| Hypertension is the medical term for
persistent and sustained high blood pressure. It is one of the most
{{U}} (51) {{/U}} forms of heart disease. An understanding of blood
pressure in {{U}} (52) {{/U}}, healthy individuals is necessary in order
to understand hypertension. Blood pressure is simply the force {{U}} (53) {{/U}} against the walls of the body’s arteries (血管) as blood flows through. The force, produced primarily by the pumping {{U}} (54) {{/U}} of the heart, is essential for the {{U}} (55) {{/U}} of the blood and its life-supporting nutrients(营养) to all parts of the body. Every time the heart {{U}} (56) {{/U}}, called a systole, blood pressure increases. When the heart relaxes {{U}} (57) {{/U}} beats(diastole), the pressure decreases. The normal systolic pressure of a person at vest is between 100 to 140, and the norma A. exerted B. exercised C. stimulated D. aroused 我来回答: 提交
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