موضوع عن جسم الانسان بالانجليزي

برزنتيشن عن body language

برزنتيشن عن لغة الجسد بالانجليزي

برجراف عن الجسم

برجراف عن your body بالانجليزي

short presentation about body language

برجراف عن جسم الانسان بالانجليزي

body language presentation powerpoint

موضوع عن جسم الانسان بالانجليزي

مقدمة عن لغة الجسد

موضوع عن جسم الانسان بالانجليزي

برجراف عن جسم الانسان بالانجليزي

برجراف عن الجسم بالانجليزي

اعضاء الجسم الداخلية بالانجليزي

اعضاء الجسم بالانجليزي مترجم بالعربي

اعضاء الجسم بالانجليزي للاطفال

اسماء اعضاء الجسم بالانجليزي بالصور

اعضاء جسم الانسان التناسلية بالانجليزية

اجزاء جسم الانسان بالتفصيل

برجراف عن الجسم بالانجليزي

موضوع عن صحة الجسم بالانجليزي

اعضاء الجسم الداخلية بالانجليزي

اعضاء الجسم بالانجليزي مترجم بالعربي

اعضاء الجسم بالانجليزي للاطفال

اسماء اعضاء الجسم بالانجليزي بالصور

اسماء اعضاء الجسم الداخلية والخارجية بالانجليزي

اعضاء جسم الانسان التناسلية بالانجليزية

اجزاء الوجه بالانجليزي

اجزاء الجسم بالانجليزي للاطفال

اجزاء جسم الانسان بالصور للاطفال

اجزاء جسم الانسان بالتفصيل

اسماء اعضاء الجسم كاملة

اجهزة جسم الانسان بالانجليزي

The human body is the cultural and physical structure of the body of a human being. The human body consists of several systems and more than 600 muscles and more than 200 bones.

Definitions

An organ is a structural and functional entity composed of different tissues endowed with complementary capacities and performing a specific function but having meaning only within a system.

conventions

To make the description comprehensible, anatomy must set out a number of conventions:

• The reference position is that of the standing subject, whose upper limbs hang down the body with the palms facing forward. Thus the notions of superior, inferior, anterior and posterior become the same for all.

• There is still a need to develop orientation plans:

• the frontal plane is a vertical plane parallel to the front;

• the median sagittal plane is a vertical plane that passes through the sternum and spine. It divides the body into two symmetrical parts. The other sagittal planes are parallel to the median sagittal plane. An anatomical structure is called external when it moves away from the median and internal plane when it approaches it;

• the transverse plane is a horizontal plane perpendicular to the vertebral column.

• The position of a structure along a limb is defined by the terms proximal (near the root of the limb) and distal (away from the root of the limb). The position of a structure located near the skin is called superficial. It is described as deep when the structure considered is located away from the skin.

Life of different human cells

This section is empty, insufficiently detailed or incomplete. Your help is welcome!

In 2005, a team from the Karolinska Institute in Stockholm measured the age of human cell groups, based on the amount of carbon 14 present in the DNA. The conclusions of the report are that:

• The lifetimes of cell types are very variable, such as 2 weeks for epidermal cells, 4 months for red blood cells, a few hours for cells in the intestine wall, while the other intestinal cells have a duration of average life of 16 years, or the cells of the cortex that would have the age of the individual11,12. It is the cornea of ​​the eye that has the shortest life span, and therefore renews itself the fastest, in any mammal, including man (within 7 days maximum).

• The various factors responsible for natural aging are complex to identify; certain elements are nevertheless considered as being able to determine with more or less accuracy the process of degradation of the human body. Among these, the action of free radicals on the cells can be identified. These are oxidizing substances produced by a normal metabolism. These include the superoxide anion (O2-), hydrogen peroxide (H2O2) and the hydroxyl radical (.OH) 13,14. It should be emphasized that these naturally occurring substances also occur when a person is exposed to radioactive radiation, and that they are mutagenic, that is, capable of causing cancer.

• Aging is a process of oxidation of body cells, whose regeneration cycles are estimated to last approximately 60 years. Medicine, or progress in hygiene, has made it possible to prolong life expectancy, by slowing down the oxidation of cells15.

Thus, the adaptability of cells with the environment in which they operate is considered to be a major factor influencing life expectancy.