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 Heart2h 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

Which of the following is a difference between cardiac muscle and skeletal muscle?

Unlike skeletal muscle, cardiac muscle is not striated.

Unlike skeletal muscle cells, cardiac muscle cells do not rely on calcium ions for contraction.

Unlike skeletal muscle, cardiac muscle does not use a sliding filament mechanism for contraction.

Unlike skeletal muscle cells, cardiac muscle cells can be autorhythmic.

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Verified step by step guidance

Begin by understanding the basic structure and function of both cardiac and skeletal muscles. Cardiac muscle is found in the heart and is responsible for pumping blood, while skeletal muscle is attached to bones and is responsible for voluntary movements.

Recognize that both cardiac and skeletal muscles are striated, meaning they have a banded appearance due to the arrangement of actin and myosin filaments. This eliminates the option stating cardiac muscle is not striated.

Understand the role of calcium ions in muscle contraction. Both cardiac and skeletal muscle cells rely on calcium ions to initiate contraction through the sliding filament mechanism, which involves actin and myosin filaments sliding past each other.

Identify the sliding filament mechanism as a common feature in both muscle types, where actin and myosin filaments slide to produce contraction. This eliminates the option stating cardiac muscle does not use this mechanism.

Learn about autorhythmicity, which is a unique feature of cardiac muscle cells. Unlike skeletal muscle cells, cardiac muscle cells can generate their own electrical impulses without external stimulation, allowing the heart to beat rhythmically on its own.