Nervous System Flashcards
What is response to change?
Adjustments made by electrochemical
messages to & from the brain or by hormones
The central Nervous system…
Has the nerves of the brain and spinal cord
The Peripheral Nervous System…
has the nerves between the organs and the CNS and includes somatic & autonomic nerves.
The somatic nervous system controls…
skeletal muscle, bones & skin
The Autonomic Nervous System…
Controls internal organs and Includes sympathetic &
parasympathetic nervous system
What are neurons?
The functional units of the nervous system and include sensory, inter and motor neurons
What are Glial cells?
non-conducting cells that are involved with structural support and the metabolism of neurons
What are dendrites?
They recive information and carry impulses toward the cell body
What are axons?
they send impulses away from the cell body and towards other neurons and/or effectors
What are Myelin Sheaths?
they surround and protect axons and are formed by Schwann/Glial cells
What are Nodes of Ranvier?
they are the spaces between the myelin sheaths. and the nerve impulses “jump” from node to node to speed up rate of transmission
What are Sensory (afferent) neurons?
They sense and relay info (stiumili) from the environment to the CNS
What are Motor (efferent) neurons?
they bring information to the effectors (muscles, glands, organs)
What are interneurons (Association Neurons)?
Located in the brain and spinal cord. They coordinate and explain the sensory stimuli and they connect the sensory and motor neurons
What is neurilemma?
A thin membrane that surrounds some axons and promotes the regeneration of dammaged axons
