Label C represents the
A) pulmonary trunk.
B) ascending aorta.
C) right pulmonary arteries.
D) right pulmonary veins.
E) superior vena cava.
C) right pulmonary arteries.
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A complete atom is electrically neutral because
A) electrons is greater than the number of protons. B) the number of electrons equals the number of neutrons. C) the number of protons equals the number of neutrons. D) the number of electrons equals the number of protons.
As food moves into the esophagus from the mouth:
a. peristaltic contractions move food toward the stomach b. gravity assists peristaltic contractions to move food toward the stomach c. smooth muscle contractions end d. digestive enzymes are secreted by the lining of the esophagus e. the gastroesophageal sphincter remains closed
What is the name of the vesicle at the tip of a sperm cell that contains enzymes that will help the sperm cell penetrate an egg cell it encounters?
A) scrotum B) amnion C) chorion D) Sertoli cell E) acrosome