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

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which three proteins primarily make up the thin filaments of muscle myofibrils?

Actin, tropomyosin, and troponin

Troponin, myosin, and nebulin

Myosin, actin, and titin

Tropomyosin, myosin, and dystrophin

Previous problemNext problem

Verified step by step guidance

Step 1: Begin by understanding the structure of muscle myofibrils. Myofibrils are composed of repeating units called sarcomeres, which contain thin and thick filaments. Thin filaments are primarily involved in muscle contraction and are made up of specific proteins.

Step 2: Recall the three primary proteins that make up the thin filaments. These proteins are actin, tropomyosin, and troponin. Actin forms the backbone of the thin filament, tropomyosin regulates the binding sites on actin, and troponin is involved in calcium-mediated regulation of muscle contraction.

Step 3: Eliminate incorrect options by identifying proteins that are not part of the thin filaments. For example, myosin is a thick filament protein, titin is involved in sarcomere elasticity, nebulin stabilizes actin filaments, and dystrophin connects the cytoskeleton to the extracellular matrix.

Step 4: Match the correct combination of proteins to the thin filaments. The correct answer is actin, tropomyosin, and troponin, as these are the proteins that primarily make up the thin filaments.

Step 5: Confirm your understanding by reviewing the roles of actin, tropomyosin, and troponin in muscle contraction. Actin provides the structural framework, tropomyosin blocks or exposes binding sites, and troponin interacts with calcium to initiate contraction.