Transcript chapter 1

CELLS
• BUILDING BLOCKS OF ALL THINGS
• EACH HAS A SPECIAL JOB
• THE SMALLEST LEVEL OF
ORGANIZATION
ABSORBING CELLS
• ABSORB THINGS
ASSEMBLY CELLS
• PUT TOGETHER
IMPORTANT
SUBSTANCES
– HORMONES –
CHEMICAL
MESSENGERS THAT
REGULATE CERTAIN
ACTIVITIES OF THE
BODY
– ENZYMES –
CHEMICALS THAT
BREAK DOWN FOOD
CELLS FOR MOVEMENT
MUSCLE CELLS
TISSUES
GROUP OF SIMILAR CELLS
DOING THE SAME THING
2ND LEVEL OF ORGANIZATION
MUSCLE TISSUE
• BY CONTRACTING
AND PULLING ON
BONES – MAKES
BODY MOVE
• LINE WALLS OF
STRUCTURES INSIDE
BODY
• FOUND IN THE HEART
– ENABLES IT TO
PUMP
CONNECTIVE TISSUE
• PROVIDES
SUPPORT FOR THE
BODY
– BONE
– BLOOD
– FAT
NERVE TISSUE
CARRIES MESSAGES
BACK AND FORTH
BETWEEN BRAIN
AND SPINAL CORD
AND THE REST OF
THE BODY
EPITHELIAL TISSUE
• FORMS A PROTECTIVE
SURFACE ON THE
OUTSIDE OF THE
BODY
– SKIN
– CAVITIES OF THE
MOUTH
– THROAT
– EARS
– STOMACH
ORGANS
DIFFERENT TYPES OF TISSUE
COMBINE TO FORM ORGANS
EX: HEART – MUSCLE,
EPITHELIAL, NERVE AND
CONNECTIVE TISSUES
3RD LEVEL OF ORGANIZATION
ORGAN SYSTEM
• A GROUP OF ORGANS THAT WORK
TOGETHER
• 4th LEVEL OF ORGANIZATION
• NO SYSTEM WORKS ALONE
– CIRCULATORY SYSTEM BRINGS FOOD
AND OXYGEN TO THE BODY AND
REMOVES WASTE