Biopsychology PSYC 222 Course Overview
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Questions and Answers

What is the role of the sodium-potassium pump in the neuron?

  • It opens voltage-gated channels, allowing sodium ions to enter the neuron.
  • It actively transports sodium ions out of the neuron and potassium ions into the neuron. (correct)
  • It closes voltage-gated channels, preventing sodium ions from entering the neuron.
  • It passively allows sodium ions to enter the neuron and potassium ions to exit.
  • During the absolute refractory period, what prevents the neuron from firing another action potential?

  • The sodium channels are open and actively transporting sodium ions into the cell.
  • The neuron has not reached threshold yet, so it cannot fire an action potential.
  • The sodium channels are closed and inactive, preventing sodium ions from entering the cell. (correct)
  • The potassium channels are closed, preventing potassium ions from leaving the cell.
  • What is the primary source of nourishment for vertebrate neurons?

  • Glucose (correct)
  • Proteins
  • Lipids
  • Amino Acids
  • What is the function of the myelin sheath in nerve cells?

    <p>It increases the speed of action potential propagation by allowing the action potential to jump from one node of Ranvier to the next. (B)</p> Signup and view all the answers

    What is the difference between the absolute refractory period and the relative refractory period?

    <p>During the absolute refractory period, the neuron cannot fire an action potential, while during the relative refractory period, the neuron can fire an action potential if the stimulus is strong enough. (B)</p> Signup and view all the answers

    Which of the following ions is actively pumped out of the neuron by the sodium-potassium pump?

    <p>Sodium (A)</p> Signup and view all the answers

    How does the action potential move down the axon?

    <p>It jumps from one node of Ranvier to the next. (A)</p> Signup and view all the answers

    What is the term for the difference in electrical charge inside and outside of a neuron at rest?

    <p>Polarization (B)</p> Signup and view all the answers

    What is the approximate millivolt value of a neuron's resting potential?

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

    Which of the following is essential for maintaining the electrical gradient across the neuron's membrane?

    <p>The sodium-potassium pump (D)</p> Signup and view all the answers

    What is the primary function of the blood-brain barrier?

    <p>Protecting the brain from potentially harmful substances (D)</p> Signup and view all the answers

    What is the term for the state of a neuron before a nerve impulse is sent?

    <p>Resting potential (B)</p> Signup and view all the answers

    Which of the following is NOT a consequence of the blood-brain barrier's protective function?

    <p>Increased risk of infection in the brain (C)</p> Signup and view all the answers

    What is one of the main ethical considerations in research involving humans?

    <p>Ensuring a diverse sample of participants (A)</p> Signup and view all the answers

    Which aspect is not one of 'the three Rs' in animal research ethics?

    <p>Rehabilitation of all animals involved (D)</p> Signup and view all the answers

    What significant contribution did Santiago Ramón y Cajal make to neuroscience?

    <p>He proved that individual neural cells remain separate (A)</p> Signup and view all the answers

    Why might studying nonhuman species provide insights into human evolution?

    <p>Mechanisms of behavior can be similar across species (A)</p> Signup and view all the answers

    Which of the following statements about research findings is most accurate?

    <p>Research findings predominantly come from North America or Europe (D)</p> Signup and view all the answers

    What is the primary focus of biological psychology?

    <p>Understanding physiological mechanisms of behavior (B)</p> Signup and view all the answers

    Which of the following categories does NOT represent a biological explanation of behavior?

    <p>Psychosocial (A)</p> Signup and view all the answers

    Which ethical issue is NOT mentioned as a dispute in neuroethics?

    <p>Euthanasia (B)</p> Signup and view all the answers

    What is the primary function of a motor neuron?

    <p>To receive excitation from other neurons and send signals to muscles or glands (A)</p> Signup and view all the answers

    Which glial cell type is responsible for forming myelin sheath in the peripheral nervous system?

    <p>Schwann cells (B)</p> Signup and view all the answers

    What is the primary role of the dendrites in a neuron?

    <p>Receive information from other neurons (D)</p> Signup and view all the answers

    Which option best describes hyperpolarization?

    <p>The process where the membrane potential becomes more negative than the resting potential (A)</p> Signup and view all the answers

    What does the blood-brain barrier primarily serve to do?

    <p>Protect the brain from harmful chemicals and pathogens (C)</p> Signup and view all the answers

    Which structure of the animal cell is primarily involved in energy production?

    <p>Mitochondrion (C)</p> Signup and view all the answers

    What is the main function of interneurons?

    <p>To connect motor and sensory neurons (A)</p> Signup and view all the answers

    What characterizes resting potential in a neuron?

    <p>The inside of the neuron is more negatively charged compared to the outside (B)</p> Signup and view all the answers

    Flashcards

    Attendance Policy

    Mandatory attendance with specific absence limits (9 or 11) leading to an 'F'.

    Use of Devices

    Laptops are required for classwork, assessments, and exams; cellphones must be silenced.

    Plagiarism Rules

    All submissions must be original; plagiarism will be reported.

    AI Tools Usage

    AI may be used as a tool, but submissions must be in your own words.

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    Course Materials

    Lecture materials, presentations, and activities are available on MyCourses.

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    Three Rs in Research

    Legal standard for ethical animal research: Reduction, Replacement, Refinement.

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    Neuroethics

    Field addressing ethical issues in neuroscience research involving human and animal subjects.

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    Santiago Ramón y Cajal

    Pioneer of neuroscience; demonstrated that individual nerve cells are separate entities.

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    Golgi Stains

    Method used to visualize individual neural cells in scientific research.

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    Ethical Concerns in Human Research

    Research involving humans raises unique ethical issues, including consent and representation.

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    Threshold

    The level of stimulation required to trigger an action potential in a neuron.

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    Absolute refractory period

    The time during which a neuron cannot fire another action potential, regardless of stimulation.

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    Relative refractory period

    The period during which a neuron can fire another action potential only if the stimulus is strong enough.

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    Myelin sheath

    An insulating layer around axons that speeds up electrical transmission.

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    Saltatory conduction

    The jumping of action potentials from node to node along a myelinated axon.

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    Central nervous system

    The part of the nervous system consisting of the brain and spinal cord.

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    Neuron

    A specialized cell that transmits nerve impulses.

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    Axon

    The part of a neuron that carries impulses away from the cell body.

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    Synapse

    The junction between two neurons where communication occurs.

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    Depolarization

    The process during the action potential when the membrane potential becomes less negative.

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    Blood–Brain Barrier

    A selective barrier that protects the brain from harmful substances.

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    Glial cells

    Supportive cells in the nervous system that provide functions like waste removal and insulation.

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    Cengage Textbook

    A mandatory resource for the course, contains essential material.

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    MyCourses Platform

    Online hub for lecture material, grades, and attendance.

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    Homework Assignments Weight

    Homework contributes 10% to your overall course grade.

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    Quizzes Structure

    5 total quizzes, with the top 4 counting for 20% of the grade.

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    Biological Psychology

    Study of how biological factors influence behavior and experience.

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    Physiological Explanation

    Links behavior to brain activity and organ functions.

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    Ethics in Neuropsychology

    Debates surrounding issues like animal use in research.

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    Categories of Biological Explanations

    Include physiological, ontogenetic, evolutionary, and functional.

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    Blood-Brain Barrier

    A protective barrier that blocks harmful substances from entering the brain.

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    Active Transport

    The process of moving substances into the brain requiring energy.

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    Resting Potential

    The state of a neuron when not actively sending a signal, usually around -70 mV.

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    Sodium-Potassium Pump

    A protein complex that moves sodium out and potassium into the cell.

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    Electrical Gradient

    The difference in electrical charge across a neuron's membrane.

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    Neuronal Stimulation

    The process where a neuron's resting potential is disturbed to initiate action potential.

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    Action Potential

    A rapid change in electrical charge that travels along the neuron.

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    Nutrient Dependence

    Vertebrate neurons mainly rely on glucose for energy.

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    Study Notes

    Course Information

    • Course: Biopsychology (PSYC 222)
    • Attendance: Mandatory, 9 absences (twice weekly) or 11 (three times weekly) result in an "F"
    • Laptops: Mandatory for classwork, assessments, and exams
    • Cell phones: Must be on silent and out of sight, except when used for activities
    • Drinks: Allowed; food and feet are not
    • Artificial Intelligence: Allowed for use as a tool, but plagiarism is strictly prohibited.

    Expectations

    • Plagiarism will result in disciplinary action, reported to the university.
    • All submissions must be original work.

    Course Requirements

    • Lecture material: Presentations, videos, and activities available on MyCourses
    • Resources: Cengage textbook (mandatory), laptop (mandatory)
    • Platforms: MyCourses (lecture material, course info, attendance, grades), Cengage (textbook, homework, assignments, activities)

    Assessment Details

    • Homework Assignments: 5 activities (30 minutes each), worth 10% of the course grade, accessible through Cengage
    • In-Class Assignments: 5 pair/group assignments, worth 10% of the course grade, original submissions required
    • Quizzes: 5 quizzes (top 4 scores count), worth 20%
    • Midterm Exam: 1 exam, worth 30%
    • Final Exam: 1 exam, worth 30%

    Detail of Assessments

    • Homework Assignments: 5, Value 2 points, Weight 10%, Completion grade
    • Quizzes: 4, Value 5 points, Weight 20%, Score grade (5 offered; lowest dropped)
    • In-Class Assignments: 5, Value 2 points, Weight 10%, Completion grade
    • Midterm: 1, Value 30, Weight 30%, Score grade
    • Final: 1, Value 30, Weight 30%, Score grade
    • Total: 100

    Introduction

    • All psychology is biological.
    • Biological psychology studies the evolutionary and developmental mechanisms of behavior and experience.
    • Cultural, social, and cognitive influences, genetics, evolution, hormones, body physiology, and brain mechanisms are involved.

    Biological Explanations of Behavior

    • Physiological: Explains behavior by relating it to the brain and other organs.
    • Ontogenetic: Describes how behavior develops.
    • Evolutionary: Reconstructs the evolutionary history of a behavior.
    • Functional: Explains why a behavior evolved.

    Neuroethics

    • Several ethical disputes exist, including abortion and animal use.
    • Biological psychologists study nonhumans when behaviour mechanisms are similar across species or when it's easier to study in a nonhuman species, to learn about human evolution (animal studies), and when legal or ethical restrictions prevent certain research on humans
    • The legal standard emphasizing the "three Rs": reduction, replacement, refinement.

    Neuroscience

    • Santiago Ramón y Cajal (1852-1934): Spanish investigator who demonstrated that individual nerve cells in the nervous system are separate. Golgi initially believed the nervous system is one continuous network.

    Knowledge Check

    • Lists of different nervous system components

    Animal Cell Structures

    • Membrane, Nucleus, Mitochondria, Ribosomes, Endoplasmic Reticulum

    Neuron Structure and Function

    • Motor neuron function in spinal cord
    • Sensory neuron functions
    • Interneurons function in the spinal cord)
    • Afferent axon brings information; efferent axon carries away information

    Glial Cells

    • Astrocytes: Pass chemicals between neurons and blood
    • Microglia: Remove waste, viruses, fungi, and dead/damaged neurons
    • Oligodendrocytes and Schwann cells: Build myelin sheath that surrounds/insulates certain axons
    • Radial glia: Guide neuron migration/growth during embryonic development

    Blood-Brain Barrier

    • A mechanism that surrounds the brain and blocks most chemicals from entering.
    • The immune system doesn't effectively destroy damaged or infected cells in the brain due to the blood-brain barrier.
    • Active transport is involved in pumping necessary chemicals (glucose, hormones, amino acids, etc.) into the brain.

    Nourishment of Vertebrate Neurons

    • Vertebrate neurons depend almost entirely on glucose.
    • Glucose is one of the few nutrients that pass through the blood-brain barrier; allows visualization via PET scans
    • Neurons need a steady supply of oxygen (20% of all oxygen consumed by the body)

    Action Potential

    • The resting potential remains stable until the neuron is stimulated.
    • Threshold, all-or-none law, depolarization, repolarization, hyperpolarization, absolute/relative refractory periods are key concepts.

    Molecular Basis of the Action Potential

    • Sodium ions are mostly outside, while potassium ions are inside, due to the sodium–potassium pump.
    • Depolarization opens sodium/potassium channels, which draw the positive ions into the cell.
    • At the peak of the action potential, sodium channels close.

    Propagation of Action Potential

    • Action potential starts at axon hillock.
    • Action potential transmission occurs along the axon, not by directly traveling down the axon
    • Neurons experience absolute and relative refractory periods during this process.

    The Myelin Sheath

    • Myelin sheaths of axons are interrupted by short unmyelinated sections called nodes of Ranvier.
    • Myelin is an insulating material composed of fats and proteins
    • Action potentials are regenerated at nodes of Ranvier, resulting in "jumping" of impulses along the axon.

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    Description

    This quiz covers the essential information and expectations for the Biopsychology course (PSYC 222). Students will be tested on attendance policies, required materials, and assessment details. Understanding these guidelines is vital for success in the course.

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