Transcript day 5 intro to circulation

Circulatory System
Function,
Components &
Parts of the heart
1
The circulatory system has 4
principle functions
1) Transportation of oxygen and carbon
dioxide (connect to respiratory system)
2) Distribution of nutrients and transport
wastes (connect to digestive system)
3) Maintain body temperature (homeostasis)
4) Circulate hormones (endocrine system)
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Circulatory System is also called
the CARDIOVASCULAR system
• Cardio = heart
• Vascular = vessels or tubes
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The cardiovascular system
consists of 3 general components
1) Blood: a fluid that transports nutrients,
wastes, oxygen, carbon dioxide and
hormones
2) A system of blood vessels that contain the
blood
3) The heart: the pump that pushes the fluid
through the blood vessels
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Two types of circulatory systems
1) OPEN Circulation
– blood flows freely within the body cavity
– blood makes direct contact with organs and
tissues
– insects & crustaceans
5
Two types of circulatory systems
1) CLOSED Circulation
– blood is contained in
vessels and separate
from other tissues
– keeps blood under
pressure
– earthworms, octopus &
mammals
6
The circulatory system
is 2 systems in 1
(double circulatory system)
• Pulmonary circuit:
right side of the
heart pumps blood
to the lungs where
blood picks up
oxygen
7
• Systemic circuit: the
left side of the heart
pumps blood to all
parts of the body
(blood drops off
oxygen)
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The Heart
Right VS Left
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Blood Flow
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Blood in body
Into heart via vena cava (vein)
Right atrium
(AV valve)
Right Ventricle
(Pulmonary valve)
Pulmonary artery (deoxygenated)
Capillaries surrounding alveoli - pick up oxygen
Lungs (becomes oxygenated)
Pulmonary vein
Left atrium
(AV valve)
Left ventricle
(Aortic valve)
Arteries (oxygenated towards body tissue)
Capillaries - drop off oxygen