Study Guidance for Chapter 14: The Autonomic Nervous System (ANP College Level)

Q1. Fill in the blanks: The autonomic nervous system (ANS) is the _________________ (voluntary or involuntary) part of the ___________________ (sensory or motor) division of the _______________ (central or peripheral) nervous system.

Background

Topic: Autonomic Nervous System (ANS) Overview

This question tests your understanding of the basic definition and classification of the ANS within the nervous system.

Key Terms:

• Autonomic Nervous System (ANS): Controls involuntary functions such as heart rate, digestion, and respiratory rate.

• Peripheral Nervous System (PNS): The part of the nervous system outside the brain and spinal cord.

• Motor Division: Carries signals from the CNS to muscles and glands.

Step-by-Step Guidance

1. Recall that the ANS is responsible for involuntary actions (not under conscious control).

2. Determine whether the ANS is part of the sensory or motor division. Think about whether it sends signals to effectors or receives sensory input.

3. Decide if the ANS belongs to the central or peripheral nervous system. Consider where its nerves are located and what it connects.

Try solving on your own before revealing the answer!

Q2. Name the two subdivisions of the ANS.

Background

Topic: ANS Subdivisions

This question is about identifying the two main branches of the autonomic nervous system.

Key Terms:

• Parasympathetic Division: Often called "rest and digest," promotes maintenance functions.

• Sympathetic Division: Often called "fight or flight," mobilizes the body during activity.

Step-by-Step Guidance

1. Recall the two main divisions of the ANS and their general functions.

2. Think about which division is active during stress and which is active during relaxation.

Try solving on your own before revealing the answer!

Q3. What is the overall role of the ANS?

Background

Topic: ANS Function

This question asks you to summarize the primary purpose of the autonomic nervous system.

Key Terms:

• Effectors: Organs or tissues that respond to nervous system signals.

• Homeostasis: The body's ability to maintain stable internal conditions.

Step-by-Step Guidance

1. Think about the types of organs and tissues the ANS controls (e.g., heart, glands, smooth muscle).

2. Consider how the ANS helps maintain internal balance and respond to external changes.

Try solving on your own before revealing the answer!

Q4. For each of the following statements, assign S or A to indicate if it applies more to the somatic nervous system (S) or the autonomic nervous system (A).

Background

Topic: Somatic vs. Autonomic Nervous System Comparison

This question tests your ability to distinguish between the somatic and autonomic nervous systems based on their characteristics.

Key Terms:

• Somatic Nervous System: Controls voluntary movements of skeletal muscles.

• Autonomic Nervous System: Controls involuntary functions of smooth muscle, cardiac muscle, and glands.

• Preganglionic and Postganglionic Fibers: Refers to the two-neuron chain in the ANS.

• Neurotransmitters: Chemical messengers released at synapses.

Step-by-Step Guidance

1. Review each statement and decide if it describes voluntary or involuntary control.

2. Identify whether the system uses a single neuron or a two-neuron chain to reach effectors.

3. Recall which system innervates skeletal muscle versus smooth/cardiac muscle and glands.

4. Think about the neurotransmitters released and whether the effect is always excitatory or can be inhibitory.

Try solving on your own before revealing the answer!

Q5. The illustration below shows a fiber pathway. Does it show a parasympathetic or sympathetic fiber pathway? List two characteristics that helped you determine the correct answer.

Background

Topic: ANS Fiber Pathways

This question asks you to analyze a diagram and identify whether it represents a parasympathetic or sympathetic pathway, based on structural and neurotransmitter clues.

Key Terms:

• Preganglionic Axon: The first neuron in the pathway, originating in the CNS.

• Postganglionic Axon: The second neuron, connecting the ganglion to the effector.

• Acetylcholine (ACh): A neurotransmitter released by certain ANS fibers.

Step-by-Step Guidance

1. Examine the diagram for the length of the preganglionic and postganglionic axons.

2. Identify the neurotransmitter released at both synapses (ACh is shown).

3. Recall which division of the ANS uses ACh at both synapses and typically has long preganglionic and short postganglionic fibers.

Try solving on your own before revealing the answer!