Erection occurs when
A. the spongy erectile tissue of the penis becomes engorged with blood.
B. the veins flowing out of the penis vasoconstrict.
C. the arteries of the penis vasodilate.
D. nitric oxide is released.
E. All of these events occur to promote an erection.
E. All of these events occur to promote an erection.
You might also like to view...
The sounds produced by different species of frogs
A. are unique to each species. B. are used to attract mates. C. are instinctive. D. All of these answers are true.
Which of the following would not be important when evaluating measures of frequency?
A) how the population is defined B) how long the infection lasts C) factors that may be linked to cases of the disease D) prevalence rate E) incidence rate
Groups of related, but distinctly different genes that appear to have arisen from a single ancestral gene are referred to as
A. segmental duplications. B. pseudogenes. C. tandem clusters. D. multigene families. E. expressed sequences.
An adult who is suffering from hyperthyroidism
a. is always tired. b. shows lack of emotions. c. is often hungry. d. sleeps a significant amount of the time. e. is never hungry.