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 Heart2h 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

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Stretch reflexes would be hypoactive in all of the following conditions EXCEPT __________.

coma

stroke patients with lesions of the corticospinal tract

chronic diabetes mellitus

neurosyphilis

Previous problemNext problem

Verified step by step guidance

Understand the concept of stretch reflexes: Stretch reflexes are involuntary contractions of muscles in response to stretching within the muscle. They are important for maintaining muscle tone and posture.

Identify conditions that affect stretch reflexes: Conditions that can lead to hypoactive (reduced) stretch reflexes include coma, chronic diabetes mellitus, and neurosyphilis. These conditions typically affect the nervous system's ability to conduct signals properly.

Consider the exception: Stroke patients with lesions of the corticospinal tract may have hyperactive stretch reflexes instead of hypoactive ones. This is because the corticospinal tract is involved in voluntary motor control, and damage can lead to increased reflex activity due to loss of inhibitory control.

Analyze the role of the corticospinal tract: The corticospinal tract is a major pathway for motor signals from the brain to the spinal cord. Lesions in this tract can disrupt normal motor control, often resulting in exaggerated reflexes.

Conclude the exception: Based on the understanding of the conditions and the role of the corticospinal tract, stroke patients with lesions of the corticospinal tract are the exception where stretch reflexes would not be hypoactive.