Homeostasis Flashcards
name the 4 main tissues in the human body
Muscle
Nervous
Epithelial
Connective
define the term “Homestasis”
The ability of the body to maintain a stable internal environment despite external changes. This dynamic equilibrium is essential for optimal cell and organ function
name the 7 factors which are homostatcally regulated
conc of nutrient molecules
con of O2 and C02
conc of waste product
pH
conc of water, salt and electrolytes
temperature
volume and pressure
define intracellular fluid
fluid contained within ALL of the cells of the body
define extracellular fluid
fluid OUTSIDE the cells of the body and is the internal environment in which the cells live
what is the extracellular fluid composed of
plasma and intersticial fluid
define the term intrinsic
inherent compensatory response of an organ to a change
define the term extrinsic
response of an organ triggered by factors external to organ (by endocrine glands or nervous system)
explain the Negative feedback mechanism and how it contributes to maintaining homeostasis
1.change in homestatically controll factor triggers a response
2.this seeks to restore factor to normal by moving factor in the opposite direction of its initial change
3.is a pathway where respond opposes OR removes signal
SENSOR-detects change in the internal
Environment
CONTROL CENTRE-receives information from the sensor and compares it to the set point
Effector-produces a response to restore the set point
explain the positive feedback mechanism
1.the output is continuously enhanced or amplified
2.this is so the controll variable continues to be moved in the direction of the initial change
3.the pathway in which the initial response reinforces the stimulus
explain the feedforward mechanism
brings about a compensatory response in anticipation of a change in a regulated variable
Describe a positive feedback mechanism
Child Birth is an example of positive feedback
1.onset of labour
2.oxytocin released from hypothalmus
3.increased uterine contraction
4.babys head pushed through cervix
5.stretch of cervix
6.more oxytocin released
7.increased uterine contraction
