Download Circulatory System

Circulatory System
Cardiovascular System
*or Circulatory system includes heart, blood vessels, and blood
Function = carries needed substances to cells and carries waste
products away from cells ( also blood contains substances
that fight disease)
= HOMEOSTASIS= Balance
Needed materials= oxygen from lungs, blood transports
glucose to cells
Waste products= carbon dioxide is carried as a waste
product from your blood to your lungs where it is exhaled
Disease fighters= carries cells that attack disease to
prevent you from becoming sick
How the heart Works
• 2 phases
• Relax = atria fill with
blood
• Atria contract and fill
ventricles
• Ventricles contract and
push blood forward
Types of Blood Vessels
• Arteries
• Veins
• Capillaries
Arteries
• Vessels through which
blood leaves the heart
• Coronary artery is the
first branch that
carries blood to the
heart
• 3 layers
Veins
• Blood enters after
traveling through the
capillaries.
• Like arteries they have
3 layers that make up
the walls. The big
difference is that veins
aren’t as thick.
• They are much
thinner.
Capillaries
• Blood from arteries
enters capillaries and
then flows into the
veins.
• Materials(oxygen,
waste materials) are
exchanged between
the blood and body
cells. This process is
called diffusion.
Blood pg. 413
4 components
1) Plasma-clear yellowish liquid, nutrients 90% water(top)
2) Red blood Cells- red, oxygen (bottom)
3) White blood cells- mixed, fight disease infection
4) Platelets- help in clotting
Blood types
A, B, AB, O
-Each blood type recognizes proteins in the blood, and will
react (clump if given a transfusion of another type)
-clot = got
-no clot = no got
Transfusion types
•
•
•
•
•
•
•
•
AA+
BB+
ABAB+
OO+
A-, OA+, A-, O+, OB-, OB+, B-, O+, OAB-, A-, B-, OAll Types (Univ. Rec.)
OO-, O+ (Univ. Donor)
Path of Blood Through the Heart
Vena Cava
Aorta
Pulmonary Artery
Pulmonary veins
R.Atrium valve
Pulmonary artery
L. Atrium
valve
valve
R. ventricle
L. Ventricle
Septum
Vena Cava
Muscle
Structure of the Heart
• Atrium= 2 upper
chambers where blood
comes into the heart
• Ventricles= lower
chambers that pump
blood out of heart
• Valve= flap of tissue
that keeps blood from
flowing back into
heart
Structure and Function of Heart
• Each time the heart
beats it’s pushing
blood through the
cardiovascular system
• 3 billion X’s a year
• Fill 30 competition
size swimming pools
• 1 beat 60mm blood
• 5 L blood p/m