The Cell and its Functions


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Lecture´s Description

Interested in learning about the basic structure and functional unit of human body? Here we present to you this V learning lecture entitled cell and its functions to serve the objective. From defining cell, its classification and organization to comparison of animal cell with precellular life forms, our medical specialist Dr Danial Qasim has elaborated every detail. Moreover, physical structure of cell, functional systems of cells along with their locomotion has been considered in-detail.

In this video lecture, educator defines the cell as smallest structural and functional unit of an organism. Cell can be divided into two classes as eukaryotic and prokaryotic cells. Cell must pass different levels of organization until it becomes organism.

Substances that make up the cell collectively called as protoplasm. Educator showed comparison of animal cell with precellular forms of life.

Physical structure of cell has membrane bounded organelles and cytoskeleton. Educator explained different parts of cell including cell membrane, endoplasmic reticulum, Golgi apparatus, lysosomes, mitochondria, nucleus and cytoskeleton.

The cell membrane is a biological membrane that separates the interior of all cells from the outside environment and has two types of membrane proteins.

The endoplasmic reticulum (ER) forms an interconnected network of flattened, membrane-enclosed sacs or tube-like structures known as cisternae. There are two types of ER. The Golgi apparatus is made up of membrane-bound sacs, and is also called a Golgi body, Golgi complex, or dictyosome.

Lysosomes are small vesicles surrounded by membrane containing digestive(hydrolytic) enzymes. The mitochondrion is a double membrane-bound organelle and provides energy to cell. Nucleus controls center of the cell. The cell's internal sub-structures, microfilaments and microtubules forms the cytoskeleton of the cell. 

Functional systems of the cell include pinocytosis, phagocytosis, synthesis of cellular structure, protein processing and secretion and extraction of nutrients by mitochondria etc. Important type of movement that occurs in body is of specialized muscle cells in skeletal, cardiac and smooth muscle.

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