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TRANSPORT IN HUMANS

Components of Blood:
Platelets
The remains of dead cells
No nucleus and don't behave like normal cells

1. Platelets help to make tiny fibres that form a net
2. Red blood cells get trapped in the net
3. The clot dries, forming a scab which protects the…

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Plasma
The blood fluid
Mostly made of water
Some substances can dissolve in it
Carries the 3 other types of blood cells
Both useful substances (eg digested food) and waste substances (eg
CO and urea) dissolve into plasma and are transported around the body
55% of blood




CORONARY ARTERY
There…

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Stages of a Heartbeat:


Stage one:

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Stage two:




Stage three:




Normally the heart beats about 70 times a minute. When
exercising, the cells in the body need more glucose and O for
aerobic respiration, so the heart pumps the blood around
quicker. When adrenaline is secreted from the adrenal glands,
our heart rate increases as well.…

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ARTERY:
Function: Carry blood away from the heart at high pressure
Adaptations:
Thick wall (due to high pressure)
Thick inner layer of muscle and elastic fibres
Narrow lumen (to increase pressure)




VEIN:
Function: Return blood to heart at low pressure
Adaptations:
Thin wall (due to low pressure)
Thin inner layer…

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The Circulatory System:

CAROTID ARTERY
RENAL VEIN
HEPATIC PORTAL VEIN
HEPATIC VEIN
VENA CAVA
PULMANORY ARTERY
JUGULAR VEIN
RENAL ARTERY
INTESTINAL ARTERY
HEPATIC ARTERY
AORTA
PULMANORY VEIN

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