Round 2: Tossup 18
Expulsion of this ion is coupled to intake of another by antiporters in the PCT that are triggered by angiotensin II. Enterochromaffin-like cells produce histamine that triggers the release of this cation by binding to H2 receptors. An ATPase that couples expulsion of this ion to K+ intake is blocked by omeprazole. This ion's secretion alongside intrinsic factor by (*) parietal cells is blocked by PPIs. High concentration of this ion turns pepsinogen into its active form, pepsin. Because chyme is rich in this ion, bicarbonate is released to neutralize it upon entry into the small intestine. For 10 points, stomach acid is rich in what cation? ■END■
ANSWER: H+ ions [or protons; accept proton pumps or proton pump inhibitors or Na-H antiporter or H-K ATPase]
<Science - Biology, Rohan Kher> | VAULT II Packet 02
= Average correct buzzpoint
Buzzes
| Player | Team | Opponent | Buzzpoint | Value |
|---|---|---|---|---|
| Peter Mahowald | Belmont A | Lexington B | 31 | -5 |
| Saisabari Ramesh | Waltham B | Waltham A | 38 | -5 |
| Shreyas Kandela | Mansfield A | Mansfield B | 46 | -5 |
| Aadi Pudasaini | Lexington A | Belmont B | 48 | -5 |
| Simon Zhang | Lexington B | Belmont A | 106 | 10 |
| Ulises Shah | Belmont B | Lexington A | 106 | 0 |
Summary
| Tournament | Edition | Match | Heard | Conv. % | Power % | Neg % | Avg. Buzz |
|---|---|---|---|---|---|---|---|
| VAULT II at Georgia Tech | 2026-01-24 | ✓ | 6 | 67% | 17% | 83% | 78.75 |
| Triangle Cup | 2026-03-13 | ✓ | 3 | 33% | 0% | 67% | 106.00 |
| VAULT II at Eden Prairie HS | 2026-03-13 | ✓ | 3 | 33% | 0% | 33% | 106.00 |
| VAULT II at McGill | 2026-03-13 | ✓ | 4 | 75% | 0% | 100% | 106.00 |
| VAULT II at UCSB | 2026-03-13 | ✓ | 5 | 40% | 0% | 100% | 105.50 |
| VAULT II Northern UK | 2026-04-24 | ✓ | 3 | 67% | 0% | 33% | 106.00 |
| VAULT II Southern UK | 2026-04-24 | ✓ | 4 | 75% | 50% | 75% | 63.33 |
| VAULT II at Harvard | 2026-04-30 | ✓ | 4 | 25% | 0% | 100% | 106.00 |
| VAULT II at MINT | 2026-06-19 | ✓ | 5 | 20% | 0% | 100% | 65.00 |