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

Centrally-acting muscle relaxants relieve muscle spasms and pain through which mechanism?

By directly inhibiting acetylcholine release at the neuromuscular junction

By increasing calcium release from the sarcoplasmic reticulum

By depressing activity in the central nervous system

By stimulating muscle fiber contraction

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Verified step by step guidance

Step 1: Understand the role of centrally-acting muscle relaxants. These drugs primarily work on the central nervous system (CNS) rather than directly targeting the muscles or neuromuscular junction.

Step 2: Review the mechanism of acetylcholine release at the neuromuscular junction. Centrally-acting muscle relaxants do not directly inhibit acetylcholine release; this mechanism is more relevant to drugs that act peripherally.

Step 3: Examine the role of calcium release from the sarcoplasmic reticulum in muscle contraction. Centrally-acting muscle relaxants do not increase calcium release; this mechanism is associated with muscle activation rather than relaxation.

Step 4: Focus on the CNS-depressing activity of these drugs. Centrally-acting muscle relaxants reduce the excitability of neurons in the CNS, leading to decreased muscle spasms and pain.

Step 5: Eliminate the option of stimulating muscle fiber contraction, as this would increase muscle activity rather than relax it. Centrally-acting muscle relaxants aim to reduce muscle activity by modulating CNS activity.