Blood pressure of human body is measured only at the site of arm only, why

the heart supplies the organs and tissues of the body with blood with every beat  it pumps blood into the large blood vessels of the circulatory system the   Blood pressure readings are made up of two values:

systolic blood pressure is the pressure when the heart beats while the heart muscle is contracting and pumping oxygen rich blood into the blood vessels

diastolic blood pressure is the pressure on the blood vessels when the heart muscle relaxes the diastolic pressure is always lower than the systolic pressure

i think

1. continental slope

2. continental rise

3. continental shelf

mark me branliest, only got it 1 time

what subject is this