Cells and Tissues

A nucleotide is formed from a nucleoside and a phosphate group.

Mitosis involves somatic cells. Meiosis refers to the production of the sex cells.

“Messenger” RNA carries the data (the message) from the chromosomes in the nucleus to the ribosomes in the cytoplasm.

Adenosine triphosphate (ATP)

ATP production is the function of mitochondria.

Microfilaments occur inside the cell.

The names of the cells contain a description of their shape: either flat or like columns. Simple refers to a single layer of cells.

Mitochondria produce ATP. The other tasks are performed by lysosomes, ribosomes and endoplasmic reticulum, respectively.

Simple squamous. A single layer of flat (squashed) cells so diffusion through the layer takes place easily. Lines heart, lymph and blood vessels (known as endothelium). Called mesothelium when in serous membranes.

This is a definition of epithelial tissue.