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 of the following muscles is primarily responsible for pointing the toe (plantar flexion of the foot)?

Biceps femoris

Gastrocnemius

Rectus femoris

Tibialis anterior

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Verified step by step guidance

Understand the action described in the question: Plantar flexion refers to the movement of the foot where the toes point downward, as in pressing a gas pedal or standing on tiptoes.

Identify the muscle groups involved in plantar flexion: The primary muscles responsible for this action are located in the posterior compartment of the lower leg, including the gastrocnemius and soleus muscles.

Analyze the options provided: The biceps femoris is a muscle of the posterior thigh involved in knee flexion and hip extension, not plantar flexion. The rectus femoris is part of the quadriceps group and primarily extends the knee. The tibialis anterior is located in the anterior compartment of the leg and is responsible for dorsiflexion (lifting the toes upward), which is the opposite of plantar flexion.

Focus on the gastrocnemius: This muscle is part of the calf and works with the soleus to perform plantar flexion. It attaches to the heel via the Achilles tendon and is activated during movements like pointing the toes.

Conclude that the gastrocnemius is the correct answer based on its anatomical location and function in plantar flexion.