Which of the following statements about blood pressure is correct?
1
The normal systolic pressure is about 80 mm of Hg and diastolic pressure is 120 mm of Hg.
2
The normal systolic pressure is about 120 mm of Hg and diastolic pressure is 80 mm of Hg.
3
The normal systolic pressure is about 160 mm of Hg and diastolic pressure is 80 mm of Hg.
4
The normal systolic pressure is about 72 mm of Hg and diastolic pressure is 35 mm of Hg.