Which of the following parts in the human body cannot be infected by a virus? a) none of the above, as they can all be infected by virusesb) blood cellsc) braind) skeletal muscle

A none of the above, as they can all be infected by viruses

the last statement is correct i.e.

when your heart is not pumping enough blood around your body because your heart is severely failing, you may need an artificial heart. an artificial heart is a mechanical device, about the size of an orange, that is connected to your heart or implanted in your chest to or replace a failing heart.

which ever one is showing doing the same exercise in time intervals such as 30 seconds or a minute several times.