Circulatory System

1
Circulatory System
2
Functions

• Transport oxygen and carbon dioxide
• Distribute nutrients
• Transport wastes
• Distribute hormones
• Regulate body temperature

3
The Heart

• Cardiac cycle
• Systole ventricle contraction
• Diastole relaxation of all chambers following
  contraction of atria

4
Bloods Path Through the Heart - Deoxygenated

• Vena cava
• Right atrium
• Right ventricle
• Pulmonary Arteries
• Lungs

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Bloods Path Through the Heart - Oxygenated

• Lungs
• Pulmonary Veins
• Left atrium
• Left ventricle
• Aorta
• Body

6
Influence on Heart Rate

• Nervous system
• Hormones

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Functions of Blood

• Transport
• Nutrients
• Gasses
• Hormones
• Waste Products
• Immune Response

8
Blood Composition

• Plasma 55-60
• Red blood cells carry oxygen
• White blood cells - immunity
• Platelets clotting
• Blood is mostly saltwater!

9
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