Step-by-Step Guidance for Autonomic Nervous System Exam Review

Q1. Compare the somatic and autonomic nervous systems relative to effectors, efferent pathways, and neurotransmitters released.

Background

Topic: Nervous System Divisions

This question tests your understanding of the structural and functional differences between the somatic and autonomic nervous systems, focusing on what they control (effectors), how signals travel (efferent pathways), and which neurotransmitters are involved.

Key Terms:

• Effectors: Target tissues/organs that respond to neural signals.

• Efferent Pathways: Routes by which motor signals leave the CNS.

• Neurotransmitters: Chemicals released at synapses to transmit signals.

Step-by-Step Guidance

1. Identify the effectors for each system: Somatic (skeletal muscles), Autonomic (smooth muscle, cardiac muscle, glands).

2. Describe the efferent pathways: Somatic (single neuron from CNS to effector), Autonomic (two-neuron chain: preganglionic and postganglionic).

3. List the neurotransmitters released: Somatic (acetylcholine), Autonomic (acetylcholine and norepinephrine, depending on division).

4. Compare the speed and specificity of responses in each system.

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Q2. Compare and contrast the functions of the parasympathetic and sympathetic divisions of the ANS.

Background

Topic: Autonomic Nervous System Divisions

This question asks you to distinguish between the roles of the sympathetic and parasympathetic divisions, including their general effects on the body.

Key Terms:

• Sympathetic Division: "Fight or flight" responses.

• Parasympathetic Division: "Rest and digest" responses.

Step-by-Step Guidance

1. List the main functions of the sympathetic division (e.g., increases heart rate, dilates pupils).

2. List the main functions of the parasympathetic division (e.g., decreases heart rate, constricts pupils).

3. Identify situations where each division is dominant.

4. Compare the effects on organ systems.

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Q3. For the sympathetic division, describe the site of CNS origin, locations of ganglia, and general fiber pathways.

Background

Topic: Sympathetic Division Anatomy

This question focuses on the anatomical features of the sympathetic division, including where its neurons originate, where its ganglia are located, and how its fibers travel.

Key Terms:

• CNS Origin: Where preganglionic neurons start.

• Ganglia: Clusters of neuron cell bodies outside the CNS.

• Fiber Pathways: Routes taken by nerve fibers.

Step-by-Step Guidance

1. Identify the region of the CNS where sympathetic preganglionic neurons originate (e.g., thoracolumbar region).

2. Describe the locations of sympathetic ganglia (e.g., sympathetic trunk, collateral ganglia).

3. Outline the general pathway of sympathetic fibers from CNS to effector organs.

4. Note the difference between preganglionic and postganglionic fibers.

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Q4. For the parasympathetic division, describe the site of CNS origin, locations of ganglia, and general fiber pathways.

Background

Topic: Parasympathetic Division Anatomy

This question is similar to Q3 but focuses on the parasympathetic division's anatomical features.

Key Terms:

• CNS Origin: Where preganglionic neurons start.

• Ganglia: Locations of parasympathetic ganglia.

• Fiber Pathways: Routes taken by nerve fibers.

Step-by-Step Guidance

1. Identify the region of the CNS where parasympathetic preganglionic neurons originate (e.g., craniosacral region).

2. Describe the locations of parasympathetic ganglia (e.g., near or within target organs).

3. Outline the general pathway of parasympathetic fibers from CNS to effector organs.

4. Note the difference between preganglionic and postganglionic fibers.

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Q5. Define cholinergic and adrenergic fibers and list the different types of their receptors.

Background

Topic: Neurotransmitter Types and Receptors

This question tests your knowledge of the types of fibers in the ANS and their associated receptors.

Key Terms:

• Cholinergic Fibers: Release acetylcholine.

• Adrenergic Fibers: Release norepinephrine.

• Receptors: Muscarinic, nicotinic (cholinergic); alpha, beta (adrenergic).

Step-by-Step Guidance

1. Define cholinergic fibers and identify where they are found in the ANS.

2. Define adrenergic fibers and identify where they are found in the ANS.

3. List the types of cholinergic receptors (nicotinic, muscarinic).

4. List the types of adrenergic receptors (alpha, beta).

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Q6. Compare visceral reflexes to somatic reflexes.

Background

Topic: Reflex Arcs

This question asks you to distinguish between reflexes that control internal organs (visceral) and those that control skeletal muscles (somatic).

Key Terms:

• Visceral Reflexes: Involve autonomic effectors.

• Somatic Reflexes: Involve skeletal muscle effectors.

Step-by-Step Guidance

1. Describe the components of a somatic reflex arc.

2. Describe the components of a visceral reflex arc.

3. Compare the effectors and pathways involved in each.

4. Discuss the functional significance of each type.

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Q7. State the effects of the parasympathetic and sympathetic divisions on the following organs: eyes, heart, blood vessels, gastrointestinal tract, lungs, adrenal medulla, and external genitalia.

Background

Topic: ANS Effects on Organs

This question tests your ability to recall and explain how each division of the ANS affects specific organs.

Key Terms:

• Organ-specific effects: How each division alters function.

Step-by-Step Guidance

1. List the effects of the sympathetic division on each organ.

2. List the effects of the parasympathetic division on each organ.

3. Compare and contrast the effects for each organ.

4. Explain the physiological significance of these effects.

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Q8. Describe autonomic nervous system controls.

Background

Topic: ANS Regulation

This question asks you to explain how the autonomic nervous system is regulated and controlled within the body.

Key Terms:

• Central control: Hypothalamus, brainstem, spinal cord.

• Feedback mechanisms: Reflex arcs, sensory input.

Step-by-Step Guidance

1. Identify the main brain regions involved in ANS control.

2. Describe how the hypothalamus integrates and coordinates ANS activity.

3. Explain the role of reflex arcs in ANS regulation.

4. Discuss how sensory input influences ANS responses.

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