B10 - The Human Nervous System Flashcards
what are homeostatis
the regulation of the conditions inside your body and cells to maintain internal enviroment
why are homeostatis important in the body
because the internal conditions in the body need to be carefully controlled to maintain the optinum enviroment for enzymes and cell fucntions
what are the internal conditions in homeostatins
- body temperature
- blood glucose level
- water content
these are regulates by nervous and hormonal control systems
what does a control system include
- receptors (detects stimuli)
- coordination centre (brain, spinal chord or pancreas, that recieves and processes information from receptors and organises a responce)
- effectors (muslce, glands, produce a responce to restore the system back to its normal level)
what does the nervous system allow humans to do
allows humans to respond to changes in the enviroment (stimuli) and coordinate behavior
how does information travel in the nervous system
- information from receptors travels as electrical impulses via neurons to the central nervous system (CNS - consists of brain and spinal chord where response is coordinated)
how do the muscles respond to impulses
the muscles contract and the gland secrete hormones
how is the nervous system adapted to its function
what are the connections between neurons called
synapses - a nerve impulse is transfered across a synapse by chemicals that diffuse across the gap
what do reflexes do
- very fast
- automatic responses to a stimulus
- reduce chance of being injured
what is in a simple reflex
- stimuli are detected by receptors and transmitted to the CNS as nervous impulses via sensory neurons
- the impulses are transfered via relay neurons in the CNS to a motor neurone, which sends impulses to effectors
- the effector then produces the responce
what are some examples of comon reflexes
- pupil reflex
- knee jerk
brain is not a reflex
required practicsl reaction time
caffiene and ruler
