Homeostasis
process by which organisms maintain a relatively stable internal environment
Dynamic Equilibrium
homeostatic levels are NOT ALWAYS constant, but can fluctuate and then are brought back within a normal range.
endocrine system
The body system that involving glands that secrete hormones to regulate body processes such as growth, reproduction, and metabolism.
Thermoregulation
Process of maintaining an internal temperature within a tolerable range. Homestatic body temp is 37 degrees
Negative feedback control
the body counteracts a stimulus to try to bring the body back within a normal range
Positive feedback control
a stimulus causes a change and then the body reacts to ampify this change, a reaction in intensified (ex: childbirth)
Stimulus
a signal to which an organism responds
nervous system
the body's speedy, electrochemical communication network, consisting of all the nerve cells of the peripheral and central nervous systems
pH of the blood
Homestatic pH level in the blood should be 7.4
Blood Gluose Regulation
insulin (a hormone) and negative feedback
Urine formation in homeostasis
Urine formation helps regulate blood volume, salt balance and pH
Pancreas in homeostasis
Detects blood glucose levels to release insulin when needed or stimulate formation of glycogen by the liver
Gycogen
is the storage form of glucose, when blood glucose levels are high the liver stores glycogen
Role of respiratory system in homeostasis
Regulates blood pH by removing CO2 which prevents acidosis
Blood Pressure
120/80 mm Hg
Blood Sugar
70-100 mg/dL glucose
Effector
an organ or cell that acts in response to a stimulus.
Control Centre of the body
The brain
vasoconstriction
blood vessels get more narrow to prevent the loss of heat (to maintain homeostasis)
vasodilation
widening of blood vessels, allows more blood flow & can be useful to transport heat away from the core (to maintain homeostasis)