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324092
Veins
Description
alevel Biology (Lifestyle, health and risk) Mind Map on Veins, created by giorgi.rebecca on 03/11/2013.
No tags specified
biology
lifestyle
health and risk
biology
lifestyle, health and risk
alevel
Mind Map by
giorgi.rebecca
, updated more than 1 year ago
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Created by
giorgi.rebecca
almost 11 years ago
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Resource summary
Veins
Carry blood back towards the heart
Tiny venules lead from the capillary network, merging into larger&larger vessels leading back to the heart
Eventually 2 veins carry the returning blood to the heart
Inferior vena cava (lower parts of the body
Superior vena cava (upper parts of the body)
Most veins carry deoxygenated blood
EXCEPTIONS
Pulmonary vein
It carries Oxygenated blood from the lungs back to the heart for circulation
During pregnancy
Umbilical vein carries oxygenated blood from the placenta from the fetus
Veins can hold a large quantity of blood
Blood pressure in veins is low
Blood pressure surges are eliminated as the blood flows through the capillary beds
HOWEVER blood needs to reach the heart at a low pressure
This happens using one way valves (SEMILUNAR VALVES)
Blood can flow towards the heart but not away from it as the contracted muscles relax, closing the semilunar valves
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