Transport in man
3.2.1
Describe the structure of human heart with labeled diagram
>Our
heart is a muscular organ about the size of our fist.
>The
heart is found in our chest.
>It
pumps oxygen-poor blood (deoxygenated blood) to the lungs and oxygen-rich blood
(oxygenated blood) to the body.
>There
are four chambers in our heart; two upper chambers called atria (singular atrium) and two lower
chambers called ventricles
>The
ventricles of our heart are larger than the atria.
3.2.2 Outline the flow of blood in the body
>Both
atria contract at the same time, and so the ventricles.
>The
blood passes from the atria into the ventricles.
>
There is a valve between each atrium and ventricle on the both sides of the
heart.
>
These valves keep the blood flowing in one direction.
>Deoxygenated
blood from the body enters the right atrium and oxygenated blood from the lungs
enters the left atrium of our heart.
> The
right ventricle pushes the blood to the lungs and the left ventricle pushes the
blood to the body.
3.2.4 Differentiate
among arteries, veins and capillaries on the basis of their function
|
Artries
|
Veins
|
Cappilaries
|
|
Carry blood away from the heart
|
Carry Blood towards the heart
|
They diffuse food and oxygen in cells and take away carbon dioxide
and wastes
|
|
Mainly carry oxygenated blood except pulmonary
artries
|
Mainly carry deoxygenated blood except pulmonary veins
|
Meet artries at one end and veins at the other
|
|
Have thick flexible walls
|
Thin walls with valves
|
Thinnest and smallest
|
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