Homeostasis - AnP12

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)