Guided Study for Nervous System and Tissue (CH 11) – ANP College Course

Q1. List the basic functions of the nervous system.

Background

Topic: Overview of Nervous System Functions

This question tests your understanding of the primary roles the nervous system plays in the human body, which is foundational for all further study in neuroanatomy and physiology.

Key Terms:

• Sensory Input: Gathering information from sensory receptors about internal and external changes.

• Integration: Processing and interpreting sensory input to determine an appropriate response.

• Motor Output: Activating effector organs (muscles and glands) to cause a response.

Step-by-Step Guidance

1. Think about how the body detects changes in the environment (both inside and outside the body). What is the first step in this process?

2. Consider what happens after the body receives information. How does the nervous system process this information?

3. Finally, reflect on how the body responds to the processed information. What actions does the nervous system initiate?

Try listing the functions before checking the answer!

Q2. Classify the structural and functional divisions of the nervous system.

Background

Topic: Organization of the Nervous System

This question assesses your ability to distinguish between the main anatomical and operational subdivisions of the nervous system.

Key Terms:

• Central Nervous System (CNS)

• Peripheral Nervous System (PNS)

• Somatic Nervous System

• Autonomic Nervous System (ANS)

• Sympathetic and Parasympathetic Divisions

Step-by-Step Guidance

1. Start by identifying the two main structural divisions of the nervous system. What organs or structures are included in each?

2. Next, consider how the peripheral nervous system is further divided based on function. What are the two main functional subdivisions?

3. Within the autonomic nervous system, think about the two opposing subdivisions that regulate involuntary functions. What are they called?

Try classifying the divisions before checking the answer!

Q3. Describe the important structural components of a neuron and their functional roles.

Background

Topic: Neuron Structure and Function

This question focuses on your knowledge of neuron anatomy and the specific roles of each part in neural signaling.

Key Terms:

• Cell Body (Soma)

• Dendrites

• Axon

• Axon Terminals

• Myelin Sheath

Step-by-Step Guidance

1. List the main parts of a typical neuron.

2. For each part, briefly describe its structure (e.g., shape, location) and its primary function in neural communication.

3. Consider how these components work together to transmit signals within the nervous system.

Try describing each component before checking the answer!

Q4. Classify neurons by structure and by function.

Background

Topic: Neuron Classification

This question tests your ability to distinguish neurons based on their shape and their role in the nervous system.

Key Terms:

• Structural Classification: Multipolar, Bipolar, Unipolar

• Functional Classification: Sensory (Afferent), Motor (Efferent), Interneurons

Step-by-Step Guidance

1. Recall the three main structural types of neurons and what distinguishes them (number and arrangement of processes).

2. Think about the three main functional types of neurons and what each does in the nervous system.

3. Match examples of each type to their typical locations or roles in the body.

Try classifying neurons before checking the answer!

Q5. Explain the functions of the various types of neuroglia.

Background

Topic: Neuroglia (Glial Cells)

This question assesses your understanding of the supporting cells in the nervous system and their diverse roles.

Key Terms:

• Astrocytes

• Microglia

• Ependymal Cells

• Oligodendrocytes

• Schwann Cells

• Satellite Cells

Step-by-Step Guidance

1. List the main types of neuroglia found in the CNS and PNS.

2. For each type, describe its primary function(s) in supporting neurons.

3. Consider how these cells contribute to the health and efficiency of neural tissue.

Try explaining the functions before checking the answer!

Q6. Explain the structure and function of the myelin sheath in the central and peripheral nervous systems.

Background

Topic: Myelination

This question tests your knowledge of how myelin is formed, its role in neural conduction, and the differences between CNS and PNS myelination.

Key Terms:

• Myelin Sheath

• Oligodendrocytes (CNS)

• Schwann Cells (PNS)

• Nodes of Ranvier

Step-by-Step Guidance

1. Describe what the myelin sheath is and its basic structure.

2. Explain which cells produce myelin in the CNS and PNS, and how their methods differ.

3. Discuss the functional importance of myelin in neural signaling.

Try explaining before checking the answer!

Q7. Differentiate between (1) a nucleus and a ganglion, and (2) a nerve and a tract.

Background

Topic: Nervous System Terminology

This question checks your understanding of key anatomical terms used to describe clusters of neurons and bundles of axons in the CNS and PNS.

Key Terms:

• Nucleus (CNS)

• Ganglion (PNS)

• Nerve (PNS)

• Tract (CNS)

Step-by-Step Guidance

1. Define what a nucleus and a ganglion are, and specify where each is found.

2. Define what a nerve and a tract are, and specify where each is found.

3. Summarize the main differences between each pair.

Try differentiating before checking the answer!

Q8. Identify different types of membrane ion channels.

Background

Topic: Membrane Physiology

This question tests your knowledge of the various ion channels that control the movement of ions across the neuronal membrane.

Key Terms:

• Leak Channels

• Voltage-Gated Channels

• Ligand-Gated Channels

• Mechanically Gated Channels

Step-by-Step Guidance

1. List the main types of ion channels found in neuron membranes.

2. For each type, describe what triggers the channel to open or close.

3. Consider where each type is typically found on the neuron.

Try identifying the channels before checking the answer!

Q9. Define resting membrane potential and describe its electrochemical basis.

Background

Topic: Membrane Potentials

This question assesses your understanding of the electrical charge difference across the neuronal membrane and the factors that establish it.

Key Terms and Formula:

• Resting Membrane Potential (RMP)

• Na+/K+ Pump

• Electrochemical Gradient

Key formula (Nernst Equation for a single ion):

$E_{ion} = \frac{RT}{zF} \ln \left( \frac{[ion]_{out}}{[ion]_{in}} \right)$

Step-by-Step Guidance

1. Define what is meant by the resting membrane potential in neurons.

2. Identify the main ions involved in establishing the RMP and their relative concentrations inside and outside the cell.

3. Explain the role of the sodium-potassium pump and leak channels in maintaining the RMP.

Try defining and describing before checking the answer!

Q10. Describe graded potentials and name examples.

Background

Topic: Local Membrane Potentials

This question tests your understanding of small, localized changes in membrane potential and their significance in neural signaling.

Key Terms:

• Graded Potential

• Depolarization

• Hyperpolarization

• Postsynaptic Potential

Step-by-Step Guidance

1. Define what a graded potential is and how it differs from an action potential.

2. Describe how graded potentials are generated and where they typically occur on the neuron.

3. List at least two examples of graded potentials (e.g., EPSP, IPSP, receptor potential).

Try describing and naming examples before checking the answer!

Q11. Compare and contrast graded potentials and action potentials.

Background

Topic: Neural Signaling

This question assesses your ability to distinguish between the two main types of electrical signals in neurons.

Key Terms:

• Graded Potential

• Action Potential

• All-or-None Principle

• Decremental Conduction

Step-by-Step Guidance

1. List the main characteristics of graded potentials (e.g., amplitude, duration, location).

2. List the main characteristics of action potentials.

3. Identify at least two key differences and one similarity between the two types of potentials.

Try comparing and contrasting before checking the answer!

Q12. Explain how action potentials are generated and propagated along neurons.

Background

Topic: Action Potential Mechanism

This question tests your understanding of the sequence of events that lead to the initiation and movement of action potentials.

Key Terms and Formula:

• Threshold

• Depolarization

• Repolarization

• Voltage-Gated Na+ and K+ Channels

Step-by-Step Guidance

1. Describe what triggers the opening of voltage-gated sodium channels and the resulting depolarization.

2. Explain what happens when the membrane potential reaches its peak (inactivation of Na+ channels, opening of K+ channels).

3. Discuss how the action potential moves along the axon (propagation).

Try explaining the process before checking the answer!

Q13. Define absolute and relative refractory periods.

Background

Topic: Action Potential Refractory Periods

This question assesses your understanding of the periods during which a neuron cannot or is less likely to fire another action potential.

Key Terms:

• Absolute Refractory Period

• Relative Refractory Period

Step-by-Step Guidance

1. Define the absolute refractory period and explain why it occurs.

2. Define the relative refractory period and explain what is different during this time compared to the absolute period.

3. Consider the functional significance of these periods for neural signaling.

Try defining each period before checking the answer!

Q14. Define saltatory conduction and explain how it differs from continuous conduction.

Background

Topic: Neural Conduction Mechanisms

This question tests your understanding of how myelination affects the speed and pattern of action potential propagation.

Key Terms:

• Saltatory Conduction

• Continuous Conduction

• Nodes of Ranvier

Step-by-Step Guidance

1. Define saltatory conduction and describe where it occurs.

2. Define continuous conduction and describe where it occurs.

3. Compare the speed and efficiency of the two types of conduction.

Try defining and explaining before checking the answer!