cell - the smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane. Microscopic organisms typically consist of a single cell, which is either eukaryotic or prokaryotic.

Beyond size, the main structural differences between plant and animal cells lie in a few additional structures found in plant cells. These structures include: chloroplasts, the cell wall, and vacuoles.

Differences between a plant and animal cells.

Chloroplasts' main role is to conduct photosynthesis, where the photosynthetic pigment chlorophyll captures the energy from sunlight, and stores it in the energy storage molecules ATP and NADPH while freeing oxygen from water.
The cell wall is used in both protection and structure. The plant cell wall consists of three layers.
Vacuoles might store food or any variety of nutrients a cell might need to survive. They can even store waste products so the rest of the cell is protected from contamination.

The main function of the muscular system is movement. Muscles are the only tissue in the body that has the ability to contract and therefore move the other parts of the body. Related to the function of movement is the muscular system's second function: the maintenance of posture and body position.
Bones provide a framework for the attachment of muscles and other tissues. Protection: Bones such as the skull and rib cage protect internal organs from injury. Movement: Bones enable body movements by acting as levers and points of attachment for muscles.
Blood has three main functions: transport, protection and regulation. Blood transports the following substances: Gases, namely oxygen (O2) and carbon dioxide (CO2), between the lungs and rest of the body. Nutrients from the digestive tract and storage sites to the rest of the body.

Cells are the basic structure of life which make up tissues in which make up organs then make up organ systems which help carry out life's basic tasks.

Digestive System - The organs and glands in the body that are responsible for digestion. The digestive system begins with the mouth and extends through the esophagus, stomach, small intestine, and large intestine, ending with the rectum and anus.
Circulatory System - It is responsible for transporting materials throughout the entire body. It transports nutrients, water, and oxygen to your billions of body cells and carries away wastes such as carbon dioxide that body cells produce.
Respiratory System - is a biological system consisting of specific organs and structures used for the process of respiration in an organism.

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 which it returns to the lungs. Carbon dioxide diffuses from the blood into the lungs and it is then exhaled into the atmosphere.
The digestive system is dependent upon the respiratory system, because the digestive tract functions by using muscular contractions to break up food and move it along the tract. These muscles depend upon oxygen in order to function because without oxygen, the digestive tract would stop working.
Similarly, your 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.

labeled Paramecium

Paramecium are members of the phylum Ciliophora. They share many common characteristics with the rest of their phylum, but are also unique. For example, their shape is quite different from that of many other Ciliophora. They are also famous for their predator-prey relationship with Didinium. Paramecium are known for their avoidance behavior.

Function is to supply the blood with oxygen in order for the blood to deliver oxygen to all parts of the body.

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By Yuxuan.B