Neuroscience Basics: Sensory and Motor Neurons
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Questions and Answers

What triggers the firing of sensory neurons?

  • Sensory input from the environment (correct)
  • Chemical signals from motor neurons
  • Movement of muscles
  • Electrical impulses from the brain

    • Which type of neuron directly controls muscle movements?

  • Interneurons
  • Motor neurons (correct)
  • Sensory neurons
  • Upper motor neurons

    • What distinguishes upper motor neurons from lower motor neurons?

  • Lower motor neurons transfer signals between interneurons
  • Upper motor neurons connect muscles to the spinal cord
  • Upper motor neurons travel between the brain and spinal cord (correct)
  • Lower motor neurons connect the brain to the spinal cord

    • What are the main types of cells found in the nervous system?

    <p>Sensory neurons, motor neurons, and interneurons</p> Signup and view all the answers

    What happens during the depolarization phase of an action potential?

    <p>Sodium ions rush into the neuron</p> Signup and view all the answers

    What occurs during the repolarization phase of an action potential?

    <p>Sodium channels close quickly</p> Signup and view all the answers

    What is the initial membrane potential of a neuron before action potential initiation?

    <p>-70mV</p> Signup and view all the answers

    Which statement about interneurons is correct?

    <p>They form circuits and communicate with both sensory and motor neurons</p> Signup and view all the answers

    What primarily occurs during somal translocation?

    <p>Neurons grow extensions.</p> Signup and view all the answers

    What is the role of growth cones in axon and dendrite development?

    <p>To extend and retract fingerlike projections.</p> Signup and view all the answers

    What is the primary difference between necrosis and apoptosis?

    <p>Apoptosis is a controlled process, while necrosis is not.</p> Signup and view all the answers

    Which hypothesis suggests that chemical signals guide neuronal migration to specific locations?

    <p>Chemo Affinity Hypothesis</p> Signup and view all the answers

    What type of muscle is responsible for the contraction that moves food along the digestive tract?

    <p>Smooth muscle</p> Signup and view all the answers

    What can result if neuron death does not occur during neurodevelopment?

    <p>Potentially harmful cancer</p> Signup and view all the answers

    Which nervous system governs voluntary muscle contractions?

    <p>Somatic nervous system</p> Signup and view all the answers

    Which of the following is NOT considered a basic function of the nervous system?

    <p>Motor coordination</p> Signup and view all the answers

    How are involuntary responses typically characterized?

    <p>They often occur as reflex actions</p> Signup and view all the answers

    What issue arises when trying to fit functional differences into anatomical divisions of the nervous system?

    <p>Anatomical divisions can overlap in functional roles.</p> Signup and view all the answers

    What is the process called when sensory information is compared with past experiences or states?

    <p>Response integration</p> Signup and view all the answers

    Which part of the nervous system processes visual stimuli for conscious perception?

    <p>Cerebral cortex</p> Signup and view all the answers

    What role do eccrine and merocrine sweat glands play in the body?

    <p>They regulate body temperature through sweat production</p> Signup and view all the answers

    What role do psychotropic medications play in treating psychological disorders?

    <p>They help restore neurotransmitter balance.</p> Signup and view all the answers

    Which of the following is a characteristic of the autonomic nervous system?

    <p>It is involved in subconscious control of bodily functions.</p> Signup and view all the answers

    What may influence a batter's decision to swing at a pitched baseball?

    <p>The trajectory and speed of the ball</p> Signup and view all the answers

    Which neurotransmitter is particularly involved in muscle action and memory?

    <p>Acetylcholine</p> Signup and view all the answers

    How do agonists affect neurotransmitter systems?

    <p>They mimic neurotransmitters and enhance their effects.</p> Signup and view all the answers

    Which of the following statements about reflexes is true?

    <p>They often occur without conscious awareness.</p> Signup and view all the answers

    What is a likely effect of increased serotonin levels in the brain?

    <p>Modulated mood</p> Signup and view all the answers

    What potential effect does gamma-aminobutyric acid (GABA) have on behavior?

    <p>Decreased tension</p> Signup and view all the answers

    Which neurotransmitter is linked to pleasure and suppressing appetite?

    <p>Dopamine</p> Signup and view all the answers

    How does glutamate affect learning and memory?

    <p>Enhances memory and increases learning</p> Signup and view all the answers

    Which neurotransmitter is primarily involved in pain and pleasure regulation?

    <p>Beta-endorphin</p> Signup and view all the answers

    What is the primary function of homeostasis in biological systems?

    <p>Regulating the body's equilibrium</p> Signup and view all the answers

    Which option describes the process that occurs after the formation of the neural groove and neural tube?

    <p>Neural proliferation</p> Signup and view all the answers

    Which of the following terms refers to the fingerlike cytoplasmic extension that can extend and retract?

    <p>Filopodia</p> Signup and view all the answers

    What is considered the central building block of the nervous system?

    <p>Neurons</p> Signup and view all the answers

    Which system is primarily responsible for conscious perception and voluntary motor responses?

    <p>Somatic nervous system</p> Signup and view all the answers

    Which autoimmune disorder is characterized by symptoms including dizziness and motor control loss?

    <p>Multiple sclerosis</p> Signup and view all the answers

    Which lobe of the brain is primarily associated with reasoning, motor control, emotion, and language?

    <p>Frontal lobe</p> Signup and view all the answers

    What constitutes the complementary functions essential for maintaining homeostasis?

    <p>Nervous and endocrine systems</p> Signup and view all the answers

    Study Notes

    Types of Neurons

    • Sensory neurons activate in response to environmental stimuli, sending signals to the nervous system.
    • Most sensory neurons are pseudounipolar with one axon divided into two branches.
    • Motor neurons connect the central nervous system (CNS) to muscles, glands, and organs, controlling muscle movements.
    • Lower motor neurons travel from the spinal cord to muscles; upper motor neurons connect the brain and spinal cord.
    • Motor neurons are multipolar, featuring one axon and multiple dendrites.
    • Interneurons facilitate communication between sensory and motor neurons, forming complex circuits; they are also multipolar.

    Action Potential

    • Action potential refers to a rapid change in membrane potential, shifting from -70mV to +30mV.
    • Depolarization occurs when sodium ions (Na+) enter the neuron through voltage-gated channels, momentarily reversing polarity to +40mV.
    • Repolarization follows as sodium channels close and potassium channels open, restoring the resting membrane potential.

    Neurotransmitters and Behavior

    • Biological psychology links psychological disorders to neurotransmitter imbalances, with psychotropic medications used to restore balance.
    • Major neurotransmitters include:
      • Acetylcholine: muscle action, memory; effects include increased arousal and cognition.
      • Beta-endorphin: pain and pleasure; can decrease anxiety and tension.
      • Dopamine: mood and learning; linked to increased pleasure and reduced appetite.
      • GABA: brain function and sleep; decreases anxiety and tension.
      • Glutamate: memory and learning; enhances memory and learning capabilities.
      • Norepinephrine: affects heart and alertness; can increase arousal and suppress appetite.
      • Serotonin: mood and sleep; modulates mood and suppresses appetite.

    Neuron Development

    • Neuron migration occurs through somal translocation and glial-mediated processes.
    • Somal translocation involves neuron extensions, while glial-mediated includes glial cells forming barriers for neuron movement.
    • Aggregation ensures neurons align correctly during migration.
    • Axon and dendrite growth is driven by growth cones at their tips, utilizing filopodia to explore environments.
    • The Chemo Affinity Hypothesis posits that chemical signals guide neuron placement during development.

    Neuron Death and Reorganization

    • Neuron death is essential for proper neurodevelopment; abnormal death can lead to cancer.
    • Necrosis is passive cell death; apoptosis is active and safer, preventing harmful inflammation from cell contents leaking.

    Functions of the Nervous System

    • The nervous system performs functions of sensation, integration, and response.
    • Sensation involves receiving stimuli; integration processes information; response includes voluntary (skeletal muscle contraction) and involuntary (smooth muscle and cardiac function) actions.
    • Homeostasis is maintained through complementary actions of the somatic and autonomic nervous systems.

    Divisions of the Nervous System

    • The somatic nervous system (SNS) handles conscious perception and voluntary movements, including reflexes.
    • The autonomic nervous system manages involuntary functions like heart rate and glandular activity.
    • Both systems cooperate to maintain homeostasis, ensuring biological conditions remain optimal.

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    Description

    Dive into the fascinating world of the nervous system with this quiz on sensory and motor neurons. Discover how sensory neurons are activated by environmental stimuli and the role they play in transmitting information. Test your knowledge of neuron types and their functions in the central nervous system.

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