Why can one say that chemical digestion begins in the mouth?
A. The teeth grind food to expose surface area for enzymatic action.
B. The saliva contains lysozyme.
C. The saliva contains mucus.
D. The saliva contains electrolytes.
E. The saliva contains amylase and lipase.
E. The saliva contains amylase and lipase.
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Which best describes the specific cause of Parkinson's disease?
A. Reduced ability of neurons in the substantia nigra to release dopamine B. Failure of serotonin receptors to bind with these neurohormones C. Hyperactivity of metabolic enzymes that degrade dopamine D. Natural tendency of basal nuclei to follow a daily recurring, oscillating cycle of rising and falling norepinephrine release E. Enhanced sensitivity of cholinergic receptors to acetylcholine
The functional units of DNA that contain the instructions for making one or more proteins are
A) chromosomes. B) genes. C) ribosomes. D) codons. E) RNA.
Which of the following is not a role of complement in the immune system
a. increasing the permeability of blood vessels b. attracting immune cells to the site of infection c. marking foreign cells for destruction d. all of the above are roles of complement in the immune system
Sympathetic stimulation of cardiac muscle cells produces stronger and faster contractions because proteins that pump Ca2+ out of the cell are inhibited, which reduces Ca2+ concentration in the sarcoplasm
Indicate whether the statement is true or false.