Metabolism Key Concepts

A functioning human body has molecules from food (glucose and amino acids) and molecules from ___________ in its cells.

Cells can only use molecules that are ____________ enough to enter a cell.

The respiratory system brings in oxygen molecules from the air. These oxygen molecules are already __________ enough to fit into cells.

The digestive system brings in food and breaks it down into smaller molecules, such as ______________, that can fit into cells.

The circulatory system transports __________, oxygen, and amino acid molecules to every cell in the body.

Systems can work together to form a ________ more complex system.

In a functioning human body, body systems __________ to deliver glucose, oxygen, and amino acid molecules to the cells in the body.

A problem with a body system can result in _______oxygen, glucose, and/or amino acid molecules getting to the body's cells.

The circulatory system transports glucose, oyxgen, and amino acid molecules to __________ cell in the body.

In order to release energy, cells need both ________and oxygen molecules.