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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1:42 minutes

Problem 11

Textbook Question

The prime mover of thigh extension against resistance is the:
a. Gluteus maximus
b. Gluteus medius
c. Biceps femoris
d. Semimembranosus

Verified step by step guidance

Step 1: Understand the concept of a 'prime mover' in anatomy. A prime mover, also known as an agonist, is the muscle primarily responsible for producing a specific movement during an action.

Step 2: Recall the anatomy of the thigh and the muscles involved in extension. Thigh extension refers to the movement of the thigh backward, such as when standing up from a seated position or performing a squat.

Step 3: Identify the major muscles involved in thigh extension. These include the gluteus maximus, gluteus medius, and hamstring muscles (biceps femoris, semimembranosus, and semitendinosus).

Step 4: Focus on the role of the gluteus maximus. The gluteus maximus is the largest and most powerful muscle in the gluteal region, and it is the primary muscle responsible for extending the thigh, especially against resistance, such as during climbing stairs or lifting weights.

Step 5: Compare the roles of the other muscles listed in the options. The gluteus medius primarily functions in abduction and stabilization of the hip, while the biceps femoris and semimembranosus are part of the hamstring group, which assist in thigh extension but are not the prime movers.

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Key Concepts

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

Muscle Function

Muscle function refers to the specific roles that muscles play in movement and stability. In the context of thigh extension, understanding which muscles are primarily responsible for this action is crucial. The prime mover, or agonist, is the muscle that contracts to produce the desired movement, while antagonists and synergists assist or oppose this action.

Thigh Extension

Thigh extension is the movement that increases the angle between the thigh and the pelvis, primarily occurring at the hip joint. This action is essential for various activities such as walking, running, and jumping. Identifying the muscles involved in this movement helps in understanding their roles in physical activities and rehabilitation.

Muscle Anatomy

Muscle anatomy involves the study of the structure and location of muscles in the body. Key muscles involved in thigh extension include the gluteus maximus, which is the largest muscle in the buttock region, and other muscles like the biceps femoris and semimembranosus. Knowing the anatomy of these muscles aids in recognizing their functions and contributions to movement.

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Related Practice

Textbook Question

Several muscles act to move and/or stabilize the scapula. Which of the following are small rectangular muscles that square the shoulders as they act together to retract the scapula?

a. Levator scapulae

b. Rhomboids

c. Serratus anterior

d. Trapezius

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