Fill in the blanks. 

(i) The blood from the heart is transported to all parts of the body by the [[1]] . 

(ii) Haemoglobin is present in [[2]] cells. 

(iii) Arteries and veins are joined by a network of [[3]] . 

(iv) The rhythmic expansion and contraction of the heart is called [[4]] . 

(v) The main excretory product in human beings is [[5]] . 

(vi) Sweat contains water and [[6]] . 

(vii) Kidneys eliminate the waste materials in the liquid form called [[7]] . 

(viii) Water reaches great heights in the trees because of suction pull caused by [[8]] .