Human Physiology Chapter 3 Flashcards
What are the different organizations of the CNS?
Brain and spinal cord.
What are the different subdivisions of the PNS?
The afferent division and efferent division. The efferent nervous system is further subdivided into the somatic and autonomic nervous system. The somatic nervous system comprises motor neurons that innervate skeletal muscle. The autonomic nervous system is further subdivided into the sympathetic system and parasympathetic.
What is the peripheral nervous system?
Consists of nerve fibres that carry information between the CNS and other parts of the body (periphery).
What is the afferent division?
The afferent division carries information to the CNS, informing it of changes in the external and internal environments.
What is the efferent division?
Instructions from the CNS are communicated via the efferent division to the effector organs.
What is the somatic nervous system?
Consists of the nerve fibres of the motor neurons that supply the skeletal muscles.
What is the autonomic nervous system?
Consists of nerve fibres that innervate smooth muscle, cardiac muscle and glands.
What do the sympathetic and parasympathetic nervous systems innervate?
Both innervate most of the organs supplied by the autonomic system.
What are the three functional classes of neurons?
Afferent neurons, efferent neurons, interneurons.
What is the sensory receptor?
At the peripheral ending of a typical afferent neuron is a sensory receptor that generates action potentials in response to a particular type of stimulus.
Where is the afferent neuron cell body located?
Adjacent to the spinal cord
What is the afferent neuron cell body devoid of?
devoid of dendrites and presynaptic inputs.
