Homeostasis Flashcards
What is homeostasis?
concept of maintaining a relatively stable internal environment according to external changes that we face.
internal environment is composed of _______?
interstitial fluid
Cell?
smallest unit of life
Metabolism
chemical reaction that happens within the cells
What is interstitial fluid?
from where the cells obtain the nutrients and in which the cells eliminate the waste
____% of interstitial fluid forms adult body weight?
16%
system that play the principal role in maintain the consistency of interstitial fluid?
Cardiovascular system
how does cardiovascular system maintain interstitial fluid consistency?
circulation of blood brings fresh materials to cells and remove the waste products from cells.
where does interstitial fluid if formed from and gets resorbed?
from the blood
Role of respiratory system related to blood?
brings oxygen to the blood and remove waste gas carbon dioxide from the blood
Role of digestive system related to blood?
brings nutrients to blood such as glucos
Role of urinary system related to blood?
remove waste (other than carbon dioxide) from the blood and eliminates them to the external environment.
what is controlled condition meanse?
variables that body regulates or balance are called…
name the controlled conditions are regulated by Homeostatic control mechanisms
temperature water balance electrolyte balance blood ph (level of acidity) blood glucose level blood pressure
what is homeostasis mechanism means?
it’s an internal communication between nervous system and endocrine system.
components of homeostasis mechanism.
Receptor
Control centre
Effectors
Receptors?
respond to a stimulus, that then causes a change in a controlled condition. this is sent to the control centre. so its an input for the control centre. (are in nerves)
Control centre
determine the appropriate output according to the input it receives (hypothalamus in brain)
Effectors
are the means in which the control centre regulates the controlled condition (nerves to muscle and glands)
What is negative feedback?
control centre wants to reverse the change in the controlled conditions. wants to bring the conditions back to normal stage.
What is positive feedback?
where the controlled condition increased or intensified until the end result is reached and the feedback loop is terminated.
example of negative and positive feedback
negative: body temperature is high so we sweat to cool the body temperature down.
positive: babies birth
what affects the persons controlled condition?
external and internal stimuli
Principle of feedback
Receptors respond to a stimulus, input to the control centre then output to the effectors.
what is stimuli?
anything that can change the controlled condition is called stimuli
Thermoreceptors
temperature
osmoreceptors
blood osmolarity
hypothalamus.
part of the brain where the control centre for temperature is located.
hypothermia
low temperature
hyperthermia
high temperature
