Bio 221 Human Physiology Quiz #3 Study Guide – Step-by-Step Guidance

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Q1. What are the characteristics and importance of REM and Deep sleep?

Background

Topic: Sleep Physiology

This question tests your understanding of the different stages of sleep, specifically REM (Rapid Eye Movement) and Deep sleep (also called slow-wave sleep), and why each is important for human physiology.

Key Terms:

REM Sleep: A sleep stage characterized by rapid eye movements, vivid dreams, and brain activity similar to wakefulness.
Deep Sleep (Slow-Wave Sleep): The deepest stage of non-REM sleep, marked by slow, high-amplitude brain waves.

Step-by-Step Guidance

List the main features of REM sleep (e.g., brain activity, muscle tone, dreaming).
List the main features of Deep sleep (e.g., EEG patterns, physical restoration, hormone release).
Compare and contrast the physiological roles of REM and Deep sleep (e.g., memory consolidation vs. physical repair).
Think about why both stages are necessary for overall health.

Try explaining the importance of each sleep stage before checking the answer!

Q2. How do sleep cycles work, and what changes occur in brain waves (EEG) during sleep?

Background

Topic: Sleep Architecture and EEG

This question focuses on the structure of sleep cycles and how brain wave patterns change throughout the night.

Key Terms:

Sleep Cycle: The progression through different sleep stages (NREM and REM) in a predictable pattern, typically lasting about 90 minutes.
EEG (Electroencephalogram): A recording of brain electrical activity, used to distinguish sleep stages.

Step-by-Step Guidance

Describe the sequence of sleep stages in a typical cycle (NREM stages 1–3/4, then REM).
Explain how the duration of REM and Deep sleep changes across the night.
Identify how EEG wave amplitude and frequency change as you move from wakefulness to deep sleep and then to REM.
Note the similarity between wakefulness and REM sleep EEG patterns, and the differences with Deep sleep.

Try drawing or describing a sleep cycle diagram before checking the answer!

Q3. Why does cutting sleep short really hurt REM sleep?

Background

Topic: Sleep Deprivation and REM Sleep

This question examines the effects of sleep deprivation, especially on REM sleep, and why REM is particularly affected when sleep is shortened.

Key Concept:

REM sleep periods get longer in the later part of the night.

Step-by-Step Guidance

Recall how REM sleep is distributed throughout the night (shorter early, longer later).
Consider what happens to REM sleep if you wake up earlier than usual.
Think about the physiological and cognitive consequences of missing REM sleep.

Try explaining why REM is most affected by short sleep before checking the answer!

Q4. What is the Glymphatic system, how does it work, and when is it most active during the sleep cycle?

Background

Topic: Brain Waste Clearance During Sleep

This question tests your understanding of the Glymphatic system, its function, and its activity during sleep.

Key Terms:

Glymphatic System: A waste clearance pathway in the brain, analogous to the lymphatic system in the rest of the body.

Step-by-Step Guidance

Define the Glymphatic system and its main function.
Describe how the system removes metabolic waste from the brain.
Identify during which sleep stage (REM or Deep sleep) the Glymphatic system is most active.

Try to recall which sleep stage is most restorative for the brain before checking the answer!

Q5. What are the different kinds and classifications of sensory receptors?

Background

Topic: Sensory Physiology

This question asks you to identify and classify the various types of sensory receptors in the body.

Key Terms:

Sensory Receptors: Specialized cells or nerve endings that detect specific types of stimuli.
Classification: By stimulus type (mechanoreceptors, thermoreceptors, etc.), location, and structure.

Step-by-Step Guidance

List the main types of sensory receptors based on the stimulus they detect (e.g., mechanoreceptors, chemoreceptors, etc.).
Classify receptors by their location (exteroceptors, interoceptors, proprioceptors).
Classify receptors by their structural complexity (simple vs. complex).

Try to make a table or chart of receptor types before checking the answer!

Q6. What are the possible effects of interneurons at the circuit level of neural integration?

Background

Topic: Neural Integration

This question focuses on the role of interneurons in processing and modulating sensory input within neural circuits.

Key Terms:

Interneurons: Neurons that connect sensory and motor pathways within the CNS.
Circuit Level: The level at which sensory information is processed and integrated in the CNS.

Step-by-Step Guidance

Describe the general function of interneurons in neural circuits.
List possible effects (e.g., inhibition, excitation, divergence, convergence).
Explain how interneurons can modulate the strength or pattern of sensory signals.

Try to give examples of interneuron effects before checking the answer!

Q7. What is transduction in the context of sensory physiology?

Background

Topic: Sensory Transduction

This question tests your understanding of how sensory receptors convert external stimuli into neural signals.

Key Terms:

Transduction: The process of converting one form of energy (stimulus) into another (electrical signal).

Step-by-Step Guidance

Define transduction in your own words.
Describe the steps involved in converting a physical stimulus into an action potential.
Give an example (e.g., how a mechanoreceptor transduces pressure).

Try to outline the steps of transduction before checking the answer!

Q8. What are phasic and tonic receptors, and how do they differ?

Background

Topic: Sensory Receptor Adaptation

This question asks you to distinguish between two types of sensory receptors based on their response to sustained stimuli.

Key Terms:

Phasic Receptors: Rapidly adapting receptors that respond to changes in stimulus intensity.
Tonic Receptors: Slowly adapting receptors that continue to respond as long as the stimulus is present.

Step-by-Step Guidance

Define phasic and tonic receptors.
Describe how each type responds to a constant stimulus over time.
Give examples of each type of receptor.

Try to think of real-life examples before checking the answer!

Q9. What are the main aspects of sensory perception?

Background

Topic: Sensory Perception

This question focuses on the different components that make up our conscious awareness of sensory stimuli.

Key Terms:

Aspects of Sensory Perception: Includes detection, magnitude estimation, spatial discrimination, feature abstraction, quality discrimination, and pattern recognition.

Step-by-Step Guidance

List the main aspects of sensory perception.
Briefly define each aspect.
Think of examples for each aspect.

Try to match each aspect with an example before checking the answer!

Q10. How is stimulus strength coded to the CNS?

Background

Topic: Neural Coding

This question tests your understanding of how the nervous system encodes the intensity of a stimulus.

Key Terms:

Stimulus Strength Coding: The process by which the CNS interprets the intensity of a stimulus, often via frequency of action potentials and number of receptors activated.

Step-by-Step Guidance

Describe how action potential frequency relates to stimulus intensity.
Explain the role of recruitment (number of receptors activated).
Consider how the CNS distinguishes between weak and strong stimuli.

Try to explain the coding process before checking the answer!

Q11. What is lateral inhibition?

Background

Topic: Sensory Processing

This question asks you to explain a neural mechanism that sharpens sensory perception.

Key Terms:

Lateral Inhibition: The process by which excited neurons reduce the activity of their neighbors, enhancing contrast in sensory input.

Step-by-Step Guidance

Define lateral inhibition.
Describe how it improves sensory discrimination.
Give an example (e.g., touch localization in the skin).

Try to draw a diagram or explain the process before checking the answer!

Q12. Where do functional tracts of neurons travel in the spinal cord? Where are sensory and motor tracts located?

Background

Topic: Spinal Cord Anatomy

This question tests your knowledge of the organization of sensory and motor pathways in the spinal cord.

Key Terms:

Tracts: Bundles of axons in the CNS that carry specific types of information.
Ventral/Dorsal Horns and Roots: Regions of the spinal cord associated with motor and sensory functions.

Step-by-Step Guidance

Identify the general location of sensory tracts (dorsal or ventral horn/root).
Identify the general location of motor tracts.
Explain why this organization is important for function.

Try to label a spinal cord cross-section before checking the answer!

Q13. What is nociception, what are the different kinds, and what neurotransmitters are associated with it?

Background

Topic: Pain Physiology

This question asks you to define nociception, describe its types, and identify neurotransmitters involved in pain signaling.

Key Terms:

Nociception: The neural processes of encoding and processing noxious (painful) stimuli.
Neurotransmitters: Chemicals such as substance P and glutamate involved in pain transmission.

Step-by-Step Guidance

Define nociception.
List the main types of nociceptive pain (e.g., somatic, visceral, neuropathic).
Identify key neurotransmitters involved in nociceptive pathways.

Try to match neurotransmitters to pain types before checking the answer!

Q14. What is the difference between Pain Threshold and Pain Tolerance?

Background

Topic: Pain Perception

This question tests your understanding of two related but distinct concepts in pain physiology.

Key Terms:

Pain Threshold: The minimum intensity at which a stimulus is perceived as painful.
Pain Tolerance: The maximum level of pain a person is able to tolerate.

Step-by-Step Guidance

Define pain threshold and pain tolerance.
Explain how they differ physiologically and psychologically.
Give examples of factors that can influence each.

Try to think of examples for each before checking the answer!

Q15. What is visceral pain?

Background

Topic: Types of Pain

This question asks you to define visceral pain and understand its characteristics.

Key Terms:

Visceral Pain: Pain originating from internal organs.

Step-by-Step Guidance

Define visceral pain.
Describe typical sensations and patterns (e.g., diffuse, poorly localized).
Give examples of conditions that cause visceral pain.

Try to list examples before checking the answer!

Q16. What is phantom pain?

Background

Topic: Pain Syndromes

This question focuses on pain perceived in a body part that is no longer present.

Key Terms:

Phantom Pain: Pain felt in an amputated limb or body part.

Step-by-Step Guidance

Define phantom pain.
Explain possible mechanisms (e.g., CNS reorganization).
Discuss why this pain is real despite the absence of the limb.

Try to explain the phenomenon before checking the answer!

Q17. What is referred pain?

Background

Topic: Pain Pathways

This question asks you to explain why pain from internal organs is sometimes perceived at a distant site.

Key Terms:

Referred Pain: Pain perceived at a location other than the site of the painful stimulus.

Step-by-Step Guidance

Define referred pain.
Describe the neural basis (e.g., convergence of sensory pathways).
Give common examples (e.g., heart attack pain in the left arm).

Try to think of examples before checking the answer!

Q18. How is a peripheral nerve regenerated/repaired, and what other cells are involved?

Background

Topic: Nerve Regeneration

This question tests your understanding of the process of peripheral nerve repair and the cellular players involved.

Key Terms:

Peripheral Nerve Regeneration: The process by which damaged nerves in the PNS repair themselves.
Schwann Cells: Glial cells that play a key role in PNS nerve regeneration.

Step-by-Step Guidance

Outline the steps of peripheral nerve regeneration (e.g., Wallerian degeneration, axon regrowth).
Identify the role of Schwann cells and other supporting cells.
Explain why regeneration is more successful in the PNS than CNS.

Try to list the steps before checking the answer!

Q19. Why does nerve regeneration not happen in the CNS?

Background

Topic: CNS vs. PNS Regeneration

This question asks you to explain why the central nervous system does not regenerate as well as the peripheral nervous system.

Key Terms:

Oligodendrocytes: CNS glial cells that inhibit regeneration.
Inhibitory Molecules: Substances in the CNS that prevent axon regrowth.

Step-by-Step Guidance

List the main reasons why CNS regeneration is limited (e.g., inhibitory environment, lack of growth factors).
Compare the roles of Schwann cells (PNS) and oligodendrocytes (CNS).
Explain the impact of glial scar formation.

Try to summarize the main barriers before checking the answer!

Q20. What happens at a neuromuscular junction (NMJ)?

Background

Topic: Synaptic Transmission

This question tests your understanding of how a nerve signal leads to muscle contraction at the NMJ.

Key Terms:

Neuromuscular Junction (NMJ): The synapse between a motor neuron and a skeletal muscle fiber.
Acetylcholine (ACh): The neurotransmitter released at the NMJ.

Step-by-Step Guidance

Describe the arrival of an action potential at the motor neuron terminal.
Explain the release of ACh into the synaptic cleft.
Describe how ACh binds to receptors on the muscle fiber, leading to depolarization.

Try to outline the sequence before checking the answer!

Q21. How do varicosities work in the autonomic nervous system?

Background

Topic: Autonomic Neurotransmission

This question asks you to explain the structure and function of varicosities in autonomic neurons.

Key Terms:

Varicosities: Swellings along autonomic axons that release neurotransmitters over a wide area.

Step-by-Step Guidance

Define varicosities and their location.
Describe how neurotransmitter release from varicosities differs from classic synapses.
Explain the effect on target tissues (e.g., smooth muscle, glands).

Try to compare varicosities to NMJs before checking the answer!

Q22. What are the parts of a simple spinal reflex, such as the patellar tendon reflex?

Background

Topic: Reflex Arcs

This question tests your understanding of the components and sequence of a basic spinal reflex.

Key Terms:

Reflex Arc: The neural pathway involved in a reflex action.
Patellar Reflex: A classic example of a monosynaptic stretch reflex.

Step-by-Step Guidance

List the components of a reflex arc (receptor, sensory neuron, integration center, motor neuron, effector).
Describe the sequence of events in the patellar reflex.
Explain the significance of monosynaptic vs. polysynaptic reflexes.