Some people have low levels of calcium circulating in the blood, a condition known as hypocalcemia. while for many this disorder has little to no effect, for some it can be life-threatening. how could low levels of calcium harm an individual?
low levels of calcium would not have any effect on synaptic transmission.
low levels of calcium would cause sustained depolarization of the presynaptic cell.
low levels of calcium would result in fewer signals sent between the pre- and postsynaptic cell.

Many birth-control pills release a constant amount of synthetic estradiols and progesterone for 21 days, followed by 7 days when no hormones are ingested. which of the following statements most accurately describes the effects of birth-control pills? -birth-control pills maintain constant levels of estrogens and/or progesterone so there is no surge in lh and ovulation does not occur.-birth-control pills inhibit the development of the uterine lining so implantation of a fertilized oocyte cannot occur.-birth-control pills maintain constant levels of estrogens and/or progesterones and mask the release of the oocyte from the follicle.-the 7 days with no hormones does not allow a thick enough uterine lining to form so a fertilized oocyte cannot implant.