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What might result from a blocked sebaceous gland? ؟ةينهدلا ةدغلا دادسنا نع جتني دق يذلا ام
1. acne بابشلا بح

A. sweat قرعلا
B. Baldness علصلا
C. ingrown hair يمانلا رعشلا

بلاط يبا نب يلع ةسردم Biology 2022 T2 Mr Gamal kasem

What protein do hair and nails contain? رفاظلا ا و رعشلا هيلع يوتحي يذلا نيتوربلا ام

A. Chitin
B. cutin
C. keratin
D. myosin
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The Skeletal System: Structure and Function

The Skeletal System The skeletal system forms the internal framework that
supports and protects your body.
The skeletal system consists of the bones, cartilage, and ligaments.
لكيهلا نوكتي . كمسج يمحيو معدي يذلا يلخادلا راطلإا يمظعلا لكيهلا لكشي يمظعلا لكيهلا
. ةطبرلأاو فيراضغلاو ماظعلا نم يمظعلا
Structure of the Skeletal System
There are 206 bones in the adult human skeletal system.

The human skeletal system consists of two divisions: @The axial
skeleton - includes the bones of the head, back, and chest.
@The appendicular skeleton - includes the bones that are related to the
movement of the limbs.
The Axial Skeleton
The axial skeleton of the adult consists of 80 bones.
The axial skeleton includes the @skull @ sternum @ ribs @ vertebral column

Functions of the Skeletal System
. Support and Protection shapes and supports the body protects the body’s tissues and
organs
MovementThe bones of the skeletal system work together with muscles to move the body.
Storage The bones store calcium and phosphorus.
The skeletal system helps maintain homeostasis by regulating the level of calcium and other
minerals in the blood.
Blood Cell Formation Blood cells are mostly made in the bone marrow of some bones. بلاط يبا نب يلع ةسردم Biology 2022 T2 Mr Gamal kasem

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