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

Myofibrils are __________.

the plasma membrane of a muscle cell

organelles responsible for producing ATP in muscle cells

connective tissue layers surrounding muscles

rod-like structures composed of repeating sarcomeres within muscle fibers

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Verified step by step guidance

Understand the context: Myofibrils are structural components of muscle cells, so the question is asking about their specific role and structure within the muscle fiber.

Recall the anatomy of a muscle cell: Muscle fibers (muscle cells) contain myofibrils, which are long, rod-like structures that run parallel to the length of the cell.

Recognize the composition of myofibrils: Myofibrils are made up of repeating units called sarcomeres, which are the functional contractile units of muscle. Sarcomeres are composed of actin (thin filaments) and myosin (thick filaments).

Eliminate incorrect options: The plasma membrane of a muscle cell is called the sarcolemma, not myofibrils. Organelles responsible for producing ATP are mitochondria, and connective tissue layers surrounding muscles include the epimysium, perimysium, and endomysium.

Conclude the correct answer: Myofibrils are rod-like structures composed of repeating sarcomeres within muscle fibers, which aligns with the provided correct answer.