Date post: | 28-Dec-2015 |
Category: |
Documents |
Upload: | augustus-mclaughlin |
View: | 216 times |
Download: | 2 times |
Introduction to the Circulatory System
As a life function systemTRANSPORT
nutrients
O2/CO2
wastes
hormones
Immune factors
A CLOSED circulatory system has 3 basic parts
1. A pump
(Blood)
2. Some tubes
3. Something to pump
There will be…
(Heart)
(blood Vessels)
Arteries
• Carry blood AWAY from heart• Thick, elastic, muscular walls• Have a pulse
Gradually become smaller as they get farther away from the heart until they become arterioles
Capillaries
• Tiny, tiny, tiny (only a few blood cells at a time)
• Very thin walls “leaky”• Exchange of material
Blood
Body cells Environment
Capillaries
• Plasma portion of blood is “squeezed out”
• Becomes “Intercellular fluid”
• Some reenters capillaries, a lot is collected by lymphatic system