Most of the carbon dioxide transported by the blood (approximately 70%) is
A) dissolved in plasma.
B) bound to hemoglobin.
C) transported as bicarbonate ions in the plasma.
D) bound to the same protein as carbon dioxide.
E) carried by white blood cells.
C) transported as bicarbonate ions in the plasma.
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The sensation of itch is communicated to the brain on dedicated itch receptors.
Answer the following statement true (T) or false (F)
Typically, there are __________ papillary muscles that project from the wall of the left ventricle and attach to the tendinous cords that support the left AV valve
A. three B. two C. a highly variable number of D. six E. no
The most important buffer system in the extracellular fluid is
A) carboxyl groups. B) chloride. C) monoprotonated phosphates. D) amino acids. E) bicarbonate.
What two factors limit the rate of facilitated diffusion across a plasma membrane?
A) the size of the substance and the charge of the substance B) the size of the substance relative to the size of the carrier protein C) the charge of the substance relative to the resting membrane potential of the cell D) the concentration gradient of the substance and the number of carrier proteins E) the temperature of the interstitial fluid and the pH of the interstitial fluid