OBJECTIVE:
 identify cells as the basic unit
of life
 describe how cells form tissues,
organs and body systems
CELLS
◦100 trillion cells in the
human body
◦over 200 different types
of cells
◦skin, muscle, brain, blood,
bone, ………
WHAT DO CELLS NEED TO GROW?

Food for high energy and good growing power
Cells need energy to grow, move, talk, think and play
 Eat lots of
 fresh fruit and vegetables
 milk
 whole grains, cereal, pasta
 meat …protein
 not too much junk food
Food is digested … it is broken down into molecules tiny enough for the
blood to deliver it to the body’s cells
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Water

Oxygen for survival … it helps turn food into energy

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Where do cells get oxygen?
 we breathe in air, it goes into the lungs, then enters the bloodstream
 then the heart pumps moving the oxygen to the cells
The average person breathes about 2,500 gallons of air each day
Do all cells in your body live as long
as you do?
No
– some cells only live for a short period of time
but when they die new cells take there place …
example skin cells … live a few days
– Other cells, like brain cells, live as long as you
do … once they are destroyed they are not
replaced
– Our body’s grow when more cells are produced
than actually die
Cells
tiny compartments of life that make up all
living things
• the building blocks of life
• cells work together to help your body function
well
• cells come in different shape and sizes
• each cell does a special job … they make up
– your skin cells, muscles, bones, your brain, and are in your blood
Parts of cells
1) nucleolus
(2) nucleus
(3) ribosome
(4) vesicle
(5) rough endoplasmic
reticulum (ER)
(6) Golgi apparatus
(7) Cytoskeleton
(8) smooth endoplasmic
reticulum
(9) mitochondria
(10) vacuole
(11) cytoplasm
(12) lysosome
(13) centrioles within
centrosome
Parts of cells
• Most cells have the same 3 basic parts:
– cell membrane
– cell nucleus
– cytoplasm
OBJECTIVE:
 describe how cells form tissues,
organs and body systems
 explain how body systems are
interrelated
 identify ways to keep your body
systems healthy
Body Systems
– groups of similar cells that
do the same kind of work
 tissues
– a structure that is made up of
different types of tissues that do a
particular job
 organ
– formed by a group of
organs that perform a related task
 systems
Body Systems
a group of organs that work together to
support an important body function
??????? EXAMPLES ??????

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examples: Nervous System
Circulatory System
Skeletal System
Muscular System
Digestive System
Excretory System
Respiratory System
they work together to keep you alive and safe
the systems of the body are organized by what they
do, not where they are
example - mouth and small intestine - digestive system
interrelated – the systems
work together and are
dependent on one another
to keep the body
functioning properly
The Body Systems and Their Function

Supports the body, protects organs & helps you move

Moves body parts and controls organs

Skeletal System
Muscular System

Circulatory System

Transports materials, (food, oxygen, hormones), to
cells and removes waste from cells …. Carried in
blood

Digestive System

Breaks down food into substances that your cells can
use.

Excretory System

Removes waste and controls the body’s water levels

Respiratory System

Supplies blood with oxygen and removes carbon
dioxide

Nervous System

Sends and receives messages to control all body
systems

Ways To Keep
Your Body Systems
Healthy
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Eat a balanced diet
drink plenty of water
exercise … be active
stay away from drugs and alcohol
don’t smoke … stay away from second hand smoke
manage your stress
exercise safely … warm-up, stretch, cool down
get enough rest
Follow common sense safety rules

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
wear protective equipment when required
wear a helmet
wear seat belts