General Physiology

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Author:
Marine
ID:
302257
Filename:
General Physiology
Updated:
2015-06-11 23:43:13
Tags:
physiology physio
Folders:
Physio
Description:
General Physiology
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  1. When a molecule moves across the plasma membrane by active transport,
    A. it always moves against the concentration gradient
    B. it moves in opposite direction than water
    C. its movement depends on its metabolic change
    D. its energy grows
    D. its energy grows
    (this multiple choice question has been scrambled)
  2. All active transport theories assume
    A. binding of the transported molecule to an element of plasma membrane
    B. presence of uni-directional channels
    C. the influence of a humoral control
    D. the influence of a cortical control
    E. the presence of a transporter molecule
    A. binding of the transported molecule to an element of plasma membrane
    (this multiple choice question has been scrambled)
  3. What is not a property of neuronal plasma membrane?
    A. Its excitability is different in different parts of a neurone.
    B. It doesn't have a refractory period.
    C. Permeability for K+
    D. It is very little permeable for Na+ in the resting state.
    E. The maintaining of a concentration gradient of ions across the plasma membrane is independent of energy metabolism.
    B. It doesn't have a refractory period.
    (this multiple choice question has been scrambled)
  4. The change of relative permeability of plasma membrane for sodium causes the change of all the following phenomena except:
    A. resting potential
    B. cell volume
    C. intracellular concentration of Na+ 
    D. resting equilibrium potential
    E. excitability
    D. resting equilibrium potential
    (this multiple choice question has been scrambled)
  5. Most cells in the human body in equilibrium maintain high intracellular concentration of K+ and low intracellular concentration of Na+. Which phenomenon is responsible for this ion asymmetry the most?
    A. The threshold membrane potential maintains the ion difference.
    B. The difference is caused by the activity of the sodium-potassium pump and resting membrane permeability.
    C. The plasma membrane is more permeable for K+ than for Na+ at rest.
    D. Na+ and K+ are of different sizes after hydration.
    E. The difference is caused by the intracellular osmotic pressure.
    B. The difference is caused by the activity of the sodium-potassium pump and resting membrane permeability.
    (this multiple choice question has been scrambled)
  6. Diffusion is best described as a(n)
    A. active process iagainst the concentration gradient
    B. active process concerning only substances with low molecular weight
    C. active or passive process whose speed is exclusively determined by the surface of the membrane on which the diffusion is going on
    D. passive process down the concentration gradient
    E. process driven by pressure, such as blood pressure and surface tension
    D. passive process down the concentration gradient
    (this multiple choice question has been scrambled)
  7. Which of these items can be described as "all-or-none"?
    A. force of muscle contration
    B. resting potential
    C. amount or neurotransmitter released
    D. EPSP (excitatory postsynaptic potential)
    E. action potential 
    E. action potential
    (this multiple choice question has been scrambled)
  8. Excitable cells (neurones and myocytes) differ from other cells by:
    A. having an electrical membrane
    B. being able to generate fast and transient changes for sodium permeability
    C. having an ion concentration gradient across the plasma membrane
    b. having active transport mechanisms on their membranes
    e. the fact that their membrane is affected by electric current
    B. being able to generate fast and transient changes for sodium permeability
    (this multiple choice question has been scrambled)
  9. This is true for the so-called sodium-potassium pump:
    A. speed of sodium transport is independent of its intracellular concentration
    B. macroergic phosphates allow the activity of the sodium-potassium pump
    C. its function does not depend on temperature
    D. it is a mechanism of sodium diffusion
    E. activity of the Na+-K+-pump is independent of K+ influx
    B. macroergic phosphates allow the activity of the sodium-potassium pump
    (this multiple choice question has been scrambled)

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