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

Which of the following correctly lists the sequence of events during the excitation of a skeletal muscle fiber?

Acetylcholine is released → Action potential arrives at the neuromuscular junction → Action potential is generated in the muscle fiber → Acetylcholine binds to receptors on the sarcolemma

Acetylcholine binds to receptors on the sarcolemma → Action potential arrives at the neuromuscular junction → Acetylcholine is released → Action potential is generated in the muscle fiber

Action potential is generated in the muscle fiber → Acetylcholine is released → Action potential arrives at the neuromuscular junction → Acetylcholine binds to receptors on the sarcolemma

Action potential arrives at the neuromuscular junction → Acetylcholine is released → Acetylcholine binds to receptors on the sarcolemma → Action potential is generated in the muscle fiber

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Verified step by step guidance

Step 1: Understand the sequence of events during skeletal muscle fiber excitation. This process involves communication between the nervous system and the muscle fiber at the neuromuscular junction.

Step 2: Recognize that the process begins with the arrival of an action potential at the neuromuscular junction. This electrical signal is transmitted from the motor neuron to the muscle fiber.

Step 3: Once the action potential reaches the neuromuscular junction, it triggers the release of acetylcholine (ACh), a neurotransmitter, from the synaptic vesicles in the motor neuron into the synaptic cleft.

Step 4: Acetylcholine then binds to specific receptors on the sarcolemma (the plasma membrane of the muscle fiber). This binding causes ion channels to open, leading to changes in the membrane potential.

Step 5: The change in membrane potential generates a new action potential in the muscle fiber, which initiates the contraction process. This sequence ensures proper communication and activation of the muscle fiber.