A pap test is a screening test that can detect pre-cancerous and cancerous cells and processes in an important part of the female reproductive system, the cervix. It is at the secondary level of preventative care, because it screens asymptomatic individuals to detect as soon as possible a serious disease.
Pulmonary vein
Aorta
Pulmonary artery
Vena cava
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The subatomic particles located inside of the nucleus of an atom consist of protons and neutrons.