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

9. Muscle Tissue

Steps of Muscle Contraction

Anatomy & Physiology

9. Muscle Tissue

Steps of Muscle Contraction

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Multiple Choice

Voltage gated channels respond to the depolarization of an action potential by releasing Ca $^2$ $^+$ . Where are these channels located?

Sarcolemma.

Sarcoplasmic Reticulum.

Sarcomere.

T-Tubule.

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Verified step by step guidance

Understand the context: Voltage-gated channels are crucial in the process of muscle contraction, particularly in the release of calcium ions (Ca²⁺). These channels respond to changes in membrane potential during an action potential.

Identify the structures involved: The sarcolemma is the cell membrane of a muscle cell, the sarcoplasmic reticulum is an organelle that stores calcium ions, the sarcomere is the functional unit of muscle contraction, and T-tubules are invaginations of the sarcolemma that help propagate action potentials into the muscle cell.

Focus on the role of the sarcoplasmic reticulum: It is responsible for storing and releasing calcium ions in response to an action potential. Voltage-gated calcium channels are located on the sarcoplasmic reticulum, facilitating the release of Ca²⁺ into the cytoplasm.

Consider the function of T-tubules: They transmit the action potential deep into the muscle cell, but they do not directly release calcium ions. Instead, they help trigger the release from the sarcoplasmic reticulum.

Conclude that the correct location of the voltage-gated channels responsible for releasing Ca²⁺ during an action potential is the sarcoplasmic reticulum, as it is the site of calcium storage and release in muscle cells.