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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 statement best describes myofibrils in muscle tissue?

Myofibrils are the storage sites for calcium ions in muscle cells.

Myofibrils are the contractile units of muscle fibers composed of actin and myosin filaments.

Myofibrils are the connective tissue surrounding each muscle fiber.

Myofibrils are the energy-producing organelles within muscle cells.

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Verified step by step guidance

Begin by understanding the structure of muscle tissue. Muscle fibers are composed of smaller units called myofibrils, which are essential for muscle contraction.

Recognize that myofibrils are not storage sites for calcium ions. Calcium ions are stored in the sarcoplasmic reticulum, a specialized endoplasmic reticulum in muscle cells.

Identify the role of myofibrils as the contractile units within muscle fibers. They contain the proteins actin and myosin, which interact to produce muscle contraction.

Clarify that myofibrils are not connective tissue. Connective tissue surrounds muscle fibers but is not part of the myofibrils themselves.

Understand that myofibrils are not energy-producing organelles. Energy production occurs in mitochondria, which are separate organelles within muscle cells.