The vertebrate kidney helps to keep the acidity of the body fluids constant by varying the amount of hydrogen ions it secretes into the urine. You can confidently predict that this aspect of kidney function would be controlled by

Hypothalamus

You can confidently predict that this aspect of kidney function would be controlled by hypothalamus

Explanation:

Hypothalamus is the part of the brain found just below the thalamus. It plays an important role in homeostasis i.e maintaining balance of water and electrolyte in the body.

The amount of electrolyte such as hydrogen ions in the body is controlled by the hypothalamus, when it stimulate the kidney to excrete excess hydrogen ions through urine, or retain hydrogen ions from urine.

Thus, hypothalamus is the answer

the match duh

explanation:

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.