Homeostasis
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Name the three homeostatic control mechanisms and their role
1) Sensory receptor/monitor —> monitors body’s internal conditions (temp,blood, blood sugar, blood pressure, PH levels) 2) coordinating centre—> receives messages from the monitor and sends messages to the regulators 3)Regulator (or effector) causes the change in internal condition
body systems are mainted within very ______ limits
narrow
what is homeostasis often referred to as
dynamic equilibrium
What is the Negative feedback loop
process by which a mechanism is activated to restore conditions to their original or acceptable range prevents small changes from becoming to large
examples of regulating body temperature, explain
1) sensory receptors detect rise in internal temp 2) message is sent to coordinating centre 3)coordinating centre sends messages to regulators 4)Regulator responds (ex blood vessels dialate, or sweat) 5) once temp returns to normal, the response of regulator stops
positive feedback loop
process by which a a small effect is amplified; moving the controlled variable even further away from a steady state (less common in the body)
example of Positive feedback loop
1)Head pushes against cervix 2)Nerve impulses from cervix’s are transmitted to brain 3)Brain stimulates pituitary glands to separate oxytocin 4)oxytocin carried through bloodstream in uterus 5)oxytocin stimulates uterin contraction and pushes fetus towards cervix
define homeostasis
process by which a constant internal environment is maintained despite changes in the external environment
What would happen if we didnt have homeostais?
solve after the break