Q39 of 367 Page 73

How many types of blood vessels are there in the human body? Name them.

There are three types of blood vessels are found in human body. These are arteries, veins and capillaries.


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37

Why do some people need to use a dialysis machine ? What does the machine do?

 38

What is the liquid part of the blood called? What is the function of platelets in the blood?

 39

Why does the heart need valves?

 40

A dialysis machine contains long tubes coiled in a tank containing dialysing

(i) Of what substance are the tubes made ?


(ii) What does the dialysing solution contain?


(iii) Name the main waste which passes into the dialysing solution.