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When the hypothalamus in the brain detects that the blood is getting too concentrated (not enough water), it stimulates the pituitary gland to release an anti-diuretic hormone (ADH). When it reaches the kidn...

In a series circuit, the current is the same throughout; the voltage is split among the components (such as LEDs or resistors) in proportion to the resistance of the components (higher resistance means more ...

It provides an alternative reaction pathway with a lower activation energy. However, it does not lower the activation energy for the 'normal' reaction without a catalyst.

(x+3)(x-7) = (x x) + (x -7) + (x 3) + (3 -7) = x^2 - 7x + 3x - 21 = x^2 - 4x - 21 Key here is to ensure you multiply each term in one bracket by both in the other, and to keep careful track of the signs.

To form the imperfect active subjunctive, you take the perfect active infinitive of a verb and you add endings that are (almost) identical to the usual present active indicative verbs. For example, the 3rd p...