How long does it take the average meal to be completely absorbed?
a. 4 hours
b. 6 hours
c. 12 hours
d. 18 hours
e. 24 hours
a
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Polysynaptic reflex arcs differ from monosynaptic reflex arcs in that the former have ________, which are not present in the latter.
Fill in the blank(s) with the appropriate word(s).
The alveolar wall is ____________________ (how many?) cell layer(s) thick. The wall of the pulmonary capillaries surrounding an alveolus is cell ____________________ (how many?) layer(s) thick
Fill in the blank(s) with correct word
Which choice lists structures in order of increasing size?
A. nitrogenous base - nucleotide - gene - chromosome - genome B. cell - organelle - tissue - organ C. genome - nucleus - chromosome - nucleotide - gene D. nitrogenous base - nucleotide - gene - genome - chromosome
During fasting, ketones produced by the liver:
A. are a waste product of amino acid metabolism that the kidneys must excrete. B. can be used by the brain as an energy source. C. are a by-product of anaerobic metabolism. D. are converted to fatty acids and released into the blood. E. are used to synthesize glucose by gluconeogenesis.