Degeneration of the neurons in which of the following structures leads to the muscle tremors associated with Parkinson disease?
A. Cerebral crus
B. Tegmentum
C. Pons
D. Substantia nigra
E. Inferior colliculi
D. Substantia nigra
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This is a figure of a skin wound. What does "B" represent?
A. Blood clot B. Epidermis C. Blood vessel D. Subcutaneous adipose tissue E. Dermis
Which ions are critical for the activation of some enzymes?
A) magnesium ions B) fluorine ions C) potassium ions D) chlorine ions
A sodium bicarbonate solution is secreted in response to a hormone called ________.
A. secretin B. gastrin C. cholecystokinin (CCK) D. glucagon E. insulin
An infection may occur in a tissue injury. Why?
a. The skin and mucous membranes are body's first line of defense, and are mostly impenetrable to microorganisms unless broken. b. The increased availability of nutrients allows microorganisms to replicate. c. Once microorganisms gain entry to the body through a wound, they will always cause an infection. d. The increased availability of nutrients allows microorganisms to replicate. The skin and mucous membranes are body's first line of defense and are mostly impenetrable to microorganisms, unless broken or damaged by tissue injury.