What regulates your body temperature?!
Question:
Answers:
Your brain cells
Other Answers:
Your Hypathalumus <---(sp) regulates your 98.6 degrees.
Maintaining body temperature
Question: What keeps the human body at a constant temperature of 98.6?
---Jeff
Answer: Maintaining body temperature is very complex. It also takes a lot of energy.
About 80% of the energy from the food you eat goes to maintaining body temperature.
Basically, the chemical reactions of metabolism of stored food, especially fats,
generate heat as a by product. This heat warms the body. The brain reads temperature
and controls to some extent the rate of this metabolism. There are also many other
mechanisms triggered by the brain to keep the core of your body warm, even if the
periphery (skin) is cold. Blood vessels to the fingers and toes constrict, so that
the cold air doesn't cool the blood too much, so that cooled blood doesn't cool down
the heart and brain when it returns. In severe cases, your body will sacrifice a
finger or a toe to keep you from dying of cold core temperature (frostbite: it saves
your life!). Also the brain can order a lot of muscles to contract rapidly. This
generates a lot of heat quickly, a response called shivering. There's much more to
this exciting field of research
Temperature is Controlled from Sites in the Hypothalamus
Temperature control requires sensors, a control center, effectors
Temperature sensor are found throughout the body: skin, body core, brain
Two types- respond to hot and cold
Control center is in the hypothalamus of the brain
Hypothalamus acts as a thermostat- has a temperature set point
Efffectors:
Produce more heat (increased metabolic rate, shivering, brown fat metabolism)
Change heat loss (blood vessel dilation or constriction, erection of hair, curling up, sweating)
Skin is the Primary Organ for Removal of Metabolic Heat
About 90% of body heat is lost through the skin
If body temperature is too high the skin can dilate blood vessels and increase blood flow by 150 times to loose excess heat
In cold weather skin will constrict blood vessels and release heat loss
Heat loss is by radiation, conduction, convection and sweating
Newton's law of cooling governs heat loss by radiation & conduction
Heat loss = (heat conductance)(temperature difference)
Temperature difference = (body temp - ambient temp)
Sweating can be used to lose enormous amounts of heat
Sweat glands originate in the dermis- ducts penetrate epidermis, releasing secretion on skin surface
Heat of vaporization of water is about 580 Calories/liter
If the ambient temperature is higher than the body temperature, sweating is the only way we can lose heat
Sweat glands are activated by nerves from the sympathetic nervous system-
Skin also contains muscles (arrector pili) which erect hair shafts (piloerection), increasing insulation- probably not too important in humans
Failure of Temperature Regulation on Hot Days Can Cause Heat Exhaustion and Heatstroke
You can lose as much as 1.5 liters of water per hour as sweat
If this water is not replaced blood pressure will fall and heat regulation will fail and body temperature will rise
This is heat exhaustion- skin will be wet and cool from sweating- treat by replacing water and salt that has been lost
Heat stroke is a failure of the sweating mechanism- skin will be dry and hot- very dangerous, treat by rapid cooling
Fever Occurs When the Temperature Set-Point is Raised
Fevers are caused by in increase in the temperature set point- the thermostat has been set higher
Caused by bacterial toxins
Fevers are probably beneficial in recovery from infections if they do not get too high
Fevers can be caused by increased metabolism, reduced heat conduction, or both
The graph below shows a Madonna computer simulation of temperature regulation
At 10 minutes the metabolic rate was increased 10% and the heat conductance was reduced 10%
Body temperature rises from 37 deg C (98.6 deg F) to 40.6 deg C (105 deg F) in about 1 hour
Bottom line: relatively small changes in metabolic rate
Source(s):
http://www.newton.dep.anl.gov/askasci/bio99/bio99317.htm
http://members.aol.com/Bio50/LecNotes/lecnot23.html
Your hypothalmus regulates your temp.
Hypothalamus
Hypothalamus
I INTRODUCTION
Hypothalamus, part of the brain, important in regulating the internal activities of the body. Although the hypothalamus constitutes less than 1 percent of the total volume of the brain, it has an important influence on many of the body's functions, including sexual behavior, emotions, hormone production, and the autonomic nervous system.
II ANATOMY
The human hypothalamus weighs about 4 g (0.14 oz) and is found behind the eyes, directly below the brain's thalamus and above the pituitary gland. The hypothalamus is divided into several distinct nuclei, that is, aggregates of nerve cell bodies. These nerves connect the brain with the hypothalamus and the hypothalamus to virtually all regions of the nervous system. The hypothalamus also receives nerve inputs from the erogenous zones (the genitalia and nipples), the viscera (internal organs), and the limbic system (concerned with motivation and drive).
III FUNCTION
The hypothalamus controls a wide range of functions. It directs the “fight or flight” response of the autonomic nervous system. Fear or excitement causes signals to travel to the hypothalamus, which triggers a rapid heartbeat, faster breathing, widening of the pupils, and increased blood flow. The hypothalamus monitors blood glucose levels and the body's water content to regulate appetite for food or drink. It regulates sleep and sexual behavior.
The hypothalamus plays an important role in regulating feeding behavior. Experiments performed on rats demonstrate that if the middle of the hypothalamus is damaged, the rat overeats and becomes obese; damage in the lower part causes the rat to refuse to eat and starve. The role of the human hypothalamus is less important than in rodents because conscious decisions play a greater part in human processes such as eating and drinking. For example, it has been shown that custom and habit have a greater influence over the amount eaten than actual hunger.
The hypothalamus has an effect on the cardiovascular system and the rest of the autonomic nervous system. This effect is vital for the coordination of mind and body; for example, it is responsible for the physical changes required before exercise.
The hypothalamus can be regarded as the thermostat controlling the temperature of the body. It initiates shivering and contraction or expansion of blood vessels. The hypothalamus triggers behaviors such as putting on or removing clothes, turning on the heat, or moving into the shade.
IV ENDOCRINE FUNCTIONS OF THE HYPOTHALAMUS
The hypothalamus is responsible for controlling the hormones released from the pituitary gland. Two of these hormones are oxytocin and vasopressin (also called antidiuretic hormone or ADH).
Oxytocin plays a role in uterine contractions during childbirth. It also has a role in starting and maintaining the birth process. Breastfeeding also triggers the secretion of oxytocin via a nervous pathway that connects the nipple and the hypothalamus; oxytocin stimulates the flow of milk from the breast to the infant. Oxytocin secretion can also be caused by the sound of a baby crying—an example of the connections the hypothalamus has with the other parts of the brain.
The hormone vasopressin acts on the kidneys to increase reabsorption of water from urine, thereby maintaining the water level within the body. When the hypothalamus senses that blood concentration has increased, it stimulates the pituitary gland to produce more vasopressin. Likewise, if blood concentration is too dilute, the hypothalamus instructs the pituitary gland to release less vasopressin.
A part of the hypothalamus is involved in the regulation of circadian rhythms in the body. These rhythms are caused by hormone fluctuations in the bloodstream that occur during each 24-hour period, usually correlating with periods of light and darkness. These fluctuations ensure that the appropriate hormones are elevated when most needed in the body. Cortisol hormone levels, for example, routinely rise in the morning just before waking. This increases blood glucose levels to counterbalance the potentially harmful effects of not eating or drinking while asleep overnight.
V HYPOTHALAMUS DISORDERS
Damage to the hypothalamus can result from surgery, trauma (such as accident or stroke), degeneration due to old age or disease, or a tumor. The results of damage can be varied and depend on the areas of the hypothalamus involved.
Diabetes insipidus can be caused by hypothalamic damage, or by damage to the hypothalamic-pituitary tract. This disease reduces vasopressin production, resulting in large volumes of urine being produced at all times.
Other hypothalamic disorders can include sexual abnormalities (such as premature puberty), psychic disturbances, obesity, anorexia, temperature regulation disorders, sleep disorders, and disruption of normal circadian rhythms.
Hypocampus and amygdala.
I think.
I think I am wrong.
Body temperature is regulated by the hypothalamus, a small but vital region of the brain situated below the two thalami and above the pituitary gland. http://www.nurseminerva.co.uk/body.htm
the air con!
pee is one of the things
Source(s):
personal ecoerance
Hey,
The temperature of the body is regulated by neural feedback mechanisms which operate primarily through the hypothalmus. The hypothalmus contains not only the control mechanisms, but also the key temperature sensors.
You should make your questions more specific to help people answer them.
Hope this helps =)
Source(s):
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/heatreg.html
your blood
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