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 Heart2h 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

9. Muscle Tissue

Steps of Muscle Contraction

Anatomy & Physiology

9. Muscle Tissue

Steps of Muscle Contraction

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Multiple Choice

Which of the following substances increases in quantity during repetitive muscle contraction during oxygen deficit?

adenosine triphosphate (ATP)

creatine phosphate

lactic acid

glucose

oxygen

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Verified step by step guidance

Understand the context of muscle contraction: During intense exercise, muscles may experience an oxygen deficit, meaning they are not receiving enough oxygen to meet their energy demands.

Recognize the role of anaerobic respiration: In the absence of sufficient oxygen, muscles switch from aerobic respiration to anaerobic respiration to generate energy.

Identify the byproduct of anaerobic respiration: Lactic acid is produced as a byproduct when glucose is broken down anaerobically to provide energy in the form of ATP.

Consider the role of ATP and creatine phosphate: ATP is the primary energy currency of the cell, and creatine phosphate helps regenerate ATP during short bursts of activity, but neither increases in quantity during oxygen deficit.

Conclude that lactic acid accumulates: During repetitive muscle contraction under oxygen deficit, lactic acid accumulates in the muscle tissue, leading to the sensation of muscle fatigue.