Each part of the human body is engineered to do a job and for each job there is a particular structure engineered to do it. Homeostasis is the control of internal conditions, be it temperature, specific blood conditions or other variables within living organisms. The term ‘Homeostasis’ was first defined by the French physiologist, Claude Bernard, in 1865.The purpose of homeostasis is to provide a consistent internal environment for set processes to occur.
The body is started by a singular cell called the zycote cell, it contains all the essential factors for human development. The zycote cell subdivides into many smaller cells through the process mitosis. Cells are made up of plasma membrane which encloses organelles. Orgnelles are small organs which have individual and specialised functions and are often enclosed in their own membrane within the cell. All cells with the exception of red blood cells have a nucleus. The nucleus is thelargest organelle and contains the body’s genetic material. Most damaged and dead cells can be replaced aged cells are programmed to self destruct. Cells are thebody’s smallest functional units, grouped toether they form Body tissue. There afre four main tissues in the body, epithelium, muscle, connective and nervous tissue. * Epithelium tissue functions – protects from the outside word (skin), it absorbs (stomach and intestinal lining), filters and secretes * Muscle tissue functions – responsible for body movement, moves blood, food and waste through the body’s organs, responsible for mechanical digestion * Connective tissue – wraps and cushions organs, stores nutrients, internal support for organs, protects joints and attached muscles, gives strength * Nervous tissue – conducts impulses to and from the body via neurons
Water makes up around 60% of your body weight. The remaining fluid is made up of