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