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 molecule on the thin filament has a binding site for calcium?

Actin

Myosin

Troponin

Tropomyosin

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Verified step by step guidance

Step 1: Begin by identifying the components of the thin filament in muscle fibers. The thin filament is primarily composed of actin, tropomyosin, and troponin.

Step 2: Understand the role of calcium in muscle contraction. Calcium ions bind to specific molecules on the thin filament to initiate the contraction process.

Step 3: Learn the function of troponin. Troponin is a regulatory protein complex that has three subunits: Troponin C (binds calcium), Troponin I (inhibits actin-myosin interaction), and Troponin T (binds tropomyosin).

Step 4: Recognize that Troponin C is the subunit responsible for binding calcium ions during muscle contraction. This binding causes a conformational change in the troponin-tropomyosin complex, exposing the binding sites on actin for myosin.

Step 5: Confirm that actin, myosin, and tropomyosin do not directly bind calcium. Actin is the structural protein, myosin is the motor protein, and tropomyosin regulates access to actin's binding sites. Troponin is the correct molecule with a binding site for calcium.