AP BIOLOGY

Detailed explanation-1: -Systolic blood pressure is measured when the heart ventricles contract. Diastolic blood pressure is measured when the heart ventricles relax. A systolic pressure of 115 millimeters of mercury is considered normal, as is a diastolic pressure of 70.

Detailed explanation-2: -The pressure of blood inside the arteries during ventricular contraction is called systolic pressure. The normal systolic pressure is about 120 mm of Hg and the normal diastolic pressure is 80 mm of Hg.

Detailed explanation-3: -The top number, or systolic pressure, refers to the pressure inside the artery when the heart contracts and pumps blood through the body. The bottom number, or diastolic pressure, refers to the pressure inside the artery when the heart is at rest and is filling with blood.

Detailed explanation-4: -Systole is when the heart muscle contracts. When the heart contracts, it pushes the blood out of the heart and into the large blood vessels of the circulatory system. From here, the blood goes to all of the organs and tissues of the body. During systole, a person’s blood pressure increases.

Detailed explanation-5: -During systole, ventricular pressure eventually exceeds aortic pressure, at which time the aortic valve opens, blood is ejected into the aorta, and ventricular volume decreases during theejection phase of the cycle.