Once a scab has formed, what happens next?
A. the scab sloughs off.
B. fibroblasts from the wound edge form new collagenous fibers.
C. blood vessels send out new branches under the scab.
D. phagocytic cells remove dead material.
Answer: B
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Which vessels collect deoxygenated blood from the myocardium?
A) coronary arteries B) cardiac veins C) atrial arteries D) marginal arteries
The neurotransmitter released from the axon terminal ________
A) may excite or inhibit the next cell depending on which receptors for the neurotransmitter are present B) excites the next cell C) inhibits the next cell D) varies in its effect, depending on the shape of the action potential
Place the following steps in the correct order for transduction of a chemical odorant into a nerve signal
1. Odorants reach receptors in the cilia of olfactory neurons. 2. cAMP opens ions channels that allow sodium and calcium ions to enter the cell. 3. The G-protein activates an enzyme, adenylate cyclase, to convert ATP into cyclic AMP (cAMP). 4. The binding of an odorant activates a G-protein which then detaches from the receptor. 5. The membrane is depolarized. Depolarization that reaches threshold at the axon hillock triggers an action potential and transduction has been achieved. A) 1, 3, 4, 2, 5 B) 1, 4, 3, 2, 5 C) 1, 2, 3, 4, 5 D) 1, 4, 2, 3, 5
The paired erectile bodies in the penis are the
A) membranous urethra. B) penile urethra. C) corpus spongiosum. D) corpora cavernosa. E) prepuce.