Principles of organisation

Cells → tissues → organs → organ system → organism

Cells – basic structural & functional units of living organisms

Muscular	Contracts to move things attached to it In stomach, contracts to move food
Glandular	Contains secretory cells Produce & release substances (enzymes, hormones)
Epithelial	Covers outside of body & internal organs

Tissues – a group of cells with similar structure & function working tgt

In stomach

Muscular	Contract to churn food
Glandular	roduce digestive juice to digest food with enzyme & HCl
Epithelial	Covers outside & inside of stomach

Organs – a group of different tissues working together to perform specific function

Organ system – a group of organs working together to perform specific functions

Organisms – a group of organ system working together