Homeostasis is a process of where our body has to be able to control certain things such as body temperature and the water level so that they don’t change, therefore it is when it keeps things the same. It is how the body keeps the conditions inside, and some scientists refer to it as a constant internal environment; two examples of this is:
• Keeping the body temperature at 37 degrees,
• The amount of water in our body.
Our bodies are always making adjustments to be able to carry out normal bodily functions, but fortunately for us the adjustments are done automatically, if this wasn’t the case then we would all be very busy and would regulate our internal environment very ...view middle of the document...
Controlling body temperature:
Our bodies have two different mechanisms which control our bodies being too hot or too cold. When we are feeling really hot, the blood vessels which are supplying blood to the skin can swell or dilate, and this is known as Vasodilation. During this process, your body carries a lot of the heat energy around your body, there are also capillaries under the skin which can be filled with blood if you get too hot. This allows more warm blood to flow near the surface of the skin, where the heat can be lost to the air; this is why a lot of individuals look red when they’re too hot. Being too hot isn’t good for us, and many individuals can fall ill from being too hot, and many pass out, and this is why we have to cool ourselves down; this is done by sweating. When your body is too hot, the sweat glands are stimulated to release sweat, the sweat liquid turns into a gas and then evaporates, but to be able to do this, it needs to be warm, as it gets the heat from your skin; as your skin loses the heat, it also cools down. When we are feeling too cold, the blood vessels which are supplying warm blood to the skin become narrow or they get constricted which means they get shut off, this is known as Vasoconstriction, and is the opposite of vasodilation. During this process when the capillaries are ‘shut off’, it takes the blood away from the surface of the skin so that less heat is lost. Hairs on the skin also stand up, which is referred to as Goosebumps, but the technical term for it is piloerection. Also, this reduces the flow of warm blood near the surface of the skin, and reduces heat loss; this is why some individuals may looks pale/purplish when they feel too cold.
Breathing rate or also known as respiration is controlled by the nerve impulses from the respiratory centre in the brain which is called medulla. This centre also follows some of the principles of the negative feedback system and stimulates a change in the respirations when the chemo-receptors in the blood senses a fall or increase in the amount of carbon dioxide which is circulating the body, e.g. when exercising the receptors sense a high level of carbon dioxide in the blood stream and they send messages to the brain to increase and deepen the breathing rate so that the individuals is able to expel carbon dioxide and replenish oxygen. This is done by sending nerve impulses to the diaphragm, which then causes them to contract (when contacting it'll reduce size). The diaphragm will flatten and it goes lower, this then increasing the space for the lungs to be able to inflate so air is going into the lungs; this is called inspiration. The nerve impulses also affect the intercostal muscle, the intercostal music is between the ribs, these muscles are able to contract and life the ribs up and outwards, again to let the air into the lungs.
Everyone has cells within their body and there are tons of them, and the cells in our body's...