TEMPERATURE REGULATION in the HUMAN BODY by Professor Fink

In this Video Lecture, Professor Fink describes the principles of Temperature Regulation. The 3 major sources of Heat in the body are identified (Cellular Respiration, Muscular Activity & Assimilation of Food), followed by the 3 major routes of Heat Loss (Radiative Heat Loss, Evaporative Heat Loss & Breathing). Professor Fink then describes 4 Homeostatic Reflexes that are activated to raise the Body Temperture, followed by 4 Homeostatic Reflexes that are activated to lower the Body Temperature. Reference is made to the Thermoregulatory Reflexc Center in the Hypothalamus, the Set-Point, cutaneous vasodilation & vasoconstriction, sweating, shivering, and hormonal changes associated with acclimatization.
Check-out professor fink's web-site or additional resources in Biology, Anatomy, Physiology & Pharmacology: www.professorfink.com
Down-loadable e-Books of the Lecture Outlines by Professor Fink can be purchased from the WLAC Bookstore at: wlac.redshelf....
“Hard Copy” Lecture Outlines can be purchased from the WLAC Bookstore at: onlinestore.wla...

[@snekjuce]

the man, the legend, the prodigy best known as, The Professor.

[@SharpSapphire]

Best teacher I’ve ever come across

[@colinkraus7139]

i cant imagine having that projector shine me in the eyes like that! great video, thank you.

[@sandyable]

extremally thankful for your videos!!!

[@drrozyjan1010]

I always loved ur vedios ,,lots of thanks from indian occupied kashmir

[@kanimhamad-d6l]

hey professor i will be a medical student this year and i have been watching your videos they are fantastic....please do you have a free pdf link of these lectures?.... i will appreciate your help sir

[@khalidsaud2792]

Please doctor in hypothermia which branch of autonomic nervous system is stimulated? And what is do to blood vessels and sweat glands???

[@vanhooligan7532]

Great source of information. Since moving down to New Orleans, I struggle in the high humidity. My heart pounds, my skin is flushed and my hands swell up every time I go outside. Now I believe it's because I don't sweat. My body is having trouble with heat loss I guess. What controls sweating?

[@d.d.3935]

Your sympathetic nervous system via postganglionic fibers that release acetylcholine, that works on muscarinic ACh rezeptors of your sweatglands -> this triggers your sweat production

[@deenurajan1000]

Sir i want the clear notes of what you take a seminar ..plz sir

[@Sam_1964]

Thank you

[@manasikhokrale]

Hello sir,Can you please explain if temperature regulation is a negative feedback mechanism or is it a feedforward mechanism..confused a lot

[@professorfink]

Temperature Regulation is a "classic" example of "Negative Feedback" Control.

[@manasikhokrale]

Thank you sir!

[@luzrobinson1888]

If my room is cold because is not heated and my temperature is 35.7 what can you say about this

[@codyrountree1667]

Hey Dr fink! When you talk about acclimatization. In theory would working out in the cold make you lose any significant more weight? People always like to train when its hot for this effect, but the increase in thyroxin and epinepherine make me think the opposite. Further I am in nursing school. Im trying to wrap my mind around how vital signs are effected in hypothermic conditions. They say all your vital signs go down. I would think because of the vasoconstriction BP would be higher, Heart rate would be faster, and Lungs would be slower to generate the most heat. they actually say your meabolic rate decreases because you move less.....What i am thinking is it all depends on the degree of your temp. Sorry i know this is a potentially long answer but i really appreciate how you explain things. You should make textbooks! People would be so much smarter if they were written in a spoken word type of format.

[@professorfink]

While training in a colder climate would increase thyroxin & adrenalin levels, you would only lose weight if you refrain from eating more food. The most common thing that atheletes do related to acclimatization is to train at higher altitudes (such Denver, Colorado). Because of the "thinner" air, the body acclimatizes by increasing production of Red Blood Cells. When the athlete then competes at lower altitudes, they will have the benefit of increased Oxygen Carrying Capacity .

[@samosdolphins123]

Professor I really thank you and other professors who have posted on KZbin to teach people physiology and other subjects. Cody Rountree, If I may attempt to answer ? You are right, vitals would be critical during hypothermia and I think the answer is this: hypothermia is a state where the body temperature has become the same as the external environment in other words below normal and therefore not healthy temperature for normal cell function. Our body has thrown the book at the problem of trying to warm up but there comes a point where mathematically and physically there is no more heat left in the body and so it reaches a critical point. once cell function has slowed down vitals then go down because even the hypothalamus has stopped working right? What do you think?

[@musamanneh6504]

Could you please tell me the name of the book that you were talking about?

[@professorfink]

+Musa Manneh The textbook commonly cited is Tortora's Human Anatomy & Physiology. A major source that I have relied upon for my lectures is Vander's Human Physiology; The Mechanisms of Body Function (McGraw Hill Pub). The "Lecture Outline" pages that are shown are from a book that I made. Down-loadable e-Books of the Lecture Outlines by Professor Fink can be purchased from the WLAC Bookstore at: wlac.redshelf.com/ “Hard Copy” Lecture Outlines can be purchased from the WLAC Bookstore at: onlinestore.wlac.edu/fink.asp

[@musamanneh6504]

Thank you prof.

[@keziahgift471]

Wow u the best!

[@ReparentingDiary]

Great video Professor Fink! One question though, as far as I know, the nervous and endocrine systems acting together to maintain homeostasis. But is it true that homeostasis always involves the interaction between these two systems? It seems to me that regulating blood CO2 level and maintaining a normal body temperature do not require hormones... Thank you!

[@professorfink]

In classical physiology, the 2 principle systems that control & regulate ALL the other systems are the Nervous System (to a greater degree) and the Endocrine. (to a lesser degree). Thermoregulation is controlled by the Nervous System. The Blood sugar level is (mostly) controlled by the Endocrine System. The Regulation of Tonicity of Body Fluids involves an interaction of both the Nervous System and the release of a hormone (ADH).

[@ReparentingDiary]

professorfink Thank you for the detailed explanation! It all makes sense now.

[@johnstark1474]

While the information on physiological responses was quite valuable, you have misrepresented the fundamental heat transfer phenomena quite a few times. Radiative heat loss is not to the air itself, but rather an electromagnetic dissipation of heat "light" (in the IR spectrum). This phenomena is why you can feel the heat of a fire in a fireplace, even if the energy in the air itself is carried up the chimney. Also, humans can still dissipate heat in an environment over 100F, as the evaporation that results from perspiration will allow the local temperature to go below that of the ambient environment. As you note around 14min in, it takes a great deal of energy to more liquid water (1000 kg/m^3) to vapor (~1 kg/m^3), and this can drop the local temperature all the way down to the "dew point", which is below ambient temperature (so long as you are below 100% relative humidity). This same energy goes to creating vapor in your exhalation, which accounts for the majority of energy lost through respiration undermost conditions. I appreciate the great physiological background, but I hope you can include the appropriate definitions of the heat transfer phenomena in future lectures to ensure your student aren't misled.

[@professorfink]

Thank you for your clarifications and suggestions. Most students have not had a course in Physics, so simplification is necessary. With respect to Radiative Heat Loss, electromagnetic waves ARE created between the human body and the surrounding environment. With respect to Evaporative Heat Loss, as I indicated in the Video, it is limited in effectiveness not by ambient temperature but by relative humidity. All of these topics can be considered in much greater detail in a Physics course.

[@ohenekwekuabeka8136]

Please i don't understand the radiative heat loss with respect to the fire example.can you please explain further?

[@mehdinajafi5361]

How can i get access to the animation you show? Thank you.

[@professorfink]

+Mehdi Najafi The animation is linked on my web-site: www.professorfink.com

[@thelowkeytalkative4111]

Did you see that? "We open up our Physiology book... And we start sleeping" LOL.

[@TheOlzee]

Didn't mention the use of conscious control over body temp.

[@loopyctv]

‘Anaesthesia, Amnesi Death-or more precisely, our own death-falls outside the scope of our experience and as such remains unknowable. We can only confirm our intuition that we are alive ‘for ourselves’ through the lived experience of our existence. And the one thing that allows us to establish this sense of ourselves as living beings is the fact of our boundedness. None of the many attempts to establish in generic terms what it is to be alive are ever wholly satisfactory. Reproduction, homeostasis, and self-preservation are commonly cited as invariant properties of living organisms, but these functions only make sense in terms of the interiority of an organism. The integrity of a living being immediately implies its circumscription in space. For no organism can sustain itself without a boundary that gives it a form and allows it to interface with the world outside of it. This boundary, this spatial limit, is something I simultaneously incarnate and grasp through my body; it is effectively all that I am. But this bodily limit is also something I must consign to secrecy each time it reveals itself, plunging it over and over again into obscurity so that a dream of my infinite existence can be perpetuated and expanded. Nevertheless, at some point I must reconcile myself to the fact that the first thing I am conscious of, as a living being, is the fact that I have limits. The limit of the surface of a skin that brings me pleasure and pain; the limits of my growth, my flexibility, my reach; the limits of my strength, my abilities, and my energy; the limits of my senses.’

[@pellagirl1]

Adrenaline is released when body temperature is low, or blood volume is reduced eg. in shock This causes peripheral vasoconstriction to maintain blood flow to vital organs and muscles. But adrenaline also triggers sweating, and sweat glands are controlled by the sympathetic nervous system. This seems counterproductive.

[@robpetherick3702]

Adrenaline is released slowly when body temperature is a little low rather than dumping a load into the body at once. Shock is not a state the body wants to be in, it doesn't put itself into shock in order to warm up, its more to prevent massive blood loss, shutting down the flow to much of the body. I don't believe adrenaline is released during shock, surely the body wants to slow down metabolism and preserve everything.

[@cu99460]

Why dont you cover NCLEX professor? I think you should think about including NCLEX in your lectures.