Tma1

TMA 1

1.1 Describe the four basic human body structure units and their functions.

The four basic human structure units are :

* Cells * Tissues * Organs * Systems

Cells : These are the basic structural unit of the body that maintain life. Every person consists of billions of cells that perform a infinite number of tasks in order to maintain the continuation of life. These live independently and can reproduce themselves. A cell also comes in different shapes and sizes depending on their function within the stability of life, for example, a mature red blood cell is less than 1mm in diameter and their function is to transport oxygen around the body.

Tissues : Tissue is a collection of cells, not identical but a similar function, specialised to perform a specific function. Tissue comes in many different forms including blood, muscle, glands and bone(such as cartilage). These can also form nerve tissue to which are cells that specially conduct electrochemical nerve impulses throughout the body.

Organs : All organs are formed when tissue combines with other forms of cells. This then gives you a structural unit, for example, a heart, that perform a specific function. Other examples of organs include the eye, liver, stomach, testis, uterus and kidneys all with their own particular function in sustaining life.

Systems : System are cells, tissues and organs all working together to get a final outcome. For example, your digestive system needs a mouth, because without it the system is floored and no food etc. can enter. In the digestive system you require everything from a place to intake the food, process the food and ejection of the waste product and that process must be followed in order for the system to