3. •The main function of heart is to pump blood
all part of the body by its muscle`.
•the three main type of blood vessels are the
arteries ,veins and capillaries
4. •Arteries carry blood away from the heart to all
part of the body .
•Capillaries have tiny walls with small lumens
through which blood exchange substances
with the cells in the body.
5.
6. Veins carry blood back to heart . Veins
have values to ensure the one –way flow of
blood back to heart from the capillaries .
Blood transports a variety of substances
such as oxygen ,urea and hormones to all
part of the body.
7. Function of heart
• The circulation of blood in the blood circulatory
system of the follows ;
Blood flows from the heart to the lungs through an
artery and returns to the heart through a vein
Blood flows out from the heart to all other organs
through arteries and return through veins
12. • They are large than the red blood cells, irregular
in shape and have nuclei but the number of white
blood cell is less than red blood cell and the
function is kills microorganism.
• Platelets
They are very small pieces of broken cells are
irregular in shape . The function is to help in blood
clothing to stop bleeding.
15. 2.3 transpiration
transpiration is the process by which water is lost in the form
of water vapor from the surface of a plant into air by
evaporation.
Rate of transpiration
In plants is also affected by environment factors
Such as light intensity , temperature , humidity and wind .
16. Transporting system of the flowering plants
•Xylem which carries water and mineral salts
from the roots to the leaves .
•Phloem which carries food made in the leaves
to other plant
