The AV node
a. is the normal pacemaker of the heart
b. is the only electrical connection between the atria and the ventricles
c. rapidly conducts impulses from the atria to the ventricles so that they contract simultaneously
d. is not innervated by the vagus nerve
e. has the slowest rate of depolarization in the heart
B
You might also like to view...
________ are raised sensory structures within the ampulla of semicircular canals that contain the hair cells.
Fill in the blank(s) with the appropriate word(s).
The oral contraceptive pill, informally called "the pill" contains an estrogen and progesterone or a synthetic mimic of this hormone. The combination of these two hormones taken in the pill and circulating in the blood work because
A) The hormones cause the woman's body to mimic the activities of a pregnancy and disrupt the ovarian cycle, preventing ovulation. B) The hormones create an acid condition in the vagina that acts as a spermicide. C) The hormones prevent the proliferative or secretory phase of the menstrual cycle and the embryo will have no place to implant. D) The hormones cause a thickening of the mucus plug at the cervix that prevents sperm from penetrating the womb and reaching the ovulated egg.
Bile produced by the liver cannot be directly emptied into the small intestine or stored in the gall bladder
Indicate whether the statement is true or false
During exercise, blood flow to the _____ remains fairly constant
a. kidney b. heart c. skin d. brain e. liver