Animals, such as squirrels, prepare for activities like fighting or running away through the release of the hormone adrenaline from the adrenal glands, facilitating widespread changes in various tissues to conserve energy and coordinate responses.

Auxin is synthesized at the shoot tip and, when light is detected, it diffuses towards the shady side of the shoot. Concentration of auxin on the shaded side stimulates cell growth, causing the plant to bend towards the light.

Hormones in multicellular organisms coordinate growth, development, and responses to the environment. In plants, hormones like auxin are synthesized away from the area of action and diffuse to that area, influencing cellular responses.

Releasing a chemical compound enables diffusion around the original cell, potentially reaching all cells in the body. This chemical communication can be slower but reaches cells beyond nervous connections, ensuring steady and persistent transmission of information.

Most multicellular organisms use chemical communication between cells due to the limitations of electrical impulses, ensuring broader communication beyond cells connected by nervous tissue and allowing for sustained signaling.