Which of these is NOT an exchange system?

Which of these is NOT one of the four major elements found in the human body?

Which of these will alter the activity of an enzyme?

BONUS: Horizontal shoots that grow along the surface and give rise to new plant shoots are called [BLANK-1].

The maintenance of normal muscle tone and the coordination of multiple muscles is the job of the ___________.

Osteoporosis is a condition that results in reduced bone density due to low blood calcium levels. The reduced bone density is due to excess release of ____________.

Which of these does NOT have to be maintained at a constant level in the human body?

Which of these is true of water soluble hormones?

Baroreceptors in the kidneys sense a decrease in pressure in the nephrons of the kidney. This sends a signal to the hypothalamus which triggers the posterior pituitary to release antidiuretic hormone. In this case the posterior pituitary is the __________.

The ______ is responsible for stimulating a long term sympathetic response in the body.