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

The cardiac cycle includes all the events that occur during one complete ________.

circulation of blood through the lungs

contraction of the atria only

heartbeat

respiratory cycle

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Verified step by step guidance

Step 1: Understand the term 'cardiac cycle.' The cardiac cycle refers to all the events that occur during one complete heartbeat, including both systole (contraction) and diastole (relaxation) of the heart chambers.

Step 2: Break down the components of the cardiac cycle. It includes the contraction of the atria (atrial systole), the contraction of the ventricles (ventricular systole), and the relaxation phase (diastole) where the heart fills with blood.

Step 3: Compare the options provided in the problem. The cardiac cycle does not refer to the circulation of blood through the lungs (this is part of pulmonary circulation), nor does it refer to the contraction of the atria only (this is just one part of the cycle). It also does not relate to the respiratory cycle, which involves breathing.

Step 4: Identify the correct answer based on the definition of the cardiac cycle. The correct answer is 'heartbeat,' as the cardiac cycle encompasses all events during one complete heartbeat.

Step 5: Reinforce the concept by explaining that the cardiac cycle is essential for maintaining blood flow throughout the body and includes coordinated electrical and mechanical activities of the heart.