The primary germ layer that gives rise to the epidermis, brain, and spinal cord is the __________.
Fill in the blank(s) with the appropriate word(s).
ectoderm
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What do the ductus arteriosus and the foramen ovale become at birth?
A) ligamentum arteriosum; fossa ovalis B) ligamentum teres; fossa ovalis C) fossa ovalis; ligamentum arteriosum D) ligamentum arteriosum; ligamentum teres
A reduction division is one in which
A. one daughter cell is substantially reduced in size compared to the parent cell. B. the chemical reactions of oxidation and reduction take place. C. the size of chromosomes is reduced from double-stranded to single-stranded. D. the daughter cells receive only half as many chromosomes as the parent cell had.
A 38-year-old man with a history of "heartburn" suddenly experiences excruciating pain in the epigastric region of his abdomen. Surgery is performed immediately, and evidence of a perforated ulcer in the posterior wall of the stomach is noted. Stomach contents that have seeped out will most likely be found in which of the following structures?
A. Between the parietal peritoneum and the posterior body wall B. Greater peritoneal sac C. Ischioanal fossa D. Lesser peritoneal sac E. Paracolic gutter
Muscle spindles are ________ receptors and cause reflex ________, whereas Golgi tendon organs respond primarily to ________ and cause a ________ reflex.
Fill in the blank(s) with the appropriate word(s).