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Guided Study Notes for Nervous System and Tissue (CH 11)

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Tailored notes based on your materials, expanded with key definitions, examples, and context.

Q1. What are 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 body, which is foundational for all later topics in neurobiology.

Key Terms:

  • Sensory input

  • Integration

  • Motor output

Step-by-Step Guidance

  1. Recall that the nervous system is responsible for detecting changes inside and outside the body. Think about what this detection is called.

  2. Consider how the nervous system processes and interprets sensory input. What is this process called?

  3. Think about how the nervous system responds to stimuli. What is the term for the activation of effector organs (muscles and glands)?

Try solving on your own before revealing the answer!

Q2. How is the nervous system classified structurally and functionally?

Background

Topic: Divisions of the Nervous System

This question asks you to distinguish between the main structural and functional subdivisions of the nervous system, which is essential for understanding its organization.

Key Terms:

  • Central Nervous System (CNS)

  • Peripheral Nervous System (PNS)

  • Somatic Nervous System

  • Autonomic Nervous System

  • Sympathetic and Parasympathetic Divisions

Step-by-Step Guidance

  1. Start by identifying the two main structural divisions of the nervous system.

  2. Next, consider how the peripheral nervous system is further divided based on function.

  3. Think about the subdivisions of the autonomic nervous system and what roles they play.

Try solving on your own before revealing the answer!

Q3. What are the important structural components of a neuron, and what are their functional roles?

Background

Topic: Neuron Structure and Function

This question focuses on the anatomy of a neuron and the specific functions of each part.

Key Terms:

  • Cell body (soma)

  • Dendrites

  • Axon

  • Axon hillock

  • Axon terminals

Step-by-Step Guidance

  1. List the main parts of a neuron and briefly describe their location.

  2. For each part, think about its primary function (e.g., receiving signals, transmitting impulses).

  3. Consider how these structures work together to allow the neuron to communicate.

Try solving on your own before revealing the answer!

Q4. How are neurons classified by structure and by function?

Background

Topic: Neuron Classification

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

Key Terms:

  • Multipolar, bipolar, unipolar neurons (structural)

  • Sensory (afferent), motor (efferent), interneurons (functional)

Step-by-Step Guidance

  1. Recall the criteria used for structural classification (number of processes extending from the cell body).

  2. List the three main structural types and their characteristics.

  3. For functional classification, think about the direction in which the neuron transmits impulses relative to the CNS.

Try solving on your own before revealing the answer!

Q5. What are the functions of the various types of neuroglia?

Background

Topic: Neuroglia (Glial Cells)

This question asks you to identify the different types of supporting cells in the nervous system and their 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, briefly describe its primary function (e.g., support, insulation, immune defense).

  3. Consider how these cells contribute to the overall health and function of neurons.

Try solving on your own before revealing the answer!

Q6. What is the structure and function of the myelin sheath in the central and peripheral nervous systems?

Background

Topic: Myelination

This question focuses on the insulating layer around axons and its importance in nerve impulse conduction.

Key Terms:

  • Myelin sheath

  • Oligodendrocytes (CNS)

  • Schwann cells (PNS)

  • Nodes of Ranvier

Step-by-Step Guidance

  1. Describe what the myelin sheath is and where it is found.

  2. Identify which cells produce myelin in the CNS and PNS.

  3. Explain how myelin affects the speed of nerve impulse transmission.

Try solving on your own before revealing the answer!

Q7. How do a nucleus and a ganglion differ? How do a nerve and a tract differ?

Background

Topic: Nervous System Terminology

This question tests your understanding of anatomical terms used to describe clusters of neuron cell bodies 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 is in the context of the nervous system and where it is found.

  2. Define what a ganglion is and where it is found.

  3. Explain the difference between a nerve and a tract, including their locations.

Try solving on your own before revealing the answer!

Q8. What are the different types of membrane ion channels?

Background

Topic: Membrane Ion Channels

This question asks you to identify and describe the various types of ion channels found in neuron membranes.

Key Terms:

  • Leak channels

  • Ligand-gated channels

  • Voltage-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 causes the channel to open or close.

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

Try solving on your own before revealing the answer!

Q9. What is resting membrane potential, and what is its electrochemical basis?

Background

Topic: Resting Membrane Potential

This question focuses on the electrical charge difference across the neuron's membrane when it is not transmitting a signal, and the factors that establish this potential.

Key Terms and Formula:

  • Resting membrane potential (typically around -70 mV)

  • Sodium-potassium pump

  • Ion concentration gradients

  • Selective permeability of the membrane

Step-by-Step Guidance

  1. Define what is meant by resting membrane potential.

  2. Identify the main ions involved in establishing this potential.

  3. Explain the role of the sodium-potassium pump and membrane permeability in maintaining the potential.

Try solving on your own before revealing the answer!

Q10. What are graded potentials, and can you name examples?

Background

Topic: Graded Potentials

This question asks you to describe small, localized changes in membrane potential and provide examples.

Key Terms:

  • Graded potential

  • Depolarization

  • Hyperpolarization

  • Postsynaptic potential

  • Receptor potential

Step-by-Step Guidance

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

  2. List some examples of graded potentials and where they occur.

  3. Consider what causes graded potentials and how they can summate.

Try solving on your own before revealing the answer!

Q11. How do graded potentials and action potentials compare and contrast?

Background

Topic: Electrical Signals in Neurons

This question asks you to analyze the similarities and differences between graded and action potentials.

Key Terms:

  • Amplitude

  • Propagation

  • Threshold

  • Summation

Step-by-Step Guidance

  1. List the main characteristics of graded potentials (e.g., amplitude, decremental conduction).

  2. List the main characteristics of action potentials (e.g., all-or-none, non-decremental propagation).

  3. Compare and contrast these features in a table or list format.

Try solving on your own before revealing the answer!

Q12. How are action potentials generated and propagated along neurons?

Background

Topic: Action Potential Generation and Propagation

This question focuses on the sequence of events that lead to the initiation and movement of an action potential along a neuron.

Key Terms and Formula:

  • Threshold

  • Depolarization

  • Repolarization

  • Voltage-gated sodium and potassium channels

Step-by-Step Guidance

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

  2. Explain the sequence of ion movements during depolarization and repolarization.

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

Try solving on your own before revealing the answer!

Q13. What are absolute and relative refractory periods?

Background

Topic: Refractory Periods

This question tests 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 what causes it.

  2. Define the relative refractory period and how it differs from the absolute period.

  3. Consider the physiological significance of these periods for nerve impulse transmission.

Try solving on your own before revealing the answer!

Q14. What is saltatory conduction, and how does it differ from continuous conduction?

Background

Topic: Nerve Impulse Conduction

This question asks you to explain the difference between two types of action potential propagation along axons.

Key Terms:

  • Saltatory conduction

  • Continuous conduction

  • Myelinated vs. unmyelinated axons

  • 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 both types of conduction.

Try solving on your own before revealing the answer!

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