What are the upper parts of the heart called?

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.

State the differences between artery, vein and capillary.

What are the lower parts of the heart called?

What is the name of blood vessels which connect arteries to veins?