Points to Remember

POINTS TO REMEMBER

* Cells are the basic structural and functional units of all living organisms.

* Cells are microscopic and can be seen only under a microscope.

* Cell membranes are selectively permeable, which means they only allow certain substances to pass in and out of the cell.

* Plant cells have a cell wall around the cell membrane that is rigid and provides support and protection to the cell content.

* The Cytoplasm includes the organelles and the cytosol. The Cytosol is the jelly-like medium, in which many chemical reactions take cell. Everything inside the cell membrane, except the nucleus, is considered to be the cytoplasm.

* Mitochondria are responsible for cellular respiration, which releases the energy from the food.

* Plants have chloroplasts with chlorophyll pigments to produce food by photosynthesis.

* Stem cells are cells that have the ability to divide and develop into many different types of the cell.

* A group of different tissues makes up an organ.

* Organs working together in groups form a systems or organ systems.

* Organ systems make up an organism, such as a human.