Molecules that serve as chemical signals to open or close gated ion channels are ________.
A. communicators
B. isotopes
C. membrane potentials
D. ligands
E. responders
Answer: D
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Dave has diabetes mellitus. Which of the following describes how the disease affects his bodily fluids?
A. He excretes protein in his urine. B. He urinates less than the average person. C. His blood sugar is generally low when untreated. D. His urine is of high osmotic pressure.
Mammary glands exhibit a glandular type called ________.
A) simple tubular B) compound tubular C) simple alveolar D) compound alveolar
Teeth in adults
A. are replaced by osteoblast activity if they are extracted. B. are composed of living cells called enamel cells. C. are all of the same type-molars. D. are distributed so that there is one canine tooth in each half jaw. E. do not play a role in speech.
Marfan syndrome is a genetic disorder associated with ________ tissue.
A. epithelial B. nervous C. connective D. muscular E. All choices are correct.