The Transport System The Transport System In HumansIn Humans

HeartHeart

HEART

Main function is to pump blood Main function is to pump blood throughout the whole body throughout the whole body

The right side of the contains The right side of the contains deoxygenated blood while the left deoxygenated blood while the left side contains oxygenated blood.side contains oxygenated blood.

Three types of valves Three types of valves

TricuspidTricuspid valve found between the valve found between the right atrium and ventricle.right atrium and ventricle.

BicuspidBicuspid valve found between the left valve found between the left atrium and ventricle.atrium and ventricle.

Semi- lunarSemi- lunar valve found between the valve found between the right ventricle and the pulmonary arch right ventricle and the pulmonary arch as well as between the left ventricle as well as between the left ventricle and the aortic arch.and the aortic arch.

Right atrium

Right ventricle

Left atrium

Left ventricle

Median septum

Pulmonary artery

Aortic arch

Vena cava

Blood CirculationBlood Circulation

Deoxygenated blood from different Deoxygenated blood from different parts of the body is returned to the parts of the body is returned to the relaxed right atrium.relaxed right atrium.

from the upper parts of the body via from the upper parts of the body via the superior vena cava.the superior vena cava.

From the other parts of the body via From the other parts of the body via the inferior vena cava.the inferior vena cava.

When the right atrium contractsWhen the right atrium contracts tricuspid valve openstricuspid valve opens deoxygenated blood enters the relaxed right deoxygenated blood enters the relaxed right

ventricleventricle When the right ventricle contractsWhen the right ventricle contracts

Tricuspid valve closes to prevent the Tricuspid valve closes to prevent the backflow of blood into the atrium.backflow of blood into the atrium.

Semi-lunar valve opensSemi-lunar valve opens Blood enters the pulmonary arch which later Blood enters the pulmonary arch which later

divides into two pulmonary arteries carrying divides into two pulmonary arteries carrying the deoxygenated blood to the lungsthe deoxygenated blood to the lungs

BLOOD FLOWBLOOD FLOW

The pulmonary vein carries the The pulmonary vein carries the oxygenated blood from the lungs to the oxygenated blood from the lungs to the relaxed left atrium relaxed left atrium

When the left atrium contractsWhen the left atrium contracts bicuspid valve opensbicuspid valve opens blood enters the relaxed ventricle. The left blood enters the relaxed ventricle. The left

ventricle now contractsventricle now contracts bicuspid valve closes to prevent the backflow of bloodbicuspid valve closes to prevent the backflow of blood semi-lunar valve openssemi-lunar valve opens blood enters the aortic arch and is transported to all blood enters the aortic arch and is transported to all

parts of the body (except the lungs)parts of the body (except the lungs)

BLOOD VESSELS:BLOOD VESSELS:

There are three types of blood There are three types of blood vessels namely:vessels namely: arteryartery veinvein capillarycapillary

ArteriesArteries:: carry oxygenated blood away from the carry oxygenated blood away from the

heart except pulmonary artery.heart except pulmonary artery. VeinsVeins:: carry deoxygenated blood towards the carry deoxygenated blood towards the

heart except pulmonary veins heart except pulmonary veins Capillary:Capillary: connects artery and vein connects artery and vein allows materials in blood to be exchanged allows materials in blood to be exchanged

with the surrounding tissue with the surrounding tissue

Blood circulationBlood circulationWork sheet 2Work sheet 2

Fill in the blanks with the suaitable answer.Fill in the blanks with the suaitable answer. 1…………………. blood from different parts of the 1…………………. blood from different parts of the

body is returned to the relaxed right atrium.body is returned to the relaxed right atrium.

2. The pulmonary vein carries the ………….. blood 2. The pulmonary vein carries the ………….. blood from the lungs to the relaxed left atrium.from the lungs to the relaxed left atrium.

3. Three types of blood vessels are ………………, 3. Three types of blood vessels are ………………, …………….. and ………………… …………….. and …………………

4. ………………….. carry oxygenated blood away 4. ………………….. carry oxygenated blood away from the heart.from the heart.

5. ……………………….. carry deoxygenated blood towards 5. ……………………….. carry deoxygenated blood towards the heart.the heart.