Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

18. The Heart

Cardiac Cycle

Anatomy & Physiology

18. The Heart

Cardiac Cycle

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Problem 14c

Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Tissue perfusion to the heart decreases during systole and increases during diastole.

Verified step by step guidance

Step 1: Understand the concept of tissue perfusion in the heart. Tissue perfusion refers to the flow of blood through the capillaries to supply oxygen and nutrients to tissues. In the heart, this process is influenced by the phases of the cardiac cycle: systole (contraction) and diastole (relaxation).

Step 2: Analyze the relationship between systole and coronary blood flow. During systole, the heart muscle contracts, compressing the coronary arteries and reducing blood flow to the heart tissue. This is why tissue perfusion to the heart decreases during systole.

Step 3: Examine the relationship between diastole and coronary blood flow. During diastole, the heart muscle relaxes, allowing the coronary arteries to open and blood flow to increase. This is why tissue perfusion to the heart increases during diastole.

Step 4: Evaluate the statement provided in the problem. The statement 'Tissue perfusion to the heart decreases during systole and increases during diastole' is true based on the physiological mechanisms described.

Step 5: If the statement were false, the correction would involve reversing the relationship between systole and diastole in terms of tissue perfusion. However, in this case, no correction is needed as the statement is accurate.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Cardiac Cycle

The cardiac cycle refers to the sequence of events that occur during one heartbeat, including systole (contraction) and diastole (relaxation) of the heart chambers. During systole, the heart pumps blood out, and during diastole, the heart fills with blood. Understanding this cycle is crucial for analyzing blood flow and perfusion to the heart.

Tissue Perfusion

Tissue perfusion is the process of delivering blood to the capillary beds in tissues, which is essential for providing oxygen and nutrients while removing waste products. Perfusion varies throughout the cardiac cycle, with different dynamics during systole and diastole, impacting how effectively the heart and other organs receive blood.

Coronary Blood Flow

Coronary blood flow refers to the circulation of blood in the blood vessels that supply the heart muscle (myocardium). It is primarily influenced by the phases of the cardiac cycle, with increased flow during diastole when the heart muscle is relaxed and the coronary arteries are not compressed, making the original statement about perfusion during systole and diastole false.

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Textbook Question

Karen is taking the medication verapamil, a drug that blocks the calcium channels in cardiac muscle cells. What effect should this medication have on Karen's stroke volume?

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Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

The amount of blood in the ventricles at the end of the ventricular filling phase is the end-systolic volume.

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Textbook Question

Mr. Watson has been diagnosed with mitral insufficiency, or a malfunctioning mitral valve, which causes the valve to not close properly. Predict the signs and symptoms you might expect from a disease of this valve. What would happen to the patient's stroke volume and cardiac output? Explain. What might help improve his cardiac output?

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Textbook Question

Two elements determine blood pressure—the cardiac output of the heart and the peripheral resistance, or friction, in the blood vessels. Name two factors that increase cardiac output. Name two factors that increase peripheral resistance.

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Multiple Choice

Which event of the cardiac cycle occurs when systolic blood pressure is measured?

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Multiple Choice

Which of the following statements is not true regarding ventricular systole?

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Multiple Choice

Which of the following is not true for ventricular systole?