Multi-Cellular Vs Unicellular Organisms Essay

2. Define multicellular organism - are those organisms containing more than one cell, and having differentiated cells that perform various functions.

Without the cells there will be no life. A cell is the the building block of the body. There 2 different types of cells there are animal cell and plants cells. Eukaryote is any cell that has a cell membrane bound. It also contains organelles.

The circulatory system and the respiratory system work closely together to ensure that organ tissues and systems receive enough oxygen. Oxygen is required for cellular functions such as cell respiration. This is so the body’s organs and cells can work at fully; it is done by releasing chemical energy with in stored foods. The air breathed in and held in the lungs is transferred to the blood. The blood is circulated by the heart, which pumps the oxygenated blood from the lungs to the body organs and returns with deoxygenated blood.

contrast the reasons cell division is important for unicellular and multicellular organisms. Cell division is the method in which single celled organisms reproduce. Cell division allows multi-cellular to grow and repair dead or damaged cells

The respiratory system is a complex organ structure of the human body anatomy, and the primary purpose of this system is to supply the blood with oxygen in order for the blood vessels to carry the precious gaseous element to all parts of the body to accomplish cell respiration. The respiratory system completes this important function of breathing throughout inspiration. In the breathing process inhaling oxygen is essential for cells to metabolize nutrients and carry out some other tasks, but it must occur simultaneously with exhaling when the carbon dioxide is excreted, this exchange of gases is the respiratory system's means of getting oxygen to the blood (McGowan, Jefferies & Turley, 2004).

Others were multicellular, and others had structures or organelles. It was hard to tell which one was which when it came to the

Mitosis happens in the reproduction of unicellular organisms and in the addition of cells to a tissue or organ in a multicellular organism.

Both unicellular and multicellular organisms use cell communication in order to elicit a response which helps an organism coordinate and respond to their environment. Cellular communication can occur through direct contact, local signaling, or long-distance signaling. For a response to occur, a message much reach a receptor that

Each single alveoli is wrapped with capillaries. Because of this, both the alveoli and capillaries are made up of a simple epithelium, which is a very thin tissue. This single layer of thin cells creates a short distance for gases to diffuse through. The oxygen will then be able to move through the thin capillary walls and into the cells while the carbon dioxide passes through the thin capillary walls from the cells. The short diffusions distance allows for a rapid gas exchange. This rapid and efficient gas exchange is required so that the cells can get the energy that they need for

The blood uses diffusion “to take in oxygen from the alveolar air spaces, provided there is more oxygen in the air spaces than in the blood. The oxygen diffuses across the alveolar walls into the blood. The circulation takes the oxygen-rich blood away and replaces it with blood that is low in oxygen” (The importance of homeostasis). In other words, the blood uses diffusion to transfer low oxygenated blood with oxygenated blood in order to further transport the oxygen rich blood to other places in the human body. The same process can also be used to explain the body’s ability to use osmosis as a way to absorb nutrients during

The way in which different organisms acquire oxygen in exchange for carbon dioxide has truly evolved. The exchange of carbon dioxide for oxygen is essential for the survival of organisms that need to produce the energy molecule ATP through the process of cellular respiration. Respiration (breathing) is the way organisms exchange gases with their environment (White and Campo 2004). During cellular respiration organisms break down energy rich macromolecules such as starch to make ATP in a chemical reaction where oxygen and water is involved (Ege R. and A. Krogh 1914).The use of oxygen is very important; therefore the efficient

The respiratory system is the process responsible for the transportation and exchange of gases into and out of the human body. As we breath in, oxygen in the air containing oxygen is drawn into the lungs through a series of air pipes known as the airway and into the lungs. As air is drawn into the lungs and waste gas excreted, it passes through the airway, first through the mouth or nose and through the pharynx, larynx and windpipe – also known as the trachea. At this point it then enters the lungs through the bronchi before finally reaching the air sacs known as alveoli. Within the lungs, through a process known as diffusion, the oxygen is transferred to the blood stream through the alveoli (air ducts) where it is then transported inside

Unicellular organisms are found in places such as ponds and lakes. Unicellular organisms are prokaryotic in nature and multicellular organisms which are most eukaryotic in nature. Another advantage that multicellular organisms have over unicellular organisms is that the outer cells are facing the environment; because the outer cells are facing the environment not all of the cells will become damaged, but instead the cells are able to replace their old cells with new ones. Such as our skin for an

A single celled organism which is also known as a unicellular organism which is an organism that only contains one cell for example some bacteria only have one cell and yeast only have one cell . On the other hand, a multicellular organism is an organism that is made up of loads of different types of cell for examples humans are multicellular, we are made of loads of different types of cells that help us function. The surface area to volume ratio of a single celled organism is larger compare to a multicellular organism and therefore unicellular organisms are able to rely on diffusion to transport substances in and out of the cell. Multicellular organisms cannot rely on diffusion; they rely on specialised transport exchanged surfaces like the gills for animals or lungs for a human. Most of the transport systems contain specialised cells to allow it to transport like vessels. Unicellular organisms do not have any transport system they rely on obtain oxygen by diffusion in the cells and carbon dioxide out of the cell. The distance from edge of cell to centre in a single celled organism is<0.5mmwhereas the large organisms depend of the surface area to volume ratio however, it is usually a low ratio as if it was a higher one then it would allow diffusion because diffusion will happen fast but multicellular organisms do not rely on diffusion therefore it must have a low surface area to volume ratio. Differentiation is the spreading of particles of a high

Metazoans are not just multicellular, they have different kinds of cells that perform different functions.