Transcript The Circulatory system

THE
CIRCULATORY
SYSTEM
The Transportation System
THE CIRCULATORY SYSTEM
http://www.youtube.com/watch?v=q0s1MC1hcE&feature=related
 Composed of heart, blood vessels and
blood
 Function: transport materials throughout
the body to cells and take waste products
away from cells

THE HEART - THE PUMP

4 Chambers
 left
and right atria receive blood to the heart
 left and right ventricles pump blood away from the
heart
 Valves open to allow blood to pass through and
close to prevent backflow
 Sinoatrial node – area above the right atrium that
generates a normal sinus rhythm (causes the heart
to beat)
THE HEART – THE PUMP

http://www.youtube.com/watch?v=PgI80UeAMo&feature=player_embedded#
http://www.medicalook.com/Heart_diseases/
THE BLOOD VESSELS – THE HIGHWAYS

Artery – carries blood away from the heart

Vein – carries blood toward the heart

Capillaries – connect arteries and veins; they
are so thin that nutrients and oxygen diffuse
right through them
THE BLOOD – THE TRUCKS & POLICE


http://www.youtube.com/watch?v=CRh_dAzXuoU
Composed of
 plasma
– yellowish liquid part of blood that carries
nutrients, clotting factors, sugar, hormones, etc.
 red blood cells – erythrocytes - made in the bone
marrow - carry oxygen and carbon dioxide –
hemoglobin gives them the red color
 white blood - leukocytes – made in bone marrow,
lymph tissue, thymus, spleen – defend the body against
invaders
 platelets - thrombocytes – aid in clotting of blood –
formed in bone marrow