Transcript The Circulatory System

The Circulatory System
FUNCTION:
Delivery system that moves
oxygen and nutrients to the
body's cells, and carries away
carbon dioxide and waste
materials.
www.biosbcc.net/doohan/ sample/htm/heart.htm
Parts of the Circulatory System
• Divided into 3 major parts:
– Heart
– Blood
– Blood Vessels
http://users.tpg.com.au/users/amcgann/body/circulatory.html
Blood Vessels
Hollow tubes that circulate your blood
•Arteries
•Veins
•Capillaries
Arteries
•Carry blood away from the heart
•Have strong, muscular walls
•The inner layer is very smooth so that
the blood can flow easily
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
Veins
• Carry blood to the heart
• Transport waste-rich/ oxygen-poor blood
back to the lungs and heart
• Valves inside the veins make blood move
in one direction
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
Capillaries
• Only one cell thick
• Connect arteries & veins
• Food and oxygen released to the body
cells
• Carbon dioxide and other waste products
returned to the bloodstream
http://sln.fi.edu/biosci/system
s/circulation.html
http://users.tpg.com.au/users/amcgann/body/circulatory.html
The Heart
• Size of your fist
• Thick muscular walls
• 4 chambers –L/R Atrium, L/R Ventricle
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
Close up of heart valve
Heart sounds are made by the valves
as they open and close
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
Blood
• Carries nutrients, water, oxygen and waste
products to and from your body cells.
• White blood cells protect the body from
germs
http://hes.ucf.k12.pa.us/gclaypo/circdia.html