Which term below is atrial contraction

A hemoglobin molecule is composed of

The ____ are air-filled respiratory system structures common in insects.​

In response to a significant drop in blood pressure, ____ is produced, which quickly raises blood pressure by constricting many arterioles.​

Nitrogenous waste is excreted from Malpighian tubules mainly in the form of ____.​

Functions of the kidneys include all but one of the following. Identify the exception.

You are an EMT that is working at a parade on a hot day. There is a college marching band getting ready for their performance. The director gets everyone lined up and begins a one hour warm up where everyone is required to stand in place during the warm up. Toward the end of the warm up, you receive a call that a few members of the band have fainted from standing at attention for the long practice. The members all play different instruments and seem to have normal temperatures, normal blood pressures and only complain of being light headed before the fainting but otherwise feel fine now. What is the simplest and most likely explanation for the fainting?

Kidneys respond relatively ________ to changes in blood volume.

Regarding the cardiovascular system, the main role(s) of the kidneys is/are to

As elevation increases, O2 ____.​