The largest cell, a fertilized egg, is too small to be seen with the naked eye
A cell membrane holds the organelles inside of the cell. The structure and composition of the cell membrane solely depends on the cell type.
Groups of cells form tissues and organs.
Red blood cells carry oxygen around the body. They are created and stored inside the bone marrow of your bones.
Within the cell membrane is two major compartments, the cytoplasm, and the nucleus. The cytoplasm contains all the cellular organelles and holds the structures that consume and transform energy and perform the cell’s functions. The nucleus contains the cell’s genetic material (DNA) and the structures that control cell division and reproduction.
The longest cells in the human body are the motor neurons. They can be up to 4.5 feet (1.37 meters) long and run from the lower spinal cord to the big toe.
Each cell has a different set of functions. Some cells move throughout the body, like blood cells. Others are attached to one another like muscle cells, and they stay in one place. Some cells, like skin cells, divide and proliferate quickly. Nerve cells do not divide or reproduce except under usual circumstances.
Even though there are different types of cells, most of them have the same components. A cell consists of a nucleus and cytoplasm which is contained within the cell membrane.
Stem cells are a group of cells that can constantly divide and reproduce. Every organ has its own specialized stem cells.
Another important cellular organelle is the mitochondrion. Inside every cell are mitochondria. Mitochondria are tiny structures that provide the cell with energy and thus known as the powerhouse of a cell.
All living organisms are made up of cells. Plants and animals have different kinds of cells. Basically, the cell is composed of proteins and organelles such as the nucleus, mitochondria, Golgi, Endoplasmic reticulum, etc.
The cell membrane regulates the passage of any molecules in and out of the cell.
