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

Reflex Arcs

Anatomy & Physiology

13. The Peripheral Nervous System

Reflex Arcs

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Multiple Choice

Which of the following statements about reflexes is true?

Reflexes are automatic responses that do not require conscious thought.

Reflexes always require input from the endocrine system.

Reflexes only occur in response to pain stimuli.

All reflexes involve the brain as the integration center.

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Verified step by step guidance

Step 1: Begin by understanding the concept of reflexes. Reflexes are automatic, involuntary responses to stimuli that help maintain homeostasis and protect the body from harm. They do not require conscious thought, meaning they occur without voluntary control.

Step 2: Analyze the first statement: 'Reflexes are automatic responses that do not require conscious thought.' This aligns with the definition of reflexes, as they are involuntary and automatic. Keep this statement in mind as a potential correct answer.

Step 3: Evaluate the second statement: 'Reflexes always require input from the endocrine system.' Reflexes are primarily mediated by the nervous system, not the endocrine system. The endocrine system regulates hormones and slower processes, so this statement is incorrect.

Step 4: Examine the third statement: 'Reflexes only occur in response to pain stimuli.' Reflexes can occur in response to various stimuli, such as light, sound, or touch, not just pain. For example, the pupillary light reflex responds to light, not pain. This statement is incorrect.

Step 5: Assess the fourth statement: 'All reflexes involve the brain as the integration center.' Some reflexes, such as spinal reflexes, are integrated in the spinal cord and do not involve the brain directly. Therefore, this statement is incorrect. Based on the analysis, the first statement is the correct answer.