The most important stimulus in the control of respiration is the concentration in the blood and other body fluids of
a. oxygen (O2).
b. carbon dioxide (CO2).
c. hydrogen ions (H+).
d. nitrogen (N2).
c
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Severe vomiting or dehydration and overuse of antacids may bring about which condition?
a. metabolic alkalosis b. respiratory acidosis c. metabolic acidosis d. respiratory alkalosis e. compensatory acidosis
The "thermal death point" is the lowest temperature required to kill all microbes in a sample in 10 minutes.
a. true b. false
If a dehydrated seed must re-imbibe water in order to germinate, what is the advantage of drying out to begin with?
A. Lighter in weight to facilitate dispersal B. Ensures germination only when conditions are good C. Protects seeds from freezing to death D. To improve transfer of material from
A collection of sensory neurons and interneurons that are concentrated together is called
a) cephalization b) a cerebrum c) a nerve net d) a ganglion