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Biology 3E
- Key Processes
- Blood is pumped at high
pressure away from the
heart in arteries. It travels
through networks of thin
capillaries, where it can
exchange materials with the
tissues. It's then collected up
and returned to the heart at
low pressure in veins
- The advantages of the double
circulatory system are higher pressures
and greater rate of flow to the tissues
- Blood is pumped at high
pressure away from the
heart in arteries. It travels
through networks of thin
capillaries, where it can
exchange materials with the
tissues. It's then collected up
and returned to the heart at
low pressure in veins
- Haemoglobin in red
blood cells reacts with
oxygen in the lungs to
form oxyhaemoglobin
- Oxyhaemoglobin
releases oxygen in
tissues to form
haemoglobin
- Blood moves
around the body
in arteries, veins
and capillaries
- Arteries transport
blood away from
the heart
- Veins transport
blood to the heart
- Capillaries exchange
materials with tissues
- Blood in arteries is
under higher
pressure than
blood in veins
- A double circulatory system
is one in which blood travels
to through the heart twice
during one complete circuit
- The right side of
the heart pumps
blood to the lungs
- The left side of the heart
pumps blood to the body
- The ventricles
pump blood
- The semilunar,
tricuspid and
bicuspid valves
prevent backflow
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