Homeostasis ; Negative feedback A2/A level Biology
- Created by: evaabarry
- Created on: 01-03-22 17:25
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- Homeostasis: Negative feedback
- Homeostasis : Maintenance of a relatively constant internal environment in the body
- Mammals control : - Internal temperature - glucose concentration. - water potential - hormones & proteins - osmotic pressure
- This is done using negative feedback
- Negative Feedback : Mechanism by which a change in a particular factor brings about an action that reverses the change. > Constantly checks if balance is restored. >When restored; effector switches off
- NF involves : 1.) INPUT: Notices a change to the system 2.) RECEPTOR: measures the level of the variable( the change) 3.) CO-ORDINATOR: >Sets level operation > receives info from receptor > compares info with normal body values- "Set data". > commands effector
- 4.) EFFECTOR: Brings second change to the system , opposite from the hormone. 5.) OUTPUT: Occurs when balance is restored
- NF involves : 1.) INPUT: Notices a change to the system 2.) RECEPTOR: measures the level of the variable( the change) 3.) CO-ORDINATOR: >Sets level operation > receives info from receptor > compares info with normal body values- "Set data". > commands effector
- Regulators: >They constantly adjust to their internal environment in response to the external environment ( e.g mammals and birds) > They have more freedom choosing the environment they live in
- Non- Regulators : Not able to adjust their internal environment , theres a limited choice of where they can live (E.g, jellyfish)
- Co-ordination systems involved : 1. NERVOUS SYSTEM - made up of brain, spinal cords , nerves. All contain neurones. Info passed along in form of electrical impulses rapidly
- 2. ENDOCRINE SYSTEM: Made up of number of endocrine glands which secrete hormones into blood. Info transferred as hormones are distributed around body in blood
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