This youtube video was mainly focused on the introduction to the cell. What I learned from this video is that us humans are built of billions of animal cells. According to the Modern Cell Theory, the cell is the smallest living unit in all organisms and all living things are made up of cells. Humans are multicellular meaning that we consist of multiple cells. I can’t forget to mention that all cells come from other pre-existing cells. Cells have many functions, they can carry DNA, they can divide and they have certain functions that their organelles can take care of. We can split cells into two major groups, prokaryotes and eukaryotes. Prokaryotes are archaea and bacteria. Eukaryotes are fungi, animals, protists and plants. Prokaryotes and eukaryotes share some similarities and differences. They both have DNA but prokaryotes do not have a nucleus and eukaryotes do, they both have ribosomes which make protein, they both have cytoplasm, they both have cell membranes but plants have an additional cell wall for extra protection, they both have organelle and lastly eukaryotes are membrane bound and prokaryotes are not. Then it went into talking about Endoplasmic Reticulum also known as ER. There are two types of ER, rough ER and smooth ER. The difference between the two is that rough ER contains ribosomes which make it “rough” and smooth ER does not.