The hormone that lowers the calcium and phosphate ion concentration of the blood by inhibiting the release of calcium phosphate ions from the bones and increasing the excretion of these ions by the kidneys is
A. vasopressin
B. serotonin
C. melatonin
D. calcitonin
Answer: D. calcitonin
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Inhaling through the nostrils is preferred over the mouth because
A) there is less resistance to air flow. B) it combines olfaction with respiration. C) it allows better conditioning of the inhaled air. D) bacteria won't be inhaled from the oral cavity. E) it dries out the mouth.
Regulation of the amounts of water, sodium ions, and potassium ions lost in the urine occurs between the nephron loop and the
A) collecting system. B) distal convoluted tubule. C) renal corpuscle. D) proximal convoluted tubule. E) Bowman's capsule.
At the end of inspiration and at the end of expiration, intra-alveolar pressure is always equal to atmospheric pressure
Indicate whether the statement is true or false
What structures are used for direct cell to cell signaling?
A. Gap junctions B. Tight junctions C. Desmosomes D. Exocytosis vesicles