The Circulatory System
Functions of blood
Transport
Carries oxygen, nutrients and hormones to cells
Carries waste back from them
Water
CO2
Defence
Destroys bacteria
Destroys blood clots
Controls body temperature
37 degree
Composition of blood
Plasma
Liquid of blood
Transports and carries
Red blood cells
Red: haemoglobin
Carries oxygen
no nucleus
Platelets
Clots blood
no nucleus
White blood cells
Fights infections
Makes anti-bodies or engulfs the infection
Nucleus
Blood vessels
Artery: carries blood away from the heart
Thick wall
Small lumen
High pressure
No valves
Goes away from heart
High in O2
Veins: carries blood to the heart
Thin wall
Big lumen
Low pressure
Valves
Goes to heart
Low in O2
Capilaries: links arteries to veins
Very tiny wall
Tiny lumen
Low pressure
No valves
Artery to vein
Heart
The heart is a pump
Cardiac: to do with heart
Pulse
Pressure of blood in arteries
72 bpm
Can be effected by:
Age
Diet
Gender
Stress
Exersise
Why does the pulse increase with exercise
Exercise needs energy
More respiration
More toxic Co2 made
Pump blood faster to get rid of the Co2
More O2 and food is brought to the cells for respiration
The Circulatory System
Functions of blood
Transport
Carries oxygen, nutrients and hormones to cells
Carries waste back from them
Water
CO2
Defence
Destroys bacteria
Destroys blood clots
Controls body temperature
37 degree
Composition of blood
Plasma
Liquid of blood
Transports and carries
Red blood cells
Red: haemoglobin
Carries oxygen
no nucleus
Platelets
Clots blood
no nucleus
White blood cells
Fights infections
Makes anti-bodies or engulfs the infection
Nucleus
Blood vessels
Artery: carries blood away from the heart
Thick wall
Small lumen
High pressure
No valves
Goes away from heart
High in O2
Veins: carries blood to the heart
Thin wall
Big lumen
Low pressure
Valves
Goes to heart
Low in O2
Capilaries: links arteries to veins
Very tiny wall
Tiny lumen
Low pressure
No valves
Artery to vein
Heart
The heart is a pump
Cardiac: to do with heart
Pulse
Pressure of blood in arteries
72 bpm
Can be effected by:
Age
Diet
Gender
Stress
Exersise
Why does the pulse increase with exercise
Exercise needs energy
More respiration
More toxic Co2 made
Pump blood faster to get rid of the Co2
More O2 and food is brought to the cells for respiration