The only point of electrical contact between the atria and the ventricles is the AV node
Indicate whether the statement is true or false
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Accommodation for near vision requires:
A. flattening of the lens. B. contraction of the ciliary muscles. C. activation of the sympathetic nervous system. D. increased rounding of the cornea. E. dilation of the pupil.
Compartments A and B are separated by a membrane that is permeable to K+ but not to Na+ or Cl-. At time zero, a solution of KCl is poured into compartment A and an equally concentrated solution of NaCl is poured into compartment B. Which would be true once equilibrium is reached?
A. Diffusion of K+ from A to B will be greater than the diffusion of K+ from B to A. B. The electrical potential difference and diffusion potential due to the concentration gradient for K+ will be equal in magnitude and opposite in direction. C. The concentration of Cl- will be higher in B than it was at time zero. D. The concentration of Na+ in A will be higher than it was at time zero. E. There will be a potential difference across the membrane, with side B negative relative to side A.
Exhalation begins when
a) Inspiratory muscles relax b) Diaphragm contracts c) Blood circulation is the lowest d) Both Inspiratory muscles relax and Diaphragm contracts e) All of these choices
Which back muscle inserts on the ribs and vertebrae?
A. erector spinae B. longissimus capitis C. interspinales D. multifidus E. psoas minor