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Ch 10+11 quiz

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  • The functional unit of a skeletal muscle contraction, consisting of one motor neuron an all the muscle fibers it innervates

    Motor Unit

  • The supply of nerves to a specific body part or tissue

    Innervation

  • What are the components of thin filament

    Actin

    Troponin

    Tropomyosin

  • What are the components of thick filament

    Myosin

  • invaginations of the sarcolemma that facilitate the movement of sodium ions into the center of the muscle fiber

    Transverse Tubules

  • During contraction the _____ move closer together as the sarcomere shortens

    Z-discs

  • ______ Conduction is significantly faster than _______ Conduction

    Saltatory , Continuous

  • Continuous conduction occurs in ______ axons, where the axon must travel along every point of the membrane, a process that is slow and energy consuming

    unmyelinated

  • ______ Conduction occurs in myelinated axons. The myelin sheath acts as an insulator, allowing the electrical impulse to "jump" from one Node of Ranvier to the next

    Saltatory

  • What is one type of neurogical cell

    Astrocyte

  • Where is the astrocyte found

    In the central nervous system

  • What is the primary function of the astrocyte

    to maintain the blood-brain barrier by wrapping its cellular processes around capillaries, this allows it to regulate the chemical environment of the brain, nourish neurons, and protect the nervous system from potentially harmfulk substances in the blood

  • The ____ stroke occurs when the brain sends post and pull action toward the center of the brain cells

    Inward

  • Carries signals from receptors in the skin, muscles, bones, joints, and special sense organs

    Somatic Sensory

  • Carries signals from the viscera

    Visceral Sensory

  • Carries signals to skeletal muscles

    Somatic Motor

  • Carries signals to glands, cardiac muscle, and smooth muscle

    Visceral Motor

  • What is a the name of the electrical signal that travels down a neuron and causes neurotransmitters to be released into the synapse

    Pulse

  • Which statement best describes the all-or-none principle of action potentials

    An action potential fires completely or it doesn't happen at all

  • The neuron that contains receptors for the neurotransmitter at a synapse is the _____

    the postsynaptic neuron

  • ____ _____ are rare and almost exclusively associated with ___ ____ ____

    Bipolar Neurons, Special sense organs

  • What is the contractile protein in thin filament

    Actin

  • What are the Regulatory proteins in thin filament

    Tropomyosin and troponin

  • Explain the different parts of thin filaments

    Actin- the contractile protein that has the binding sites on it

    Tropomyosin- the thread like protein that covers the binding sites of the actin

    Troponin- The protein that holds tropomyosin in place and also moves it to allow myosin to bind to the actin