Blood pressure throughout systemic circulation

Systolic pressure - diastolic pressure = pulse pressure 

Therefore, using the average values of 120 mmHg (systolic) and 80 mmHg (diastolic), the pulse pressure is 40 mmHg  

Therefore, using these same values, the MAP is 93 mmHg  

At rest, the MAP is closer to the diastolic pressure because the diastolic phase of the cardiac cycle lasts almost twice as long as the systolic phase. During exercise when heart rate increases and the length of diastole decreases, systolic pressure contributes more to the MAP. 

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Blood pressure is the force within arteries that drives the circulation of blood throughout the body. Blood pressure in the body is analogous to water pressure in a plumbing system. Just as water pressure pushes water through the pipes to faucets and fixtures throughout a house, blood pressure pushes blood to muscles and other tissues throughout the body. However, unlike the water pressure in a plumbing system— which is typically nearly constant—our blood pressure varies with each heartbeat. 

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