Homeostasis Flashcards
What is homeostasis
The maintenance of internal constant environment
Structure of the skin
Nerve endings
Blood capillaries
Sweat gland
Sweat pore
Hair shaft
Hair follicle
Hair erector muscle
All the above is in the epidermis
Then dermis
The adipose tissue
Sweat gland on a hot day
Blood capillaries becomes wide therefore more worm blood flows near the skin surface and more heat is lost through radiation
Blood capillaries on a cold day
Blood capillaries shrink hence less blood flows near the skin surface thus preventing heat loss through radiation. This results in more heat being retained
Sweat gland on a hot day
Sweat gland produce sweat , the sweat carries away heat as it evaporates and the body temperature goes back to normal
Sweat gland on a cold day
Production of sweat stops reducing heat loss
Hair shaft on a hot day
The hair erector muscle relaxes and the hair lies flat on the so that there is no layer of air trapped that may prevent heat loss from the body
Hair erector muscle on a cold day
The hair erector muscle contract and the hairs becomes erector and trap a thin layer of air that acts as an insulator. As a result, less heat is lost from the body
Shivering
Involuntary rapid contraction muscles when it is cold.
When muscles contract rapidly they generate heat hence production of hear increases
Regulation of Glucose by the liver
When blood glucose rises above normal the brain detects the increase of glucose and sends a message to the pancreas to produce insulin which will trigger the liver cells to convert excess glucose to glycogen
When the glucose level drops below normal
The brain detects the decrease I’m glucose and sends a message to the pancreas to produce glucagon which will trigger the liver cells to convert glycogen back to glucose
