When the stimulus intensity increases, ______
A) the number of action potentials increases
B) the size of the action potential increases
C) the size of the action potential decreases
D) the number of action potentials decreases
Ans: A) the number of action potentials increases
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Which of the following statements concerning the embryonic cardiovascular system is true?
A. The heart develops from four endothelial tubes. B. The bulbus cordis becomes the sinoatrial node (the adult pacemaker). C. Blood vessels form from blood islands. D. An opening in the interatrial septum is called the sinus venosus. E. There is an opening in the interventricular septum.
Which cells secrete testosterone?
a) Sertoli cells b) Spermatogenic cells c) Leydig cells d) Oogonia e) Chief cells
A ______________ clipper is a type of guillotine nail clipper
Fill in the blank(s) with correct word
What vessel(s) deliver oxygenated blood to the left atrium?
A) aorta B) pulmonary trunk C) pulmonary arteries D) pulmonary veins