Oxygen and carbon dioxiode are transported between the blood and interstitial fluid by way of
A. exocytosis and endocytosis by endothelial cells.
B. pinocytosis using fluid-filled vesicles.
C. diffusion from areas of higher concentration to lower concentration.
D. active transport (using ATP) by protein carriers of endothelial cells.
C
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One substance has no membrane transporters to move it but can diffuse freely through open leak channels if there is a concentration gradient. Initially, this substance's concentrations in the filtrate and extracellular fluid are equal. Later, however, the active transport of Na+ and other solutes creates a gradient by removing water from the lumen of the tubule where it is located. What substance
is this? A) urea B) glucose and calcium C) glucose D) glucose, calcium, and urea E) calcium
Define epidural anesthetic
What will be an ideal response?
Hormones from the adrenal medulla increase
A) heart rate. B) all of the above. C) breathing rate. D) blood pressure.
A motor unit is a single muscle plus all of the motor neurons that innervate it
Indicate whether the statement is true or false