Introduction to Metabolism. SBI4U Biology. What does Metabolism mean?. The overall process by which an organism obtains nutrients, deals with them, and extracts energy from them. How the organism uses that energy.
forming cells, tissues…
going from simpler molecules to more complex ones.
synthesis of polymers
digesting nutrients, ingesting food…
going from more complex molecules to simpler ones
hydrolysis of polymersMetabolism has two phases:
You eat an egg so that you can obtain amino acids for your own body’s use.Catabolism!
Using the amino acids from that egg you ate to build muscle.Anabolism!
Energy in > Energy out = weight gain
Energy out > Energy in = weight loss
Eating disorders can complicate matters.
We think this is a recent, or modern-day problem, but look at this Kellogg’s advertisement from the early 1900’s