the nervous system Flashcards
the nervous system
specialised network of cells
central nervous system and peripheral nervous system
communicates using electrical signals
collect, process and respond to information
co-ordinate the working of different organs and cells
central nervous system
consists of brain and spinal cord
origin of all complex commands and decisions
peripheral nervous system
sends information to the CNS from outside world and transmits messages from CNS to muscles and glands
somatic nervous system
transmits information from receptor cells in the sense organs to the CNS
receives information from the CNS that directs muscles to act
autonomic nervous system
contains sympathetic and parasyhmpathetic
transmits information to and from internal bodily organs
endocrine system
body’s major information systems that instructs glads to release hormones directly into the bloodstream
hormones carries towards target organs in the body
glads
an organ in the body that synthesises substances such as hormones
eg pituitary, thyroid, adrenals
hormones
chemical substances that circulate in the bloodstream and only affect target organs
produced in large quantities but disappear quickly
