The gastrointestinal tract lining changes along its length. Choose one section of the tract that has a simple epithelium and one section that has a stratified epithelium,
and for each section describe the specific epithelium present and how that type of epithelium suits the organ's function.
What will be an ideal response?
A variety of answers are possible, but an obvious example follows. The oral cavity and pharynx have stratified squamous epithelium to contend with the friction of the food that is ingested. The small intestine has a simple columnar epithelium with many secretory cells; this epithelium is thin and has many microvilli (large surface area) to allow for efficient absorprtion and secretion.
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________ ions help to regulate the pH of saliva.
Fill in the blank(s) with the appropriate word(s).
True or False? -oid is a prefix meaning resembling. Select one:
a. true b. false
A collection of nerve cell bodies within the central nervous system is a:
a. ganglion b. nucleus c. tract d. plexus
During brain surgery, the superior portion of the primary somatic sensory cortex of a patient is stimulated. The patient is most likely to
A. talk to the surgeon. B. smile. C. feel something touching his back. D. wiggle his toes. E. flex his fingers.