Final answer:
The interaction between angiotensin and ACE results in the production of angiotensin II, which causes vasoconstriction, increased blood pressure, and release of aldosterone and ADH, leading to D) All of the above.
Step-by-step explanation:
When angiotensin and ACE (angiotensin-converting enzyme) react, the result is the conversion of angiotensin I to angiotensin II. This reaction is a critical step in the renin-angiotensin-aldosterone system, which plays a significant role in regulating blood pressure and fluid balance. Angiotensin II is a potent vasoconstrictor, leading to increased blood pressure. It also stimulates the release of aldosterone from the adrenal cortex, and anti-diuretic hormone (ADH) from the hypothalamus, leading to sodium reabsorption and water retention in the kidneys, which further increases blood pressure. Therefore, the correct answer to what happens when angiotensin and ACE react is D) All of the above, as it includes the conversion of angiotensin I to angiotensin II (A), release of aldosterone (B), and increased blood pressure and vasoconstriction (C).