The smallest

unit capable

of life!

CELLS

• Multi-cellular: contain SPECIALIZED cells; some protists, animals, plants, fungi

Types of Living Things• Single-celled: simple; uni-

cellular; bacteria and some protists (amoeba & algae)• Prokaryotic cell =

BACTERIA ONLY; no nucleus; small, simple, self-sustaining

• Eukaryotic cell = all other life; nucleus and other organelles; complex

How Living Things Are Organized

living thing

NOTliving

SPECIALIZATION• Different types of cells form

during your development and perform different jobs in your body• Differ in shape, size, function,

and life span• a.k.a. Differentiation

1 nerve cells or neurons

carry "messages" through the

body

2 & 3red blood cells

white blood cells

carry oxygen from lungs to

other body cells

defend body from disease

4

muscle cellslengthen and

contract to allow for movement

5skin cells

shield the internal body from germs; control water

loss

6bone cellsform the

skeleton and support the

body

Major Systems of the Human

Body

CIRCULATORYSYSTEM

lymphaticsystem

cardiovascularsystem

Comparing Organ Systems•Trachea

•Teeth and saliva•Arteries•Muscles•Ligaments•Veins•Lungs•Cartilage

•Stomach•Capillaries•Heart•Intestines•Bronchi•Esophagus•Bones•Blood