Chapter 4.7 - Science As A Human Endevour

Question 1

Varicose veins

Answer 1

expanded or knotted blood vessels close to the skin, usually in the legs. They are caused by weak valves that do not prevent blood from flowing backwards.

Question 2

Electrocardiogram (ECG)

Answer 2

graph made using the tiny electrical impulses generated in the heart muscle, giving information about the health of the heart