Select the statement below that is not true with regards to the process of light adaptation
A) Visual acuity is diminished.
B) Retinal sensitivity decreases.
C) Rhodopsin is uncoupled from light transduction.
D) The activity of rods is reduced by rapid bleaching of rhodopsin.
A
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Which of the following most accurately describes a motor unit?
A. a single muscle fiber and a single motor neuron B. a single motor neuron and all muscle fibers it innervates C. a single muscle fiber and several motor neurons D. none of the above
Which of the following statements is a false or incorrect statement?
A) The lymphoid organs where lymphocytes become immunocompetent are called primary lymph organs. All other lymphoid organs are referred to as secondary lymphoid organs. B) After becoming immunocompetent, the naive T cells and B cells are exported to the bone marrow where the encounters with antigens occur. C) It is our genes, not antigens, that determine what specific foreign substances our immune system will be able to recognize and resist. D) T cells and B cells become activated when they bind with recognized antigens.
The medical term for incoordination or stumbling is:
A) seizure B) ataxia C) plegia D) neuritis
During an action potential in muscle, ________
A) both Na+ and K+ diffuse into the cell B) K+ diffuses into the cell, then Na+ diffuses out C) Na+ diffuses into the cell, then K+ diffuses out D) both Na+ and K+ diffuse out of the cell