1) list the following in order of increasing mass: atom, molecule, proton, neutron,
electron.
2) red blood cells in the circulation live for about ________. the short life span is due to
________.
3) compare and contrast the effects of cholinergic and adrenergic fibers on the heart.
include a comparison of the various types of receptors they interact with, and their
location on the heart.
4) compare and contrast the roles of cytotoxic t cells and nk cells.
5) metabolism is often divided into ________, energy-producing reactions, and
________, energy-utilizing reactions.
6) the carrier protein that transports absorbed iron through the blood is ________.
7) a gap junction forms when opposing membrane-spanning proteins called ________
on two adjacent cells unite, creating a protein channel that is capable of opening and
closing.