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

4. Tissues & Histology

Introduction to Muscle Tissue

Anatomy & Physiology

4. Tissues & Histology

Introduction to Muscle Tissue

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Multiple Choice

All muscle types will respond to an electrical stimulus because all muscle cells are _________.

involuntary

contractile

elastic

excitable

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Verified step by step guidance

Understand the key concept: Muscle cells respond to electrical stimuli because they possess a property called excitability. Excitability refers to the ability of a cell to respond to a stimulus, such as an electrical signal, by generating an action potential.

Review the definitions of the given options: 'Involuntary' refers to actions controlled by the autonomic nervous system, such as smooth and cardiac muscle movements. 'Contractile' refers to the ability of muscle cells to shorten and generate force. 'Elastic' refers to the ability of muscle cells to return to their original shape after being stretched. 'Excitable' refers to the ability to respond to stimuli by generating electrical signals.

Eliminate incorrect options: While muscle cells are contractile and elastic, these properties do not directly explain their ability to respond to electrical stimuli. Similarly, 'involuntary' applies only to certain muscle types (smooth and cardiac) and does not describe the universal property of all muscle cells.

Focus on the correct property: Excitability is the universal characteristic of all muscle cells that allows them to respond to electrical stimuli. This property is essential for muscle function, as it enables the generation of action potentials that lead to contraction.

Conclude the reasoning: Based on the definitions and elimination of incorrect options, the correct answer is 'excitable,' as it directly explains the ability of all muscle cells to respond to electrical stimuli.