Test_03 - B Action potentials occur only in nerve cells...

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Name: ___________________________________ Date: ______________ 1. What is resting membrane potential? Choose the correct option. A) Difference in electrical charge across the membrane at rest B) Generation and conduction of action potential at rest C) Positive charge inside the membrane with respect to outside at rest D) Isolation of the cytosol from extracellular fluid 2. Which of the following is the major charge carriers involved in the conduction of electricity in neurons? Choose the correct option. A) Anions B) Cations C) Ions D) Ionic bonds 3. How do the lipids of the neuronal membrane contribute to the neuronal membrane potential? Choose the correct option. A) Encourages chemical interactions with water B) Catalyzes chemical reactions C) Integrates cytosol of neuron with extracellular fluid D) Forms a barrier to water-soluble ions and water 4. How do action potentials differ from passively conducted electrical signals? Choose the correct option. A) Action potentials diminish over distance; passively conducted signals do not diminish over distance
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Unformatted text preview: B) Action potentials occur only in nerve cells; passively conducted signals occur only in muscle cells C) Action potentials are transmitted over short distances; passively conducted signals are conducted over long distances D) Action potentials are signals of fixed size and duration; passively conducted signals are not signals of fixed size and duration 5. Which of the following mechanisms decrease intracellular [Ca2+]? Choose the correct option. A) The calcium pump B) Intracellular calcium-binding proteins C) Organelles such as mitochondria and endoplasmic reticulum D) All of the above 6. Which of the following factors determines the ion selectivity of specific ion channels? Choose the correct option. A) Number of protein molecules assembling to form a pore B) Number of ion channels in the membrane C) Nature of the R groups lining the ion channel D) Gating properties 7. Protein shape influences protein function. A) True B) False...
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