Summary
Summary H74 - SV Guyton and Hall
- Course
- Institution
- Book
Samenvatting H74 van Guyton and Hall's Textbook of Medical Physiology.
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
Test Bank for Guyton and Hall Textbook of Medical Physiology (Guyton Physiology) 13th Edition by John E. Hall Chapter 1-85
-
Test Bank in Conjunction with Guyton and Hall Textbook of Medical Physiology,Hall,13e
-
Summary of reabsorption in renal tubules
Seller
Follow
CarmenHorenberg
Reviews received
Content preview
Guyton and HallCHAPTER 74 – Body Temperature Regulation and Fever
Different factors determine the rate of heat production (the metabolic rate of the body):
1) The basal rate of metabolism of all cells of the body
2) Extra rate of metabolism caused by muscle activity, including muscle contractions
caused by shivering
3) Extra metabolism caused by the effect of thyroxine on the cells
4) Extra metabolism caused by the effect of epinephrine, norepinephrine, and
sympathetic stimulation on the cells
5) Extra metabolism caused by increased chemical activity in the cells, especially when
the cell temperature increases
6) Extra metabolism needed for digestion, absorption, and storage of food
The rate at which heat is lost is determined almost entirely by 2 factors:
1) How rapidly heat can be conducted from where it is produced in the body core to the
skin
2) How rapidly heat can then be transferred from the skin to the surroundings
Skin, subcutaneous tissues and fat of these tissues act together as a heat insulator for the
body fat conducts heat only 1/3 as readily as other tissues.
The insulation beneath the skin is an effective means of maintaining normal internal core
temperature.
Vasodilation occurs when heat needs to be conducted from the core of the body to the skin
for heat loss.
Vasoconstriction occurs when there is need for decrease of heat conduction from the core
to the skin hold onto heat.
Vasoconstriction is controlled by the sympathetic nervous system in response to
changes in body core temperature and changes in environmental temperature.
There are various methods by which heat is lost from the skin:
Radiation: causes heat loss in the form of infrared rays radiation in all directions
If the temperature of the body is greater than the temperature of the
surroundings, a greater quantity of heat is radiated from the body than is
radiated to the body.
Conduction: heat loss due to direct contact with an object
o Conduction from body surface to solid objects
o Conduction from body surface to air
Convection: the heat from the skin is first conducted to the air and then carried away
by the convection of air currents
Evaporation: in normal situations; from skin and lungs / when the temperature of the
surroundings becomes greater than that of the sin, instead of losing heat, the body
gains heat by both radiation and conduction sweating
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller CarmenHorenberg. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.35. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
83430 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now