Homeostasis P1 Flashcards
What does homeostasis do?
Maintains optimal conditions for enzyme action and cell functions
What does homeostasis control?
Blood glucose concentration, body temperature and water levels
What is involved in the nervous system?
The brain and spinal cord
What is the peripheral nervous system?
Nerves that carry information to or from the central nervous system
Define homeostasis
Maintenance of a constant internal environment in the body
What do receptors do?
Detect changes in the environment
What is the coordination centre?
Things like the brain which processes information from receptors around the body
What are effectors?
Muscles or glands which the coordinator generates a response in
What is a negative feedback loop?
Process where optimum levels are restored
What is the optimum body temp?
37°C
What do all control systems include?
Cells called receptors, the coordination Centre and effectors
What are some examples of coordination centres?
The brain, spinal cord or pancreas
What are nerve cells called?
Neurons
What are nerve cells adapted to do?
Carry electrical impulses
What is a bundle of neurones called?
A nerve
What are the three main types of neuron?
Sensory motor and relay
What are the common features of the three main types of neuron?
Along fibre called an axon and tiny branches called dendrons
Given the function of the axon and how’s it adapted to this
It is insulated by a fatty (myelin) sheath to curry messages
What are the functions of dendrons and how are they adapted for this
They branch further as across at the end and they receive incoming impulses from other neurons
Nervous system response order
Receptor, sensory neurons, CNS and relay neurones, motor neurones and effectors
Sense organs
Skin, tongue, nose, eye and ear
