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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.…read more

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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 are many blood vessels surrounding the heart,
which transport all of the necessary substances (eg
Glucose and O) to the cells of the cardiac muscles
that pump the heart for respiration.…read more

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Stages of a Heartbeat:
Stage one:…read more

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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. The increased output supplies
extra blood to the muscles, enabling them to release extra
energy through aerobic respiration.…read more

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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 of muscle and elastic fibres
Wide lumen
Valves prevent backflow
CAPILLARY:
Function: Allow exchange of materials between blood and tissues
Adaptations:
Very thin wall (single layer of cells)
Narrow lumen (same diameter as red blood…read more

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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…read more

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