Regarding its role as a neurotransmitter in the CNS, norepinephrine
A. is secreted by brainstem neurons in response to sensory stimulation.
B. amplifies weak sensory signals and dampens strong ones so that more information can reach conscious levels.
C. is important for maintaining directed attention.
D. both "is secreted by brainstem neurons in response to sensory stimulation" and "is important for maintaining directed attention" are correct.
E. All of the choices are correct.
D
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Which statement best describes enzyme function?
A) Enzymes chemically alter both the reactants and products. B) Enzymes speed chemical reactions by lowering the activation energy. C) Enzymes can perform catabolic reactions only. D) One enzyme can work on thousands of different substrates.
Which of the following is supportive for men aged forty to fifty with reduced libido?
A) melatonin B) glutathione C) Ginko biloba D) DHEA
Regions of the stomach include all of the following except
A) cardia. B) body. C) pylorus. D) ileum. E) fundus.
Which statement is false?
A) Pulmonary veins carry oxygenated blood. B) The pulmonary circuit ends in the left atrium. C) Gas exchange takes place in the capillary beds. D) The pulmonary trunk splits to form the right and left pulmonary veins.