Which specific cells of the pancreatic islets (islets of Langerhans) release insulin in response to high blood glucose levels?
A) alpha cells
B) beta cells
C) delta cells
D) gamma cells
E) theta cells
B
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Which of the following statements is not true of the precapillary sphincters?
A) They decrease the osmotic pressure in the thoroughfare channel. B) They increase or decrease rates of perfusion to the tissues served by the true capillaries. C) They allow blood to bypass the true capillaries that are fed by the metarteriole. D) They regulate the flow of blood to tissues served by the true capillaries.
During most of ventricular diastole, the atrium is still also in diastole
a. True b. False Indicate whether the statement is true or false
The ________ system regulates blood volume and pressure, stimulates red blood cell formation, and controls fluid, electrolyte, and acid-base balance
A) digestive B) urinary C) circulatory D) respiratory E) muscular
To achieve fluid balance, ion concentration gradients are eliminated by
A) osmosis. B) diffusion. C) active transport. D) pinocytosis. E) facilitated diffusion.