Human Body Systems

Helpful microorganisms that live in the digestive system and support digestion and health.

A digestive fluid produced by the liver that helps break large fat droplets into smaller ones.

A hollow ball of cells that forms before implantation.

A specialised connective tissue that transports substances throughout the body.

The force exerted by blood against the walls of arteries.

The main control centre of the nervous system.

The part of the brain that connects to the spinal cord and controls many involuntary functions.

The two main air passages that carry air from the trachea into the lungs.

Smaller branches of the bronchi that lead to the alveoli.

The layer of microvilli covering the epithelial cells of the small intestine.