Key definitions
Figure 2.14 These cells make up a tissue lining the bronchus (a tube that carries air into the lungs). The tiny ‘hairs’ are called cilia.
tissue – a group of cells with similar structures, working together to perform a shared function organ – a structure made up of a group of tissues, working together to perform specific functions organ system – a group of organs with related functions, working together to perform body functions
Summary
S
You should know: ♦ the structure of an animal cell and a plant cell as seen using a microscope, and be able to compare them ♦ the functions of the different parts of animal cells and plant cells ♦ how cells are organised into tissues, organs and organ systems ♦ how to calculate magnification using µm (micrometres).
End-of-chapter questions 1
Arrange these structures in order of size, beginning with the smallest: stomach
2
starch grain
tracheal cell
nucleus
For each of the following, state whether it is an organelle, a cell, a tissue, an organ, an organ system, or an organism. a b c d e f g
26
mitochondrion
heart trachea onion epidermis onion bulb onion plant human being lung
Cambridge IGCSE Biology
Original material © Cambridge University Press 2014