistance the heart must overcome to eject blood. |
| 3. Preload | C. The amount of blood ejected by the heart with each beat. |
| 4. Afterload | D. The force of ventricular contraction. |
| 5. Contractility | E. The amount of blood pumped by the heart per minute. |
Answers: 1-C, 2-E, 3-A, 4-B, 5-D
Complete the following paragraph using the words provided (Sympathetic, Parasympathetic, Heart Rate, Stroke Volume, Cardiac Output).
The ________ nervous system increases ________ and ________, leading to a higher ________. The ________ nervous system, on the other hand, decreases heart rate.Answers: Sympathetic, Heart Rate, Stroke Volume, Cardiac Output, Parasympathetic
Explain how endurance training affects resting heart rate and stroke volume. What are the underlying physiological adaptations that lead to these changes?
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