1. Cell: a microscopic functional unit of an organism
2. Animal Cells don't have a cell wall or chloroplasts like plant cells do and they have round shaped cells while plant cells have rectangular shapes
Chloroplasts are part of photosynthesis, a cell wall is for protection and function, and vacuoles hold materials and waste for the plant.
Muscle: the main function is movement but it also maintains posture and body position
Nerve: Transmits signals to different parts of the body using neurons
Cartilage: protects bones from rubbing against each other
5. Cells make up tissue, which makes up organs, and the organs make up organ systems that help us function
Components and Functions of the Systems:
The respiratory system takes in oxygen from the atmosphere and moves that oxygen into the bloodstream. The circulatory system then carries the oxygen to all the cells in the body and picks up carbon dioxide waste then returns it to the lungs. Carbon dioxide diffuses from the blood into the lungs and it is then exhaled into the atmosphere. The digestive system depends on the respiratory system because it functions by using muscular contractions to break up food and move it along the tract. These muscles depend on oxygen in order to function because without oxygen it would stop working. The respiratory tract wouldn't be able to function without the products of digestion. In order to inhale, the respiratory muscles must contract. Muscles need fuel in order to contract, and the efforts of the digestive tract provide the cells of the respiratory muscles with fuel.
It's like a mini version of a human's system. A paramecium is a small one celled (unicellular) living organism that can move, digest food, and reproduce. They live in water and move around and eat algae by using their cilia.