Whole content Flashcards
Define Homeostasis
Maintaining a constant internal envionmeny despite external changes
Why is homeostasis important?
Maintains optimum conditions for enzymes and cell functions
List 3 things we need to control in the body
Blood glucose concentration
Body temperature
Water levels
What will a control system in the body always have?
A receptor
A co-ordination centre
An effector
Define receptor
A cell that detects stimuli (a change in the envionment)
List 3 co-ordination centres
Brain
Spinal cord
Pancreas
Define effector
A muscle or gland that brings about a response back to optimum
What is a cell fhat electrical impulses pass along called?
Neurones
List the order of the reflex arc
Stimulus Receptor Sensory Relay Motor Effector
What are examples of effectors and what do they do?
Muscles (which contract)
Glands (secrete substances)
What does the CNS do?
Control the response of the effectors
What does CNS stand for, what is it made up of?
Central Nervous System
Made up of the Brain and Spinal cord
Why are reflex actions important?
They enable survival
Why are reflex actions said to be automatic and rapid?
Do not go to/involve the conscious part if your brain
What is the endocrine system?
Composed of glands which secrete hormones directly into the bloodstream