The reabsorption and secretion of _______ is regulated by parathyroid hormone
a. Ca2+
b. PO43-
c. K+
d. Ca2+and PO43-
e. PO43- and K+
E
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The hepatic ________ system is a venous network that drains the GI tract and delivers blood to the liver.
Fill in the blank(s) with the appropriate word(s).
Atrial natriuretic peptide (ANP) is a hormone that is made in the atria of the heart. The influence of this hormone is to ________
A) prevent pH changes caused by organic acids B) reduce blood pressure and blood volume by inhibiting sodium and water retention C) enhance atrial contractions D) activate the renin-angiotensin mechanism
In general, respiratory zone structures are lined with a thicker mucosa than conducting zone structures.
Answer the following statement true (T) or false (F)
Night blindness could be caused by
A. a lack of iodopsin. B. a lack of vitamin C in the diet. C. too much vitamin A in the diet. D. a lack of rhodopsin. E. a lack of cones.