The structure of the animal cell
The animal cell
The animal tissue is composed of small units called the animal cells , where each cell contains many components , The animal cells are various sizes and have irregular shapes , and most of the cell size range between 1 and 100 micrometers .
The plasma ( cell ) membrane
The plasma membrane is the outer membrane of the animal cell , It controls the substances that enter or leave the cell , and The cell membrane is made up of phospholipids which has polar ( hydrophillic ) heads and non-polar ( hydrophobic ) tails.
All the cell components are suspended in the cytoplasm which is a fluid that fills the cell , The cytoplasm maintains the pressure of the cell, and it ensures the cell doesn’t shrink or burst and all the biological operations of the cell occur in the cytoplasm .
The nucleus organizes the biological processes in the cell and it is responsible for the cell division , The nucleus is surrounded by a porous membrane known as the nuclear membrane , The nucleus controls the activity of the cell and is known as the control center.
The small vacuoles
The small vacuoles are bound by single membrane and small organelles , and they are storage organelles in many organisms .
The ribosomes are found freely suspended in the cytoplasm and they are attached to the endoplasmic reticulum , The ribosomes are found in large number in all cells as protein synthesis is very important to the cell , The ribosome is the site for protein synthesis where the translation of the RNA takes place .
The plant cell is characterized than the animal cell by the presence of the cell wall and the green plastides ( the chloroplasts ) , Both the animal and plant cells are similar in the presence of plasma membrane , cytoplasm and nucleus , The animal cell has an indefinite shape due to the absence of the cell wall .