I think its 60 years old idk though
It pumps the blood in and out of the heart. If I remember right I think that’s it.
Gauze , cotton swabs , gloves hope this helps
The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils. Hope this helps.