The relative refractory period of an axon coincides with the period of
A. activation and inactivation of voltage-dependent Na+ channels.
B. Na+ permeability that is greater than that during the depolarization phase.
C. increased K+ flux into the cell.
D. increased K+ permeability of the cell.
E. Increased Na+ flux through K+ channels.
D
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In the body's lever systems, the fulcrums are represented by the
a. joints. b. long bones. c. tendons. d. short bones. e. skeletal muscles.
The function of the chordae tendinae is to:
anchor the aortic valve flaps and prevent backflow into the ventricles anchor the semilunar valve flaps and prevent backward flow of blood into the ventricles anchor the bicuspid valve flaps and prevent backflow of blood into the ventricle anchor the AV valve flaps and prevent backflow of blood into the atria none of the choices are correct
What statement best describes tidal volume?
A) Tidal volume is the air exhaled after normal inspiration. B) Tidal volume is the air remaining in the lungs after forced expiration. C) Tidal volume is the air forcibly expelled after normal expiration. D) Tidal volume is the air exchanged during normal breathing.
What is another name for voice box?
A. Pharynx B. Larynx C. Epiglottis D. Trachea