OBJECTIVE: identify cells as the basic unit of lifedescribe 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

Water

Oxygen for survival … it helps turn food into energy 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

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

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 systemsexplain how body systems are interrelatedidentify ways to keep your body systems healthy

Body Body SystemsSystems

tissues – groups of similar cells that do the same kind of work

organ – a structure that is made up of different types of tissues that do a particular job

systems – formed by a group of organs that perform a related task

Body SystemsBody Systemsa group of organs that work together to a group of organs that work together to support an important body functionsupport an important body function

??????? ??????? EXAMPLES EXAMPLES ???????????? examples: Nervous System Circulatory System examples: Nervous System Circulatory System

Skeletal System Muscular Skeletal System Muscular System System Digestive System Digestive System Excretory System Excretory System Respiratory Respiratory System System

they work together to keep you alive and safe they work together to keep you alive and safe

the systems of the body are organized by what they the systems of the body are organized by what they do, not where they aredo, not where they are

example - mouth and small intestine - digestive systemexample - 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

Skeletal System Muscular System

Circulatory System

Digestive System

Excretory System

Respiratory System

Nervous System

Supports the body, protects organs & helps you move

Moves body parts and controls organs

Transports materials, (food, oxygen, hormones), to cells and removes waste from cells …. Carried in blood

Breaks down food into substances that your cells can use.

Removes waste and controls the body’s water levels

Supplies blood with oxygen and removes carbon dioxide

Sends and receives messages to control all body systems

Ways To Keep Your Body Systems Healthy

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

wear protective equipment when required wear a helmet wear seat belts