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BLOOD AND ITS COMPONENTS What do you think that blood is made
out of?
Are there different blood cells?
What are these cells called?
PLASMA Plasma is the yellowish fluid in the blood It is in the plasma that nutrients are
transported Contains proteins that help in blood
clotting Also keeps the body at its optimum pH
level
BLOOD CELLS The three types of blood cells are:
Red Blood cells (erythrocytes)White blood cells (leukocytes)Platelets (partial blood cells)
Do you know what each of these cells do?
RED BLOOD CELLS Red blood cells are used to transport
oxygen around the body.
What is the structure called to transport oxygen on red blood cells?
Return to cells slide
HAEMOGLOBIN Haemoglobin is the carrier molecule on
RBC to carry oxygen
When oxygen is attached it is called oxy-haemoglobin.
Return to RBC slide
Return to Blood cell slide
HAEMOGLOBIN With haemoglobin the red blood cells can
carry 20mL of oxygen per 100mL of blood.
This is about 70 times what they could carry without haemoglobin!
WHITE BLOOD CELLS White blood cells are very useful as they
assist the body in fighting infection. This is what is attacked in the infection
HIV.
Return to cell slide
PLATELETS Platelets are partially broken down red
blood cells that are used to clot blood. Ie they form scabs and stop us from
continually bleeding.
Return to cell slide
FUNCTIONS OF THE CARDIOVASCULAR SYSTEM Transport: Water, Oxygen and Carbon
dioxide
Distribution of nutrients
Waste removal
Maintaining body temperature
THE HEART Made of specialised muscle which allows
blood to be pumped all around the body
Where do you think that blood needs to go?
Blood travels in structures called veins, arteries and capillaries, these are called blood vessels.
BLOOD VESSELS Arteries: carry oxygenated blood and
move away from the heart
Veins: move to the heart and carry deoxygenated blood.
Capillaries: Site of blood “cross-over”. Nutrients exchanged.
AMOUNT OF BLOOD Average humans have 5L of blood.
Does anyone know how much blood the heart pumps?
Do you know how much of this 5L is in plasma and how much is blood cells?
AMOUNT OF BLOOD The heart pumps 5L of blood per minute
55% of blood is plasma 45% of blood is blood cells