They are usually arranged into tissues. A tissue contains many cells all of the same kind and all doing the same jobs. You must know about a variety of animal cells for your GCSE exam, so here are some examples. This is a fairly typical animal cell. Like all other animal cells it has a nucleus, cytoplasm and a cell membrane.
Liver cells have many jobs.
These are cell organelles. Their job is to obtain energy from glucose by tissue respiration. Here is a diagram of a sperm. It is a single cell and just like other cells it has a nucleus, cytoplasm and a nucleus. It is specialised to carry genetic information.