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 best describes the general pattern of neurons in the autonomic nervous system?

A two-neuron chain consisting of a preganglionic and a postganglionic neuron

A three-neuron chain with two synapses in the peripheral nervous system

A direct connection between sensory and motor neurons without synapses

A single neuron extending from the CNS to the effector organ

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Verified step by step guidance

Understand the autonomic nervous system (ANS): The ANS is a division of the peripheral nervous system responsible for involuntary control of body functions, such as heart rate, digestion, and respiratory rate. It operates through a chain of neurons to transmit signals from the central nervous system (CNS) to the effector organs.

Learn the structure of the ANS: The general pattern involves a two-neuron chain. The first neuron, called the preganglionic neuron, originates in the CNS and synapses with the second neuron, called the postganglionic neuron, in an autonomic ganglion.

Clarify the role of the preganglionic neuron: The preganglionic neuron has its cell body in the CNS (either the brainstem or spinal cord) and its axon extends to the autonomic ganglion, where it releases neurotransmitters to activate the postganglionic neuron.

Clarify the role of the postganglionic neuron: The postganglionic neuron has its cell body in the autonomic ganglion and its axon extends to the effector organ (e.g., smooth muscle, cardiac muscle, or glands) to elicit a response.

Compare the options provided: Based on the structure of the ANS, the correct description is 'A two-neuron chain consisting of a preganglionic and a postganglionic neuron,' as this matches the established pattern of signal transmission in the autonomic nervous system.