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๐Ÿ“š > Physiology > Cardiovascular System > Arteries and Veins_>

Blood Pressure Along the Vascular Circuit

Pressure Along the Vascular Circuit

  • Systemic Circulation

  • Artery: 95 mmHg

  • Arteriole: 60 mmHg

  • Capillary: 25 mmHg

  • Venule: 15 mmHg

  • Vein: 15-3 mmHg

  • Pulmonary Circulation

  • Artery: 15 mmHg

  • Capillary: 10 mmHg

  • Vein: 5 mmHg

  • Pressure in systemic circulation are higher than those in pulmonary circulation.

  • High-pressure system includes

  • Systemic arteries

  • Systemic arterioles

  • Left ventricle in its contracted state

  • Low-pressure system includes

  • All the remaining part of the circuit, including pulmonary circulation

  • Left ventricle in its relaxed state

Relation Between Resistance and Pressure

  • Pressure drop at any level depends on resistance at that level.

  • The more the resistance โ†’ the more the pressure drop.

  • Arterioles provide the greatest resistance โ†’ greatest pressure drop occurs at arterioles.

  • Why capillaries do not provide greater resistance in spite of having a smaller diameter?

  • Answer: Because capillaries are large in number โ†’ total cross-section area of all capillaries combined is larger than that of arterioles โ†’ capillaries provide lesser resistance.


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โ–ถ๏ธ Resistance to Blood Flow
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