Last night you vegged out in front of the TV set and watched a couple of hours of programs. However, this morning you have trouble remembering the plot of either program. Your passive viewing of the television is a good example of

The longest stage of labor is the

A) second, delivery of the baby. B) first, delivery of the placenta. C) third, delivery of the placenta. D) first, dilation and effacement of the cervix.

A scan shows that a particular substance has spread throughout the body via the bloodstream but has not entered the brain. This finding demonstrates the existence of

a. the blood-brain barrier. b. blood efficacy. c. medicine effects. d. the lipid bilayer. e. the doctrine of specific nerve energies.