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

Introduction to Muscles and Muscle Tissue

Anatomy & Physiology

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

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Multiple Choice

Which of the following is a concentric action of the latissimus dorsi muscle?

Flexing the elbow during a biceps curl

Raising the arms overhead during a shoulder press

Extending the knee during a squat

Pulling the arms downward during a pull-up

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Verified step by step guidance

Step 1: Understand the concept of concentric muscle action. A concentric action occurs when a muscle shortens while generating force, typically during the lifting phase of an exercise.

Step 2: Identify the primary function of the latissimus dorsi muscle. The latissimus dorsi is a large, flat muscle located in the back, and its primary actions include shoulder extension, adduction, and internal rotation.

Step 3: Analyze the movement described in the problem: 'Pulling the arms downward during a pull-up.' During this action, the latissimus dorsi contracts concentrically to pull the arms downward and bring the body upward toward the bar.

Step 4: Compare the other options provided in the problem. Flexing the elbow during a biceps curl primarily involves the biceps brachii, raising the arms overhead during a shoulder press involves the deltoid muscles, and extending the knee during a squat involves the quadriceps. None of these actions are concentric actions of the latissimus dorsi.

Step 5: Conclude that the correct answer is 'Pulling the arms downward during a pull-up,' as this movement directly involves the concentric contraction of the latissimus dorsi muscle.