The countercurrent multiplier is a system by which the
A. vasa recta secretes multiple amounts of metabolic wastes against their concentration gradient.
B. nephron loop multiplies the concentration of salts in the interstitial fluid of the kidney medulla.
C. vasa recta becomes more concentrated with nitrogenous wastes than the urine.
D. nephron loop dilutes the concentration of solutes in the tubular fluid at its hairpin turn.
Answer: B
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The lobe that is immediately posterior to the central sulcus and that is involved in general sensory functions is the
A. occipital lobe. B. temporal lobe. C. insula. D. parietal lobe. E. frontal lobe.
What do geniohyoid, hyoglossus, and stylohyoid have in common?
A) All names reflect direction of muscle fibers. B) Each acts synergistically to elevate the jaw. C) All act on the tongue. D) All names indicate the relative size of the muscle.
The hyoid bone is located between the
A. mandible and the larynx. B. maxilla and the mandible. C. pharynx and the nasal cavity. D. cranium and the axilla. E. larynx and the trachea.
When the fulcrum is located between the load and the force, it is called a ________ lever
A) first-class B) second-class C) third-class D) fourth-class E) compound