Which embryonic structures give rise to the common carotid arteries?
A. The dorsal aorta
B. Aortic arch III
C. The aortic sac
D. Pharyngeal pouches
E. Vitelline artery
B. Aortic arch III
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Preganglionic axons of the ANS release
A. acetylcholine. B. norepinephrine. C. either acetylcholine or norepinephrine.
Which of the following is incorrect pertaining to the ovarian artery?
A) It traverses the suspensory ligament of the ovary. B) It crosses anterior to the ureter. C) It has reduced blood flow following ligature of the internal iliac artery. D) It helps supply the uterine tube. E) It is accompanied by lymph vessels draining the ovary.
The long refractory period of cardiac muscle prevents tetanic contractions of the heart
Indicate whether the statement is true or false
Which of the following makes it possible for even a small quantity of hormone to have a strong effect on its target cell?
A) The antagonistic effect B) Enzyme amplification C) Up-regulation D) Down-regulation E) Negative feedback inhibition