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

13. The Peripheral Nervous System

Introduction to Reflex Arcs

Anatomy & Physiology

13. The Peripheral Nervous System

Introduction to Reflex Arcs

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Multiple Choice

During the knee-jerk (patellar) reflex, the letter 'e' would most likely represent which of the following muscles?

Quadriceps femoris

Tibialis anterior

Hamstring

Gastrocnemius

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Verified step by step guidance

Understand the knee-jerk (patellar) reflex: This reflex is a monosynaptic reflex that occurs when the patellar tendon is tapped, causing a stretch in the quadriceps femoris muscle. The reflex arc involves sensory neurons, the spinal cord, and motor neurons.

Identify the role of the quadriceps femoris: The quadriceps femoris is the primary muscle responsible for extending the knee. When the patellar tendon is stretched, it triggers the contraction of this muscle to produce the reflex action.

Eliminate incorrect options: The tibialis anterior is involved in dorsiflexion of the foot, the hamstring group is responsible for knee flexion, and the gastrocnemius is involved in plantar flexion of the foot. None of these muscles are directly involved in the knee-jerk reflex.

Focus on the correct muscle: The quadriceps femoris is the muscle that contracts during the knee-jerk reflex, leading to the extension of the knee. This is the muscle represented by the letter 'e' in the reflex arc.

Conclude the reasoning: Based on the anatomy and physiology of the reflex arc, the quadriceps femoris is the correct answer because it is the muscle activated during the knee-jerk reflex.