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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Multiple Choice

Which of the following muscles extends the knee?

Quadriceps femoris

Gastrocnemius

Sartorius

Biceps femoris

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Verified step by step guidance

Begin by identifying the primary function of each muscle listed in the options. Understanding the action each muscle performs will help determine which one is responsible for extending the knee.

The quadriceps femoris is a group of muscles located at the front of the thigh. Its primary function is to extend the knee joint. This group includes the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius.

The gastrocnemius is a muscle located in the calf. Its main function is plantar flexion of the foot at the ankle joint, and it assists in flexing the knee, not extending it.

The sartorius is a long, thin muscle that runs down the length of the thigh. It is involved in flexing, abducting, and laterally rotating the hip, as well as flexing the knee. It does not extend the knee.

The biceps femoris is part of the hamstring group located at the back of the thigh. Its primary function is to flex the knee and extend the hip, not to extend the knee.