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

Neurotransmitters of the ANS

Anatomy & Physiology

14. The Autonomic Nervous System

Neurotransmitters of the ANS

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Multiple Choice

Neurotransmitters released by sympathetic postganglionic fibers going to the heart would cause __________.

an increase in rate and force

an increase in rate and a decrease in force

a decrease in both rate and force

a decrease in rate and an increase in force

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Verified step by step guidance

Understand the role of the sympathetic nervous system: The sympathetic nervous system is part of the autonomic nervous system responsible for the 'fight or flight' response, which generally prepares the body for action.

Identify the neurotransmitter involved: Sympathetic postganglionic fibers typically release norepinephrine, a neurotransmitter that affects heart function.

Consider the effect of norepinephrine on the heart: Norepinephrine binds to adrenergic receptors in the heart, primarily beta-1 receptors, which are known to increase heart rate and contractility (force of contraction).

Analyze the options given: Based on the effect of norepinephrine, the correct choice would be the one that describes an increase in both the rate and force of heart contractions.

Conclude the reasoning: The sympathetic nervous system, through norepinephrine, increases the heart's rate and force, aligning with the 'fight or flight' response to prepare the body for increased activity.