Which of the following statements concerning the dorsal respiratory group (DRG) is correct?
a. the DRG consists of both inspiratory neurons and expiratory neurons.
b. the neurons of the DRG remain inactive during normal quiet breathing.
c. the DRG is called into play by the VRG as when demands for ventilation are increased.
d. is found within the brainstem
e. none of these answers.
D
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In the final step in the blood clotting process:
a. prothrombin reacts with fibrin to form fibrinogen b. thrombin reacts with fibrinogen to form fibrin c. prothrombin reacts with fibrin to form fibrinogen d. prothrombin activator reacts with prothrombin to form thrombin
What protein is present in large amounts in connective tissue proper?
A. Enamel B. Collagen C. Keratin D. Mucin
The ____________________ environment is the surrounding environment in which an organism lives
Fill in the blank(s) with correct word
A positive feedback loop is necessary in which of the following situations?
A. Blood pressure B. Coughing C. Bleeding D. Childbirth