Which valve closes when the left ventricle contracts?
a. mitral
b. right AV
c. tricuspid
d. pulmonary semilunar
e. aortic semilunar
ANSWER: a
You might also like to view...
The unique characteristics of an individual's iris pattern may be compared to the unique characteristics
of a person's a. facial features. b. height and weight combination. c. fingerprints. d. hair color. e. hair pattern.
A person eats an apple and is sick within two hours. This person suspects that there was some kind of contaminant on the skin of the apple. This person has
A. performed an experiment. B. made a correlation. C. established a theory. D. tested a hypothesis.
__________ is a process where a concentration of nerves and sensory structures forms in the head region.
Fill in the blank(s) with the appropriate word(s).
Which of the following is the dominant stage of the Bryophyte moss lifecycle?
a) sporophyte b) gametophyte c) lycophyte d) pterophyte e) stomatophyte