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

10. Muscles

Muscle Naming

Anatomy & Physiology

10. Muscles

Muscle Naming

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2:32 minutes

Problem 13

Textbook Question

Which of the following is a large, deep muscle that protracts the scapula during punching?
a. Serratus anterior
b. Rhomboids
c. Levator scapulae
d. Subscapularis

Verified step by step guidance

Step 1: Understand the function of protraction of the scapula. Protraction refers to the movement of the scapula forward and around the rib cage, as seen during punching or pushing motions.

Step 2: Analyze the role of each muscle option provided. The Serratus anterior is known for its role in protracting the scapula, while the Rhomboids retract the scapula, the Levator scapulae elevates the scapula, and the Subscapularis is involved in internal rotation of the shoulder.

Step 3: Focus on the anatomy of the Serratus anterior. It is a large, flat muscle located on the lateral side of the rib cage, originating from the upper ribs and inserting onto the medial border of the scapula.

Step 4: Relate the Serratus anterior's function to punching movements. During punching, the Serratus anterior contracts to pull the scapula forward and stabilize it against the thoracic wall, enabling effective arm extension.

Step 5: Confirm that the Serratus anterior is the correct answer based on its anatomical location and function in scapular protraction during punching.

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Key Concepts

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

Serratus Anterior

The serratus anterior is a large, fan-shaped muscle located on the lateral aspect of the thorax. It plays a crucial role in the protraction of the scapula, which is essential for movements such as punching. This muscle helps stabilize the scapula against the thoracic wall, allowing for greater range of motion in the shoulder joint.

Scapular Protraction

Scapular protraction refers to the movement of the scapula away from the spine, which is vital for various upper body movements, including pushing and punching. This action is primarily facilitated by the serratus anterior muscle, enabling the arm to extend forward effectively. Understanding this movement is key to analyzing upper body mechanics in sports and physical activities.

Muscle Function in Upper Body Movements

Different muscles in the upper body contribute to specific movements, such as punching. The serratus anterior, rhomboids, levator scapulae, and subscapularis each have distinct roles, with the serratus anterior being particularly important for protraction. Recognizing the function of these muscles helps in understanding how they work together to perform complex actions.