Cells continually exchange materials and information with their environment. This exchange is crucial

This exchange is crucial on order to attain homeostasis

Explanation:

Substances may be transported down or against an electrochemical gradient.

Downhill transport occurs by diffusion, (simple or facilitated), and requires no input of metabolic energy.

Uphill transport occurs by active transport, (primary or secondary).

Primary active transport requires a direct input of metabolic energy while Secondary active transport utilizes an indirect input of metabolic energy.

The differences in solute concentration across cell membranes are created and maintained by energy-consuming transport mechanisms in the cell membranes.

The endocrine system pairs with the nervous system to achieve homeostasis within the body. Hormones are secreted to effect their actions on target tissues.

Explanation: