Which imaging technique is used to diagnose osteoporosis?
A. Magnetic resonance imaging (MRI)
B. Computed tomography (CT)
C. Ultrasound
D. Dual-energy X-ray absorptiometry (DEXA)
E. Positron emission tomography (PET)
Answer: D
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During the initial, depolarizing phase of the action potential, the voltage-gated Na+-channel is in which conformation?
a. closed but capable of opening b. open, or activated c. closed and not capable of opening d. activation gate open; inactivation gate closed e. activation gate closed; inactivation gate closed
In the inflammatory response, clotting proteins form a clot. This action
A. produces edema. B. walls off foreign particles and microbes. C. increases the permeability of blood vessels. D. phagocytizes microbes. E. stimulates pain receptors.
The adrenal medulla is a modified sympathetic ganglion that, like other postganglionic neurons, releases epinephrine onto a target tissue.
Answer the following statement true (T) or false (F)
What is the name for a biological catalyst?
A) enzyme B) active site C) polysaccharide D) substrate