The nervous system and the three divisions. Flashcards
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What does CNS stand for?
Central nervous system
What does PNS stand for?
Peripheral nervous system
What does ENS stand for?
Enteric nervous system
What does the CNS consist of?
The brain and spinal cord
What does PNS consist of?
All of the nervous tissue outside the CNS, except for ENS.
What are receptors?
Receptors are sensory structures that detect changes in the internal or external environment.
What do sensory receptors do?
Sensory receptors detect position, touch, pressure, pain and temperature change. Special sense organs are involved with smell, taste, sight, balance and hearing.
What is the first step that occurs when there is a change in the environment?
Receptors detect a change in the environment
What is the second step that occurs when there is a change in the environment?
The sensory (afferent) division of the PNS brings information to the CNS from receptors in peripheral tissues and organs.
What is the third step that occurs when there is a change in the environment?
Information processing- It integrates, processes and coordinates sensory input and motor commands.
What is the fourth step that occurs when there is a change in the environment?
The motor (efferent) division of the PNS carries motor commands from the CNS to peripheral tissues and systems. This includes the somatic nervous system (SNS) and the autonomic nervous system (ANS).
Describe the somatic nervous system (SNS)
The somatic nervous system (SNS) is also called the voluntary nervous system because it allows us to consciously control our movement.
Describe the autonomic nervous system (ANS)
The autonomic nervous system (ANS) is also called the involuntary nervous system because it automatically regulates activities. Which consists of Parasympathetic division and sympathetic division.
What is the fifth step to a change in the environment?
Effectors are target organs and tissues that respond to neural motor commands.
What are the effectors of the ANS system?
Parasympathetic division and sympathetic, which control smooth muscle, cardiac muscle, glands and adipose tissue.
