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; some protists (amoeba)

How Living Things Are Organized

SPECIALIZATION• Different types of cells form

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

and life span• Adult humans have over 200

types of cells• 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 cells

lengthen and contract to allow for

movement

5skin cells

shield the internal body from germs; control water

loss

6bone cells

form the skeleton and support the

body

Major Systems of the Human

Body

Comparing Organ Systems•Trachea

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

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

nerve cells or neurons

white blood cells

carry oxygen from lungs to other body

cells

defend body from disease

muscle cells

lengthen and contract to allow for

movement

shield the internal body from germs; control water

loss

red blood cells

carry "messages" through the

bodyskin cells

bone cells

form the skeleton and support the

body