Homeostasis Flashcards
The ability of the body to maintain a relatively stable (physiologically) internal environment
Homeostasis
It is in a dynamic state of equilibrium and internal conditions vary, but within relatively narrow limits
Internal environment of the body
Variety of factors that act and interact in complex ways to maintain homeostasis
Chemical factors
Thermal factors
Neural factors
Components of homeostatic control mechanism
Variable
Receptor
Control Center
Effector
A factor or event being regulated
Variable
It monitors the environment and responds to changes (the stimuli)
Receptor
It is part of the sensory system and is connected to afferent nerves
Receptor
It determines the set point at which the variable is maintained
Control center
It provides the means to responds to the stimulus
Effector
It is innervated by efferent nerves coming from the brain
Effector
Two types of homeostatic control mechanism
Negative feedback system
Positive feedback system
Output turns down or shut off the original stimulus
Negative feedback system
Enzyme that will be activated in the liver, helping the liver take up excess glucose and store it as glycogen
Glycogen synthetase
Output enhances or turns up the original stimulus
Positive feedback system
Hormone that stimulate uterine contraction during labor
Oxytocin
Capability of maintaining its body temperature even if there’s other changes in the external temperature
Endotherm
Body temperature is almost close to their ambient temperature
Ectotherm
Ways of heat exchange between an organism and its environment
Radiation
Convection
Conduction
Evaporation
In aquatic thermoregulation the lowest body temperature is found in the?
Periphery
In aquatic thermoregulation the highest body temperature is found in the?
core, near the center
In aquatic thermoregulation the highest body temperature is found in the?
core, near the center
