Variations in eye color are determined by the number of pigmented cells in the:
a. Ciliary epithelium
b. Corneal epithelium
c. Corneal stroma
d. Iris epithelium
e. Iris stroma
ANS: E
Variations in the activity and number of melanocytes in the stroma of the iris account for varia-tions in eye color.
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Which of the statements below does not describe antigens?
A) Antigens exhibit immunogenicity and reactivity. B) Antigens only come from microbes. C) The parts of antigen molecules that initiate immune responses are called epitopes or antigenic determinants. D) Antigens can include proteins, nucleic acids, lipoproteins, glycoproteins, and certain large polysaccharides.
Matching
A) Mucous membrane B) Serous membrane C) Cutaneous D) Endothelium 11) The epithelial membrane that lines the closed ventral cavities of the body. 12) The epithelial membrane that lines body cavities open to the exterior membrane. 13) Consists of keratinized stratified squamous epithelium. 14) Found lining the digestive and respiratory tracts. 15) Makes up the pleura and pericardium. 16) Lines blood vessels and the heart.
The most effective chemical buffer in ECF is
a. hemoglobin. b. peptide buffers. c. carbon dioxide-bicarbonate buffers. d. phosphate buffers. e. Lactate buffers.
The cranial nerve that supplies parasympathetic innervation to the thoracic organs is
A. CN X. B. CN II. C. CN VI. D. CN III. E. CN IX.