Biology revision- tissues, organs and organ systems

Tissues-
Large multicellular organisms, like humans, develop systems for exchanging materials. As the organismsm develops, cells differentiate so that they can carry out different jobs
A tissue is a group of cells that have a similar structure and function. For example...
Muscle tissue- interacts so we can move.
Glandular tissue- produce substances such as enzymes and hormones.
Epithelial tissue- covers organs.

Organs-
Organs are made of tissue, one organ may contain several tissues.
For example, the stomach is an organ…