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

Which muscle is responsible for plantar flexing the foot and flexing the knee?

Tibialis anterior

Gastrocnemius

Rectus femoris

Soleus

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Verified step by step guidance

Step 1: Understand the action of plantar flexion and knee flexion. Plantar flexion refers to pointing the toes downward, while knee flexion involves bending the knee.

Step 2: Review the anatomy of the muscles listed in the options. The tibialis anterior is primarily responsible for dorsiflexion (lifting the foot upward), not plantar flexion. The rectus femoris is part of the quadriceps group and primarily extends the knee, not flexes it.

Step 3: Focus on the gastrocnemius and soleus muscles. Both are part of the posterior compartment of the leg and contribute to plantar flexion. However, the gastrocnemius also crosses the knee joint and assists in knee flexion, while the soleus does not.

Step 4: Recall that the gastrocnemius is a biarticular muscle, meaning it acts on two joints: the ankle (for plantar flexion) and the knee (for flexion). This makes it the correct answer for the problem.

Step 5: Confirm the correct answer by eliminating the other options and verifying the dual function of the gastrocnemius in plantar flexion and knee flexion.