The primary buffer in the blood is the ________ buffer.
A. hydronium
B. phosphate
C. ammonia
D. bicarbonate
Answer: D
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A blastocyst is a(n)
A) extraembryonic membrane. B) solid ball of cells. C) hollow ball of cells. D) portion of the placenta. E) origin of the urinary bladder.
Many polypeptide and glycoprotein hormones are secreted in discrete bursts called pulsatile secretions.
Answer the following statement true (T) or false (F)
Which of the following is true of potassium ions?
a. they are actively secreted in the proximal tubule b. their concentration is controlled by aldosterone c. changes in concentration can affect membrane excitability d. are reabsorbed in the distal tubule e. both (b) and (c)
The basal surface of epithelial tissue cells attach to the?
A) cilia B) basement membrane C) nucleus D) cytoplasm