B10.1 - Principles Of Homeostasis (Finished) Flashcards
What is homeostasis ?
The regulation of the internal conditions of a cell or organism to maintain optimum conditions for function, in response to internal or external changes
What does homeostasis respond to?
Internal or external changes
Give two/three examples of the conditions inside the body that need to be controlled
- Body temperature
- Water content
- Blood glucose concentration
What two types of responses can control systems have?
Nervous or chemical
What are the three key functions of a control system?
Receptors, control centres, effectors
What are receptors in a control system?
Receptors are cells that detect changes in the internal or external environment (stimuli)
What are stimuli?
Stimuli are changes to the internal/external environment
What do control centres do
Control centres receive and process information from receptors and send out signals to coordinate a response of the body
What are effectors in the control system?
Effectors are Muscles/glands that bring about responses to stimuli
Why is homeostasis needed for keeping the right conditions for enzymes?
Enzymes control all the functions of a cell, and the functioning of individual cells is vital to keep the tissues, organs etc working. Enzymes need a specific temp and pH so this needs to be controlled by homeostasis
What do automatic control systems do?
Automatic control systems detect changes and respond to them to regulate the internal environment
