Quiz 9 Flashcards
When the diaphragm and external intercostal muscles contract,
the volume of the chest cavity (thorax) increases.
Surfactant
helps prevent the alveoli from collapsing.
The most important chemical regulator of respiration is
carbon dioxide.
Gas exchange between the lungs and the atmosphere occurs in the __________.
alveoli
The CFTR channel is an anion channel that is dysfunctional in patients with cystic fibrosis. It is required for the proper production of mucus in the respiratory tract. Which anion moves through the CFTR channel?
Chloride
As one moves up in altitude, the atmospheric pressure decreases. In Vail, Colorado (altitude 8022 ft or 2445 m), the atmospheric pressure is approximately 570 mmHg. What would the partial pressure of oxygen be in Vail?
570 x .21 = 120 mm Hg
What is the composition of the filtrate in the capsular space?
Similar to plasma, only no proteins
In a normal kidney, which of the following conditions would cause an increase in the glomerular filtration rate (GFR)?
a decrease in the concentration of plasma proteins in the blood
The primary function of the proximal convoluted tubule is
reabsorption of ions, organic molecules, and water.
Why does osmotic concentration decrease in the thick ascending limb of the loop of Henle?
Na+ and CI- are actively transported out of the tubular fluid.
______________________ cells send a chemical message to the neighboring afferent arteriole. The afferent arteriole constricts, increasing resistance and decreasing GFR.
MACULA DENSA
