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

9. Muscle Tissue

Steps of Muscle Contraction

Anatomy & Physiology

9. Muscle Tissue

Steps of Muscle Contraction

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2:12 minutes

Problem 13

Textbook Question

Aerobic exercise results in all of the following except:
a. More capillaries surrounding muscle fibers
b. More mitochondria in muscle cells
c. Increased size and strength of existing muscle cells
d. More myoglobin

Verified step by step guidance

Step 1: Begin by understanding the physiological effects of aerobic exercise on muscle tissue. Aerobic exercise primarily enhances the endurance and efficiency of muscles rather than their size or strength.

Step 2: Review the role of capillaries in muscle tissue. Aerobic exercise increases the number of capillaries surrounding muscle fibers to improve oxygen delivery and waste removal during prolonged activity.

Step 3: Examine the function of mitochondria in muscle cells. Aerobic exercise stimulates the production of more mitochondria, which are essential for energy production through oxidative metabolism.

Step 4: Consider the role of myoglobin in muscle cells. Aerobic exercise increases myoglobin levels, which helps store and transport oxygen within muscle cells to support sustained activity.

Step 5: Analyze the effect of aerobic exercise on muscle size and strength. Unlike resistance training, aerobic exercise does not significantly increase the size or strength of existing muscle cells, making this the correct answer to the question.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Aerobic Exercise

Aerobic exercise refers to physical activities that rely on the aerobic energy-generating process, which uses oxygen to fuel the body during prolonged activities. This type of exercise, such as running or cycling, enhances cardiovascular endurance and promotes various physiological adaptations, including improved oxygen delivery and utilization in muscles.

Muscle Adaptations

Muscle adaptations are physiological changes that occur in response to regular aerobic training. These adaptations include an increase in the number of capillaries, mitochondria, and myoglobin within muscle cells, which collectively enhance the muscles' ability to utilize oxygen and improve endurance. However, significant increases in muscle size and strength are more characteristic of resistance training.

Resistance vs. Aerobic Training

Resistance training focuses on building muscle strength and size through exercises that involve lifting weights or using resistance bands. In contrast, aerobic training primarily improves cardiovascular fitness and endurance without significantly increasing muscle mass. Understanding this distinction is crucial for interpreting the effects of different types of exercise on muscle physiology.