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

Electrical Conduction System of the Heart

Anatomy & Physiology

18. The Heart

Electrical Conduction System of the Heart

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Multiple Choice

In the cardiac cycle, which chambers of the heart contract simultaneously?

The left atrium and left ventricle

The left and right atria

The left and right ventricles

The right atrium and right ventricle

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Verified step by step guidance

Understand the cardiac cycle: The cardiac cycle consists of a series of events that occur as the heart beats, including the contraction and relaxation of the heart chambers.

Identify the chambers of the heart: The heart has four chambers - two atria (left and right) and two ventricles (left and right).

Learn about the contraction sequence: During the cardiac cycle, the atria contract first, followed by the ventricles. This sequence ensures efficient blood flow through the heart and to the rest of the body.

Determine simultaneous contractions: The left and right atria contract simultaneously to push blood into the ventricles. After the atria contract, the left and right ventricles contract simultaneously to pump blood out of the heart.

Apply this knowledge to the problem: Based on the contraction sequence, the chambers that contract simultaneously are the left and right atria, followed by the simultaneous contraction of the left and right ventricles.