You are sitting by the pool in your bathing suit. There is no wind, and you feel quite warm. After a brief swim, you exit the pool to discover that someone stole your towel. Moreover, the wind is blowing, and you feel very cold. Compare and define the
processes of heat loss from the skin that are occurring before and after your swim.
What will be an ideal response?
Before the swim, heat is being lost from the skin by conduction, which is the transfer of heat from the skin to the surrounding air. After the swim, conduction is still occurring. The skin is wet; thus, evaporation of water will contribute to heat loss. The wind will cause more heat to be lost by convection, in which moving air carries additional heat away from the skin.
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Choose the correct statement regarding motor units.
A) Muscle fibers of each motor unit are not mingled with those of other motor units. B) During a sustained contraction, all motor units are activated simultaneously. C) A motor neuron may control only two or three muscle fibers of the eye muscle(s). D) When muscles contract for sustained periods, maximal tension is maintained. E) Most motor neurons control fewer than five muscle fibers.
Which of the following produces secretions with mostly buffers and mucus, but few enzymes?
A) parotid and submandibular salivary glands B) parotid salivary glands only C) sublingual and parotid salivary glands D) submandibular and sublingual salivary glands E) pancreas and parotid salivary glands
Which of the following muscles does NOT adduct the thigh?
A) pectineus B) rectus femoris C) gracilis D) adductor magnus
Most congenital birth defects are caused by
A. inherited traits. B. lack of oxygen to the fetus. C. viral infections during pregnancy. D. unknown causes. E. None of these choices is correct.