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

2. Cell Chemistry & Cell Components

Introduction to Eukaryotic Organelles

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Introduction to Eukaryotic Organelles

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Multiple Choice

Which of the following structures is a component of a myofibril in eukaryotic muscle cells?

Mitochondrion

Sarcomere

Nucleolus

Golgi apparatus

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Verified step by step guidance

Understand the context: Myofibrils are specialized structures found in eukaryotic muscle cells that are responsible for contraction. They are composed of repeating units called sarcomeres, which are the functional units of muscle contraction.

Eliminate unrelated options: Mitochondrion, nucleolus, and Golgi apparatus are organelles found in cells, but they are not components of myofibrils. Mitochondria are involved in energy production, the nucleolus is involved in ribosome synthesis, and the Golgi apparatus is involved in protein modification and transport.

Focus on the correct structure: Sarcomeres are the repeating units within myofibrils. They consist of organized arrangements of actin (thin filaments) and myosin (thick filaments), which interact during muscle contraction.

Recall the anatomy of a sarcomere: Sarcomeres are bordered by Z-discs, which anchor the actin filaments. The arrangement of actin and myosin creates the striated appearance of skeletal and cardiac muscle.

Conclude: The sarcomere is the correct answer because it is the structural and functional unit of a myofibril, directly involved in muscle contraction.