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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Multiple Choice

Which of the following are considered events of the cardiac cycle?

Inhalation, exhalation, and gas exchange

Atrial systole, ventricular systole, and diastole

Depolarization, repolarization, and hyperpolarization

Filtration, reabsorption, and secretion

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Verified step by step guidance

Understand the cardiac cycle: The cardiac cycle refers to the sequence of events that occur in the heart during one heartbeat, including the contraction and relaxation of the atria and ventricles.

Identify the phases of the cardiac cycle: The main phases are atrial systole, ventricular systole, and diastole. Atrial systole is the contraction of the atria, ventricular systole is the contraction of the ventricles, and diastole is the relaxation phase where the heart fills with blood.

Differentiate between the options: Inhalation, exhalation, and gas exchange are related to the respiratory system, not the cardiac cycle. Depolarization, repolarization, and hyperpolarization are electrical events in neurons and muscle cells, including cardiac muscle, but they are not phases of the cardiac cycle. Filtration, reabsorption, and secretion are processes related to the kidneys and the urinary system.

Focus on the correct answer: Atrial systole, ventricular systole, and diastole are the correct events of the cardiac cycle, as they describe the mechanical actions of the heart during a heartbeat.

Summarize the cardiac cycle: The cardiac cycle is a coordinated sequence of atrial and ventricular contractions and relaxations that ensure efficient blood flow through the heart and to the rest of the body.