Multi-Cellular Vs Unicellular Organisms Essay

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

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.

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

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 circulatory system is more important for multi-cellular organisms, for example, in humans and in animals. The circulatory system is essential to provide oxygen to all cells within the body. The (Texas Heart Institute, 2015) has argued that cells in the body require a continual supply of oxygen to remain active, to ensure that the cells are not exposed to the air, to allow the circulatory system to provide with enough oxygen.

* Cells allow things to go in and out of the organism (allows diffusion to happen so good things go in and bad things go out)

the cells of the body receive oxygen and transport it around the body and expel the CO2.

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 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

The respiration system is the process of supplying oxygen to the cells so that cells can metabolise energy. The main functions of the respiratory system are to maintain oxygen supply to cells, to remove water from the body, and to remove carbon dioxide from the body.

The cell is the smallest unit able to sustain life, and they are often referred to as the building blocks of life. There are two primary types of cell, which are categorized according to the way their genetic material is packaged, rather than size or shape. These are:

All organisms need to respire to survive. Respiration requires oxygen which is brought into the body during gas exchange. In gas exchange oxygen is taken from the water or air into the bloodstream and carbon dioxide is released.

Multi cellular organisms have a much smaller surface area to volume ratio. Many of their cells are not in contact with their surroundings so they con not only rely on diffusion to supply all their organs with oxygen and nutrients, as the distance from their surface to all cells is too fare. We are multi cellular and have special surface for gaseous exchange and for obtaining nutrients. However Single celled organisms are small, which means that their surface area is large compared with their volume; they have a large surface area to volume ratio. Therefore they can obtain substances by diffusion through their relatively large plasma membrane. These substances have to diffuse only short distance so can diffuse at a faster rate and meet the organism’s

The respiratory system and circulatory system are both critical to the life of a mammal. The respiratory and circulatory systems depend on each other greatly. An organism needs both systems to be functioning in order to sustain life. Oxygen needs to be exchanged throughout the body, and the respiratory system and circulatory system are the modes of transportation for the oxygen. The respiratory system establishes the breathing of an animal by the transfer of oxygen, which in return allows the circulatory system to work. According to Barilleaux (2014), the gap between respiratory tissues and aerobic tissues was bridged by the circulatory system.

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