unit 1 AOS 1- nervous system Flashcards
The nervous system works in 3 ways:
receive sensory information from external and internal environment
Processes and transmits info around the body
Organsises a co-ordinated response to information
central nervous system
The central nervous system is comprised of the spinal cord and brain. Its main role is to process information and co-ordinate a response
the brain:
organises, interprets and integrates information. It regulates and guides aloo other parts of the nervous system
the spinal cord:
a delicate cable of nerve fibres that convey messages from the brain to the PNS and the PNS to the brain
The Peripheral nervous system
is the complete network of neurons located outside of the CNS comprising of muscles, glands and organs. It carries sensory information from sensory organs to the CNS and conveys information from the CNS to the muscles, glands and organs.
the somatic nervous system:
senses external stimuli and coordinates voluntary response it involves receiving sensory stimuli and relaying that to the CNS. It also controls the skeletal muscles attached to bones enabling voluntary movement eg. Walking and talking
how does the messages travel ( what track)
Sensory info — sensory neuron(afferent) — CNS
CNS — motor neuron(efferent)— voluntary movement
autonomic nervous system
autonomic nervous system: its main role is to control involuntary body functions that help to keep us alive eg. Heart rate, respiration ect. To is the division which controls the activity level of our internal organs and glands. If is self regulating and functions automatically
the sympathetic nervous system
is a branch of the ANS that alters activity levels of internal muscles, organs and glands to physically prepare out bodies for high times of stress, emotions or physical arousal. It controls our arousal. It acts like our bodies emergency system which is known as flight, fright, or freeze.
the parasympathetic nervous system:
calms and relaxes the body once the threat/ stressor has passed. It maintains homeostasis and keeps our internal systems balanced and in a healthy state.
