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

Each myofibril contains many ______, each extending from one Z line to the next.

sarcomeres

myofilaments

fascicles

muscle fibers

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Verified step by step guidance

Understand the structure of a muscle: Muscles are composed of bundles of fascicles, which are further divided into muscle fibers (cells). Each muscle fiber contains myofibrils, which are the contractile units of the muscle.

Recall that myofibrils are made up of repeating units called sarcomeres. Sarcomeres are the functional units of contraction in skeletal and cardiac muscle.

Visualize the structure of a sarcomere: It is the region between two Z lines (or Z discs). The Z lines serve as the boundaries of each sarcomere and anchor the thin filaments (actin).

Differentiate between the options: Sarcomeres are the repeating units within myofibrils. Myofilaments (actin and myosin) are the protein filaments within sarcomeres. Fascicles are bundles of muscle fibers, and muscle fibers are the cells themselves.

Conclude that the correct answer is 'sarcomeres,' as they are the repeating units within myofibrils, extending from one Z line to the next.