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

14. The Autonomic Nervous System

Introduction to the Autonomic Nervous System

Anatomy & Physiology

14. The Autonomic Nervous System

Introduction to the Autonomic Nervous System

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Multiple Choice

Which of the following is an effect of norepinephrine binding to beta-2 adrenergic receptors?

Stimulation of digestive gland secretion

Bronchodilation in the lungs

Increased heart rate

Constriction of blood vessels in the skin

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Verified step by step guidance

Step 1: Understand the role of norepinephrine in the autonomic nervous system. Norepinephrine is a neurotransmitter and hormone that primarily acts on adrenergic receptors, which are divided into alpha and beta subtypes. Beta-2 adrenergic receptors are specifically involved in smooth muscle relaxation in certain tissues.

Step 2: Learn the physiological effects of beta-2 adrenergic receptor activation. When norepinephrine binds to beta-2 adrenergic receptors, it triggers a signaling cascade that leads to the relaxation of smooth muscles, particularly in the airways and blood vessels.

Step 3: Focus on the lungs. Beta-2 adrenergic receptor activation in the lungs causes bronchodilation, which is the widening of the airways. This effect helps improve airflow and is critical during the 'fight or flight' response.

Step 4: Eliminate incorrect options. Stimulation of digestive gland secretion is not associated with beta-2 adrenergic receptors; it is more related to parasympathetic activity. Increased heart rate is primarily mediated by beta-1 adrenergic receptors, not beta-2. Constriction of blood vessels in the skin is mediated by alpha adrenergic receptors, not beta-2.

Step 5: Conclude that the correct effect of norepinephrine binding to beta-2 adrenergic receptors is bronchodilation in the lungs, as this aligns with the receptor's role in smooth muscle relaxation in the airways.