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Homeostasis Essay

Essays on Homeostasis

❶In the event of low levels of glucose, the alpha-cells of the pancreas release the hormone glucagon to stimulate skeletal muscle and the liver to breakdown glycogen into glucose and adipose tissue to digest lipids into fatty acids and glycerol. The process of how we get the sugar is from the food we eat, mainly by the carbohydrates we consume.

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The homeostatic mechanisms in our body, observe and monitor conditions and will then make a judgment whether to change the way the body functions is order to adapt to the outside surroundings better. The skin is involved as its acts as a protective layer and also regulates body temperature. The liver breaks down harmful substances and the kidneys regulate water levels and waste products. In the brain the hypothalamus controls everything and changing them to fit into the outside surroundings.

Negative feedback is also linked in as it is the process of homeostasis. Body temperature When we exercise the body has to work harder, the body temperature would increase this is due to organs having to work harder to get oxygen to muscles.

The metabolic rate that produces more energy has to increase in order for more energy to be released. The heart has to pump more blood around the body in order to deliver oxygen to the working muscles so they can carry on working at that capacity.

What mechanisms are there to cool the body down? What mechanisms are there to warm the body up? Vasoconstriction-this is the opposite of vasodilation The capillaries underneath your skin get constricted shut off so less heat is lost Piloerection- this is when the hairs on your skin stand up The hairs trap a layer of air next to the skin which is then warmed by the body heat.

Heart rate The heart rate is controlled by the autonomic nervous system. This system however, is split into two, the sympathetic nervous system and the parasympathetic system.

There are many reasons why heart rate could increase; the main and obvious reasons are fear, stress and exercise. Exercise 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. Oxygen is only carried in the blood and the main organ for the blood pumping around the body is the heart.

This is when the sympathetic nervous system comes in; the receptors tell the brain that we are doing exercise and then the brains sends a message to the heart to pump faster, in order for more oxygen to be transported in the blood to the working muscles. The brain and nervous system both play a major role in controlling homeostasis mechanisms.

This is due to the fact that both help the body to anticipate when key variables might rise or fall beyond the accepted range and send signals to the effectors to reverse the change and re-establish the original state. Homeostasis and heart rate Homeostasis is responsible for managing the heart rate. This is controlled by the autonomic nervous system which as two branches, namely the sympathetic nervous and the parasympathetic nervous system.

Both these systems are responsible for managing the heart rate. The sympathetic nervous system is active when the body is undergoing muscular work, fear or stress. It causes each heartbeat to increase in strength as well causing an increase in heart rate.

The sympathetic nervous system is boosted by the hormone adrenaline during periods of fright, flight and fight. Its nerves are the cardiac nerves. During exercise, a change in sympathetic activity is the predominant mechanism by which speeding and slowing of the heart is achieved. The parasympathetic nervous system calms the heart output and is active during resting, peace and contentment. The Parasympathetic functions in opposition to the Sympathetic nervous system.

When the sympathetic system activates in response to some sort of stressor, the parasympathetic reacts in turn to bring the body back to a state of equilibrium. The main parasympathetic nerve is the vagus nerve and if this is severed the heart beats faster. During exercise the parasympathetic activity decreases as the increase in heart rate during exercise is triggered by the sympathetic nervous system.

Both branches of the autonomic nervous system interrelate with each other through the pacemaker S-A-node. This is a cluster of cells in the right atrium that regulate the heart to suite the circumstances. The cardiac Centre is found in the brain and is responsible for controlling the impulses of the SA Node; this means that the cardiac Centre essentially controls the heart and the heart rate.

The Cardiac Centre controls the heart rate by detecting change in blood PH levels through the use of chemoreceptors, the Cardiac Centre also sends nerve impulses to the pace maker and vagus nerves to change the heart rate. During exercise hormones are secreted by the Adrenal gland therefore increasing the activity of the heart.

Both of which can have an influence on the heart rate. During exercise the body is deprived of oxygen therefore to absorb oxygen the chemoreceptors increase the rate of respiration.

As a result of this the heart rate increases as well. Homeostasis and body temperature. Thermoregulation is the term used to describe homeostasis and temperature regulation, which is governed by the hypothalamus gland within the brain, both the hypothalamus and receptors in the skin help monitor changes in external and internal temperature, activating the negative feedback system when temperatures exceed or fall beyond normal levels.

When this occurs, the effects of homeostasis and temperature control are visible and voluntary, mainly relating to consciously choosing to take off clothing or putting more on to become cooler or warmer.

In response to hotter conditions, the body may also react by producing sweat, which serves as a bodily cooling system.

Thermoregulation during exercise will try to prevent heat from entering the body; this is done by the hairs on the skin lying flat, preventing heat from being trapped by the layer of still air between the hairs. This is caused by tiny muscles under the surface of the skin called arrector pili muscles relaxing so that their attached hair follicles are not erect. With homeostasis and temperature control in regards to cooler temperatures, the body may start shivering to generate heat through increased activity in the muscles.

The adrenal and thyroid glands may produce chemicals and hormones, such as adrenaline and thyroxine to help generate internal heat. Heat is generated from a variety of sources. The majority of heat we get is from metabolic processes such as catabolism where energy is transformed during the breakdown of large molecules. These reactions take place across the body and thus are a massive generator of heat. However it is important to understand that excess exposure to the sun is not good for your health.

When you exercise, the rate at which your body makes energy rapidly increases. This is also known as the metabolic rate. Heat is produced during metabolism, so an increase in metabolic rate also increases heat production.

More heat production means a larger rise in body temperature during exercise. For example when we do vigorous exercise our body breaks down muscles fibres and catabolism causes them to rebuild again causing our body temperature to rise due to the heat being generated from the reaction. The skin also has an effect on temperature; functions of the skin include waterproofing the body, protecting the body against radiation and Protecting tissues from friction damage.

The skin can help the body lose heat in a number of different ways: To meet this, the respiratory system responds by changes in breathing rate. The body receives oxygen from the lungs and transmits it to your muscles through your bloodstream.

The heart controls the flow of blood throughout the body and your heart rate is a factor of that flow. During exercise your body prefers to maintain your blood glucose levels by several different actions rather than use it for energy. Actions such as increased levels of epinephrine, glucagon and cortisol that get released in your body during exercise act to maintain your blood glucose levels through special pathways in the liver and also encourage your muscles to use more glucose which is good because you can keep working out!

Some of the key factors that dictate if your blood sugars will crash or not include:. The timing of your last meal before your workout when. The composition of your last meal before your workout what. How your body responded to food you ate before your workout how. When and what you ate in the hours following your last workout. This results in a major drop in exercise performance.

If somebody remains in the cold temperatures for a long period of time, the thermostat homeostasis mechanisms may fail and you could develop hypothermia. Hypothermia is when your body temperature drops beyond below the standard temperature needed for your body to function accurately without any inner body catastrophes. When your body is put in a certain situation for too long your internal environment may begin to shut down, leaving your body vulnerable.

Unless immediate action is taken to bring the homeostasis back to normal you will die. The same thing would happen if your body was exposed to extreme heat for any long periods of time. For the metabolic system to continue to occur in the body cells need a constant supply of glucose. Glucose is a carbohydrate, and is the most important simple sugar in human metabolism. Blood sugar levels should be maintained at around 90mg of glucose per ml of blood.

If blood glucose levels rise, insulin is released into the blood. Insulin is one of many hormones that help the body turn the food we eat into energy.

Also, insulin helps us store energy that we can use later.


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Oct 20,  · Homeostasis Essay Words | 10 Pages Homeostasis Homeostasis is defined as the maintenance of a constant internal environment.

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Homeostasis essays The human body's ability to maintain a constant environment is essential to its survival. This capability is referred to as homeostasis. Homeostatic mechanisms keep the body near a set point, based on the sensitivity of central nervous system nuclei, which is an ideal value.

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The aim of this essay below is to explain homeostasis, the principles involves, the negative feedback, the control of the blood glucose level, the mechanism of temperature regulation and the structure of the kidney and the function and the . Strong Essays words | ( pages) | Preview What is Homeostasis? Glucose is a small, soluble molecule obtained from foods rich in carbohydrates and plant based foods that when consumed by the human body is carried in the blood plasma (receptors for insulin is embedded into the plasma).Once consumed the carbohydrates are carried .

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Homeostasis is the mechanism in our body that regulates and maintains a stable and constant environment. This enables our body to respond to changes in the environment around us as. The homeostatic mechanisms in our body, observe and monitor conditions and will then make a judgment whether to change the way the body functions is order . Free Essay: Elaine’s reaction to the high winds and extreme cold is because of her body maintaining homeostasis. Homeostasis is the ability of the human body.