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Forces in and on the Human Body

الكلية كلية طب حمورابي     القسم الكلية ذات القسم الواحد     المرحلة 1
أستاذ المادة نادية حسين صاحب طاهر       04/11/2018 17:38:31


Forces in and on the Human Body

After the end of this lecture, the student must know:

1. The Fundamental Origins of Forces.

2• Types of Problems Involving Forces on Body.

3• Effects of the acceleration.



Important Forces


• Only the gravitational and electrical forces are importance in our study of the forces affecting the human body.

• The electrical force important at molecular and cellular levels, e.g. affecting the binding together of our bones and controlling the contraction of our muscles.

Gravitational force, though very much weaker than the electrical force by a factor 1039




How Forces Affect the Body



• The muscular forces that cause the blood to circulate and lungs to take in air.

• In the bones there are many crystals of bone mineral that require calcium. A calcium atom will become part of crystal if it gets close to a natural place for calcium and electrical forces are great enough to trap it.

Gravitational Force

• Newton’s law: These laws state that there is
a force of attraction between any two objects; our weight is due to attraction between the earth and our body.
• One important medical effect of gravitational force is the formation of varicose veins in the legs, as the venous blood travels against force of gravity on its way to the heart.


Electrical Forces in the Body

The forces produced by muscles are caused by electrical charges attracting opposite electrical charges.
Cells in the body has an electrical potential difference across the cell membrane.


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .