As a general rule, water follows salt. (U9)

A high concentration of solutes (salt) in the renal medulla is necessary to produce concentrated urine. (U11)

______ is an enzyme secreted by the juxtaglomerular cells when blood pressure drops.

The ______ blood vessels run along the boundary of the cortex and medulla. (U6)

______ averages 500 ml. fill in the blank with a lung capacity. (R9)

Hypotonic fluid loss also produces cell dehydration (cells shrink). (B4)

The additional air a person can take in after normal inhalation is the _____. fill in the blank with a lung capacity. (R9)

In a normal individual, ventilation rates are primarily regulated by …. (R16)

Identify the number of lobes in the left lung: (R3)

Gas exchange between the atmosphere and tissues is necessary because of cellular respiration. (R1)