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 Actions

Anatomy & Physiology

10. Muscles

Muscle Actions

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Problem 11

Textbook Question

Match the muscle with its main action:
___Sternocleidomastoid muscle
_Transversus abdominis muscle
_Internal oblique muscle
_Rectus abdominis muscle
_Splenius capitis muscle
___Quadratus lumborum muscle.
a. Laterally flexes the trunk
b. Flexes the trunk
c. Compresses the abdominal cavity
d. Extends the vertebral column
e. Flexes the head
f. Extends the head

Verified step by step guidance

Step 1: Understand the main actions of each muscle listed in the problem. For example, the Sternocleidomastoid muscle is responsible for flexing the head and rotating it to the opposite side.

Step 2: Review the anatomical location and function of the Transversus abdominis muscle. This muscle compresses the abdominal cavity, aiding in core stability and respiration.

Step 3: Examine the Internal oblique muscle, which is involved in trunk rotation and lateral flexion. It also assists in compressing the abdominal cavity.

Step 4: Identify the Rectus abdominis muscle, which is primarily responsible for flexing the trunk, such as during sit-ups or bending forward.

Step 5: Match the Splenius capitis muscle and Quadratus lumborum muscle with their actions. The Splenius capitis extends the head, while the Quadratus lumborum laterally flexes the trunk and stabilizes the lumbar spine.

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Key Concepts

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

Muscle Actions

Muscle actions refer to the specific movements that muscles produce when they contract. Understanding the primary actions of different muscles is crucial for identifying their roles in body mechanics. For instance, muscles can flex, extend, rotate, or stabilize various parts of the body, and knowing these actions helps in matching muscles to their functions.

Anatomy of the Core Muscles

The core muscles include various muscle groups that stabilize the trunk and pelvis, playing a vital role in movement and posture. Key muscles such as the rectus abdominis, internal oblique, and transversus abdominis are essential for trunk flexion and stabilization. Familiarity with these muscles and their anatomical locations aids in understanding their specific actions.

Cervical and Lumbar Muscles

Cervical and lumbar muscles, such as the sternocleidomastoid and quadratus lumborum, are responsible for movements of the head and lower back, respectively. The sternocleidomastoid primarily flexes and rotates the head, while the quadratus lumborum laterally flexes the trunk. Recognizing the functions of these muscles is important for accurately matching them to their actions.