Tuesday, March 12, 2019
What is homeostasis?Homeostasis is the mechanism in our carcass that regulates and maintains a stable and constant environs. This enables our frame to respond to changes in the environment almost us as. The homeostatic mechanisms in our soundbox, observe and proctor conditions and will then make a judgment whether to change the fashion the body functions is order to adapt to the outside surroundings better. The main variety meat involved in homeostasis atomic number 18 the wizard, liver, skin and kidneys. The skin is involved as its acts as a protective layer and also regulates body temperature. The liver breaks piling harmful substances and the kidneys regulate water take aims and waste products. In the spirit the hypothalamus controls everything and changing them to fit into the outside surroundings. Negative feed stake is also linked in as it is the parade of homeostasis. It is negative because it is in a negative web site and will not kick it unless theres somethin g wrong.Body temperatureWhen we forge the body has to wrench harder, the body temperature would annex this is due to organs having to work harder to force back oxygen to muscles. The metabolic say that produces more energy has to increase in order for more energy to be released. The sum of money has to centre more note line around the body in order to portray oxygen to the working(a) muscles so they send away carry on working at that capacity. What mechanisms argon there to cool the body down?Sweating-glands are stimulated to release sweatLiquid turn into gasVasodilation-your body carries most of the hotness energy around your body There are capillaries underneath your skin that can be filled with rent if you study too hot This brings the blood closer to the surface of the skin so more heat can be lost, this is why we look passing when were hot. What mechanisms are there to warm the body up?Vasoconstriction-this is the reversion of vasodilationThe capillaries underne ath your skin get constricted (shut off) so less heat is lost Piloerection- this is when the hairs on your skin stand upThe hairs trap a layer of air succeeding(a) to the skin which is then warmed by the body heat.Heart rateThe spunk rate is controlled by the involuntary nervous system. This system however, is split into two, the sympathetic nervous system and the parasympathetic nervous system system. The sympathetic system is in charge of speeding up the heart rate when its rented and the parasympathetic system is there to faint the heart rate down. There are many reasons why heart rate could increase the main and obvious reasons are fear, stress and employ. wreak is one of the main reasons why heart rate would increase as when we exercise we need more oxygen to travel to our working muscles. group O is only carried in the blood and the main organ for the blood essenceing around the body is the heart. This is when the sympathetic nervous system comes in the receptors tel l the brain that we are doing exercise and then the brains im varys a inwardness to the heart to pump faster, in order for more oxygen to be transported in the blood to the working muscles. When we are not doing exercise we have a railyard maker of the heart. This pace maker called the Sino atrial node keeps a systematic heart beat. We have tested our Sino atrial node by starting line of all doing exercise to see our risen heart rate, exploit was 13. later 5 minutes of rest our Sino atrial node should have kicked in and our regular heart beat will be taking place, mine was now 11. The negative feedback systemChange in the bodys external environment, the brain receives a message exercise Change in bodys internal systemReceptors detect change and send messages to the brainThe brain organises internal and external body changes to bring the environment back to normalBreathing rateBreathing rate is unconquerable by the amount of breaths taken during a certainperiod of time. This can increase during exercise or any physical activity or trauma. The way in which the body recognises this is by the chemo-receptors. They send a message to the brain, which then sends a message to the heart to pump more blood by beating faster, this is because they have detected a change in the amount of carbon dioxide that is circulating the body. When the chemo-receptors detect a full(prenominal) level of carbon dioxide, they send a message to the brain to increase or decrease breathing rate in order to get discharge of carbon dioxide or to replenish the amount of oxygen in the body. What happens next is very clever in the fact that the body recognises that during exercise we need more oxygen. Therefore messages in the form of nerve impulses are send to the diaphragm causing it to contract. When the diaphragm contracts it lowers itself in order for the ribs to expand and fail upwards so there is increased space for the lungs to inflate. The muscle that allows the ribs to bm up and out is called the inter costal muscle. This process of breathing rate is called inspiration. When we exhale the reverse happens to what has just been explained. The diaphragm relaxes and returns to its original position. The inter costal muscle that allows the ribs to move up and out also relaxes and returns the ribs to their stationary position. This process is known as expiration.Blood glucoseBlood glucose is simply the control of excoriation levels in the body, and determines when the body needs more glucose (sugar) or when it needs less. The part of the body that controls the glucose is the pancreas. The pancreas releases insulin which is made to lower blood sugar levels when it gets too high but can also create glucagon that brings the blood sugar levels up when they are too low. Blood sugar levels mainly are unnatural and altered by the food we eat. Before a meal our blood sugar levels will be running low but afterwards were eaten our blood sugar levels will be a se rve higher, and in many cases will need the help of insulin to bring them down to the normal level, between 4 and 8ml, if we have consumed too much. The process of how we get the sugar is from the food we eat, mainly by the carbohydrates we consume. Carbohydrates are taken into the body by the food, and are then digested and changed into glucose that the body can use for energy. During exercise blood sugar levels will fall below our normal, so our body receptors say level ofglucose in the body is too low and thus will tell the pancreas to produce glycogen to bring our sugar levels back up.