Circulation

The heart pumps blood to the lungs for oxygenation as a part of the respiratory system and also pumps blood through the blood vessels of the body to supply oxygen and nutrients to the cells.

Some of the physical principles which apply to the circulatory system are:

• The measurement of blood pressure by the manometer principle which relates fluid pressure to liquid column height.
  通过将流体压力与液体柱高度联系起来的原理来测量血压。
• The relation of fluid pressure to volume flowrate in Poiseuille's law.
  泊肃叶定律中流体压力与体积流量的关系
• The relation of fluid pressure to vessel wall tension in LaPlace's law.
  流体压力与容器壁张力的关系（拉普拉斯定律）
• The electrical control of the heart by bioelectricity and the measurement by ECG.
  生物电对心脏的电生理控制及心电图测量。