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ماظعلا ىلع ظافحلا نع ةلوؤسملا يه ماظعلا ايلاخ . تقولا لاوط نوريغتيو نوربكي مهنإ ةيح يمظعلا لكيهلا ماظع
. اهليكشتو اهومنو
بلاط يبا نب يلع ةسردم Biology 2022 T2 Mr Gamal kasem
The table below summarizes the function of each bone cell type.
Cell Type osteoblasts Osteocytes osteoclasts
Function form new bones maintain bone tissue break down bones

What is ossification? Ossification is the process by which new bone is produced.

ةديدجلا ماظعلا جاتنإ اهللاخ نم متي يتلا ةيلمعلا وه مظعتلا ؟ مظعتلا وه ام
When during life does ossification occur? Ossification begins about the third month of fetal

life. Bone growth continues until approximately age 25.
How do bones grow? In the early embryo, the skeleton is made of cartilage.During fetal
development, much of this cartilage is replaced by osteoblasts. During childhood and
adolescence, cartilage is gradually replaced by bone through ossification. By the age of 25,
nearly all cartilage is replaced by bone, and bones stop growing in length some cartilage

remains in the adult skeleton, such as in these: joints - rib cage - the discs between the
-

vertebrae outer ears the tip of the nose
-

Bone Remodeling and Repair What is bone remodeling? is a process where old bone tissue is
removed from the skeleton, and new bone tissue is formed.
When does bone remodeling occur? The bone remodeling process occurs throughout life
How do bones remodel? Bones remodel by the work of osteoclasts and osteoblasts.
Osteoclasts break down old bone, and osteoblasts make new bone.
نم ةميدقلا ماظعلا ةجسنأ ةلازإ متي ثيح ةيلمع يه ؟ ماظعلا نيوكت ةداعإ وه ام فلتلا حلاصإو ماظعلا نيوكت ةداعإ
لاوط ثدحي ماظعلا ءانب ةداعإ ةيلمع ؟ماظعلا ءانب ةداعإ ثدحت ىتم . ةديدج ةيمظع ةجسنأ ليكشت متيو ،يمظعلا لكيهلا
. ماظعلل ةينابلا ايلاخلا لبق نم اهليكشت ةداعإ ؟ اهليكشت ةداعإ متي فيك ةايحلا
. ةديدجلا ماظعلل ةينابلا ماظعلاو ،ماظعلل ةمداهلا ايلاخلا
Why do bones remodel? to replace old bone tissue, for
minor repair of bones, and to maintain normal calcium
levels in the body.
ةيمظعلا ةجسنلأا لحم لحتل ماظعلا ءانب ةداع ؟ماظعلا ءانب داعي اذامل
مويسلاكلا تايوتسم ىلع ظافحلاو ،ماظعلا نم ةفيفط حلاصلإ ،ةميدقلا بلاط يبا نب يلع ةسردم Biology 2022 T2 Mr Gamal kasem
مسجلا يف ةيعيبطلا
Bone Injuries What is a bone fracture? Fractures are
common bone injuries. What is a bone fracture? A
bone fracture is a crack or a break in a bone. What are
some common types of bone fractures? Bone fractures

are categorized based on their features. ماظعلا تاباصإ يه روسكلا ؟ماظعلا رسك وه ام ماظعلا تاباصإ
.ةعئاشلا
فينصت متي ؟ةعئاشلا ماظعلا روسك عاونأ ضعب يه ام . ماظعلا يف شودخ وأ رسك وه ماظعلا رسك ؟ماظعلا رسك وه ام
. اهحملام ساسأ ىلع ماظعلا روسك

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