Packet 2: Tossup 18

Expulsion of this ion is coupled to intake of another by antiporters in the PCT that are triggered by angiotensin II. (-5[1])Enterochromaffin-like cells (-5[1])produce histamine (-5[1])that triggers the release of this cation (15[2]-5[1])by binding to H2 (-5[1])receptors. An ATPase (-5[2])that couples (-5[1])expulsion (-5[1])of this ion to (-5[1])K+ (-5[2])intake (-5[3])is (-5[1])blocked (-5[2])by (-5[4])omeprazole. (-5[2])This ion's (15[1]-5[1])secretion alongside intrinsic factor by (*) parietal cells is blocked by PPIs. (-5[1])High (10[1])concentration of this ion turns (-5[1])pepsinogen into (10[1])its active form, pepsin. Because chyme is rich in this ion, bicarbonate (-5[1])is released to neutralize it upon entry into the small intestine. For 10 points, (-5[1])stomach acid is rich (0[1])in what (-5[1])cation? (10[1]0[1])■END■ (10[12]0[15])

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