The question is what does it regulate. . 1 sentence for each will

a regulate is to control or direct by a rule, principle, or method.

The pituitary gland secretes hormones, which can stimulate growth.

The thyroid gland produces hormones which regulate the body's metabolic rate as well as heat and digestive function

The parathyroid glands are 4 tiny glands that control the bodies calcium level.

The adrenal gland produces hormones that are vital to life, such as cortisol, and aldosterone.

The pancreas regulates enzymes and produces insulin.

The ovaries produce and release eggs into the female reproductive tract and the mid point of each menstrual cycle.

The testes produce testosterone.

You can look these up on google also.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.