Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 39m
3. Energy & Cell Processes10h 8m
4. Tissues & Histology10h 3m
5. Integumentary System2h 28m
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 System3h 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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Multiple Choice

The cardiac cycle includes all of the following events EXCEPT __________.

the changes in blood volume in all chambers of the heart

the number of times the heart beats in one minute

the changes in pressure gradients in all chambers of the heart

the movement of impulse from the SA node to all regions of the heart wall

the closing and opening of the heart valves during each heartbeat

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Verified step by step guidance

Understand the components of the cardiac cycle: The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the beginning of the next. It includes the contraction and relaxation of the atria and ventricles, changes in blood volume and pressure, and the opening and closing of heart valves.

Identify the events included in the cardiac cycle: The cardiac cycle involves changes in blood volume and pressure in the heart chambers, the movement of electrical impulses from the SA node through the heart, and the opening and closing of heart valves.

Recognize what is not part of the cardiac cycle: The cardiac cycle does not include the number of times the heart beats in one minute, which is referred to as the heart rate. Heart rate is a measure of how often the cardiac cycle occurs, not an event within the cycle itself.

Differentiate between heart rate and cardiac cycle events: Heart rate is the frequency of the cardiac cycle, typically measured in beats per minute (bpm), while the cardiac cycle itself consists of the mechanical and electrical events occurring during a single heartbeat.

Conclude which option is not part of the cardiac cycle: Based on the understanding that heart rate is not an event within the cardiac cycle, identify that 'the number of times the heart beats in one minute' is the correct answer to the question.