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

Paralysis of which of the following muscles would make an individual unable to flex the knee?

Biceps femoris

Tibialis anterior

Gastrocnemius

Rectus femoris

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Verified step by step guidance

Step 1: Understand the anatomy of the knee joint and the muscles involved in knee flexion. Knee flexion is the movement that decreases the angle between the thigh and the lower leg, and it is primarily performed by muscles in the posterior compartment of the thigh.

Step 2: Identify the primary muscles responsible for knee flexion. These muscles are part of the hamstring group, which includes the biceps femoris, semitendinosus, and semimembranosus. The biceps femoris is particularly important for this action.

Step 3: Analyze the function of each muscle listed in the options. The biceps femoris is a hamstring muscle responsible for knee flexion. The tibialis anterior is located in the anterior compartment of the leg and is involved in dorsiflexion of the foot, not knee flexion. The gastrocnemius, a calf muscle, assists in plantar flexion of the foot and can contribute slightly to knee flexion when the leg is extended. The rectus femoris is part of the quadriceps group and is primarily involved in knee extension, not flexion.

Step 4: Determine which muscle's paralysis would directly impair knee flexion. Since the biceps femoris is a key muscle in the hamstring group responsible for flexing the knee, its paralysis would make an individual unable to perform this movement.

Step 5: Conclude that the correct answer is the biceps femoris, as it is the primary muscle responsible for knee flexion, and its paralysis would directly prevent this action.