CHAPTER 2CELL AS A UNIT OF LIFE

What is CELL? – BASIC UNITS OF LIVING THINGS

Cells

All Living Organisms are made out of cells

Animals

Plants

Humans

Smallest unit Function and survive

on its own

Growth, respiration, division and excretion

Will die out eventually. All new cells are formed by cell division of other cells (mitosis).

Different sizes and shapes

Long, short, oval, has tail

USING A MICROSCOPE

WHO ARE THEY?

• Theodor Schwann

• In 1893, he asserted that plants and animals are made up of cells

ANIMAL CELL AND PLANT CELL

UNICELLULAR ORGANISM

MULTICELLULAR ORGANISMS

Sporangium contains spores. It is light at first and it be dark and darker as it matures. The spores inside will explode to the surface and it will continue growing.

THE TYPES AND FUNCTION OF HUMAN CELLS

TYPES OF TISSUE

ORGANS

SYSTEMS

LEVELS OF CELL ORGANISATION

DO YOU KNOW?

• Biggest cell in our body is MEGAKARYOCYTE ( a kind of blood cell) , which have a diameter of 0.2mm. They are found in bone narrow to prevent bleeding.

DO YOU KNOW?

• The smallest and longest living cell in our body is the brain cell