Osmosis is the movement of
A) water molecules from a high concentration to a low concentration through a
selectively permeable membrane.
B) ions from a low pressure region to a high pressure region through a selectively
permeable membrane.
C) water molecules from a low concentration to a high concentration through a
selectively permeable membrane.
D) molecules from a high concentration to a low concentration.
A
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Smokers are more susceptible to respiratory infections because
A. they congregate in small areas to smoke. B. the respiratory passages have too little mucus. C. their respiratory passages lose cilia, which would otherwise remove bacteria. D. their respiratory passages overproduce cilia, to which bacteria cling.
The epidermis consists of five layers of cells, each layer with a distinct role to play in the health, well-being, and functioning of the skin. Which of the following layers is responsible for cell division and replacement?
A) stratum corneum B) stratum granulosum C) stratum basale D) stratum lucidum
Which of the following statements concerning receptor potentials is correct? Receptor potentials
a. are usually depolarizations of receptors in response to adequate stimuli. b. are graded potentials. c. occur in neuronal cell bodies upon summation of pre synaptic input. d. both (a) and (b) above. e. all of these answers.
The initial site of both mechanical and chemical digestion is the
A. oral cavity. B. small intestine. C. pharynx. D. stomach. E. esophagus.