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II. Coordination of multicellular animal A. Internal environment (interstitial fluid supplies)

40.10

The life of an organism depends on the life of all of the cells that make it up. Each cell your body has the same basic needs:

food O2/CO2exchange waste disposal

water/salt balance temperature pH

This is easy for single, celled organism in the sea (isotonic), but multicellular organisms often live in environments that their individual cells could not survive in. This requires coordination; the cells need to be connected. Also,all of your cells need to be wetto prevent them from drying out, and to allow for the exchange of CO2 for O2 and food for waste. Most cells in your body are not in contact with the environment; instead they are bathed ininterstitial fluid.

B. Bioenergetics Bioenergeticsis how animals exchange energy with their environment. Animals obtainchemical energy by taking in and breaking down organic molecules synthesized by others.

40.7

Cellular work

Chemical energy

Food

Biosynthesis

Building blocks

Energy is lostas heat at all points.