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Transcript 
Circulatory
System
Functions
•
•
•
•
•
Transport oxygen and carbon dioxide
Distribute nutrients
Transport wastes
Distribute hormones
Regulate body temperature
The Heart
Cardiac cycle
Systole – ventricle
contraction
Diastole – relaxation of
all chambers following
contraction of atria
Blood’s Path Through the Heart Deoxygenated
1.
2.
3.
4.
5.
Vena cava
Right atrium
Right ventricle
Pulmonary Arteries
Lungs
Blood’s Path Through the Heart Oxygenated
6.
7.
8.
9.
10.
11.
Lungs
Pulmonary Veins
Left atrium
Left ventricle
Aorta
Body
Influence on Heart Rate
• Nervous system
• Hormones
Functions of Blood
• Transport
–
–
–
–
Nutrients
Gasses
Hormones
Waste Products
• Immune Response
Blood Composition
•
•
•
•
Plasma 55-60%
Red blood cells – carry oxygen
White blood cells - immunity
Platelets – clotting
***Blood is mostly saltwater!***
Blood Vessels
• Arteries/arterioles – have smooth muscle
in walls, take blood away from the heart
• Capillaries – very small, place where most
gas exchange occurs
• Veins/venules – have valves, no muscle,
take blood toward the heart
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