thermogenisesis Flashcards
most of the heat in the body is generated how
by deep organs such as liver, brain, heart, GI and skeletal muscle
the rate of heat loss I dependent on what
body composition :more fat is a good insulator and prevent heat loss, people with low BMI will loose more heat
environmental temperature: colder environment = body loose heat, higher temperature = body gain heat
what is the maximum heat can the body absorb before it become fatal
50º
which one before heat or cold receptor that is ten time more present
cold
what does hot receptor produce if the temperature is too hot
activation potential
what does cold receptor produce if the temperature is too cold
action potential
T/F receptor are found superficialy on the skin and on deep body organ
t
what happen when the receptor produce an AP
it sends a message back to the hypothalamus. The hypothalamus controls temperature, it has temperature regulation centers connected to the hot and cold sensor neurons. The hypothalamus has a ‘set point’, this is the desired body temperature of 37°C.
what happen with the hypothalamus if the body becomes too cold or too hot
the hypothalamus will raise the set point, which tells the body to conserve heat and produce more heat.
the hypothalamus will raise the set point, which tells the body to loose heat and produce less heat.
to make temperature change the hypothalamus need to regulate what
peripheral vasoconstriction, peripheral vasodilation, shivering, brown adipose tissue, metabolic rate and sweating.
T/F thermoregulation has passive and active process to loose or gain heat
true
how does passive heat transfer occurs
by radiation, conduction, convection.
how does radiation occurs
Radiation is not nuclear! It is infrared radiation is emitted form the skin. Here is an infrared camera picture of the academic advisor.
how does conduction occurs
Conduction is when your body heats up surrounding air or water, or objects like seat you are sitting in.
how does convection occurs
Convection is when your body heats up air, and air is taken away by a breeze.
the body can actively loose heat by what
evaporation
what is evaporation
. Evaporation is panting, or sweating.
how can heat can be done passively
Adenosine triphosphate (ATP) is loaded with energy, up to 12,000 calories can be released. Thus, heat can be generated based on control of the chemical reaction rate of cells.
The digestion of food also releases heat
Exercise causes heat as a byproduct, normal muscle contractions when rapid can release energy from 150 times the amount of ATP than a resting muscle. Energy production is inefficient and so heat is released.
how does the body actively generate heat
Shivering thermogenesis ,Non-shivering thermogenesi
what is shivering thermogenesis
Cold environment or illness (e.g. flu) sympathetic nervous system causes muscles to tremor, the rapid contraction of muscle myosin proteins releases heat.The cold sensors will trigger this shivering response, and well as prevent sweating by sending signals to the hypothalamus.
what is non shivering thermogenesis
The sympathetic nervous system and the hormones including catecholamine hormones epinephrine, norepinephrine, and triiodothyronine, thyroxine, and others, increase metabolic rate of body resulting in more heat being generated. Brown adipose tissue is an endocrine tissue that specializes in non-shovering thermogenesis.
which tissue regulate non-shivering thermogenesis
brown dispose tissue
is the amount of heat made by BAT significant for overall body heat
no
is BAT considerer an endocrine gland
no
