The renal buffering system helps maintain acid-base balance through:
a. Excretion of ammonium ions
b. Excretion of bicarbonate
c. Recovery of hydrogen ions
d. Recovery of sodium
Answer: a. Excretion of ammonium ions
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A) Pseudo B) Referred C) Disguised D) Phantom
An increase in extracellular Ca2+ generally increases
A. autonomic stimulation of the heart. B. the heart rate. C. Na+ channel opening. D. the force of contraction. E. the frequency of the action potentials.
The endocrine system comprises a network of ___________ that produce and secrete chemical messengers called ____________.
A) glands, hormones B) nodes, catecholamines C) vessels, leukotrienes D) synapses, neurotransmitters
Which of the following is NOT a structure within the visual axis?
-conjunctiva -lens -fovea -cornea