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Describe the function of the nervous system
No.1
The nervous system analyses sensory information from the body and the external environment, it stores some aspects and makes decisions regarding appropriate responses and behaviours
Nervous system
Sensory input
Storage
Decisions
Responses
Describe the function of the nervous system.
No.2
The nervous system makes the motor responses by initiating muscular contractions or glandular secretions.
Contractions
Secretions
Outline the structure of the human nervous system.
The central nervous system (CNS) consists of the brain and spinal cord.
Central nervous system (CNS)
Brain
Spinal cord
The brain processes information and the spinal cord connects the brain to the Peripheral nervous system (PNS).
Peripheral nervous system (PNS)
No.3
The PNS is a collection of nerves carrying information to and from all parts of the body. It consists of the Somatic nervous system (SNS) and Automatic (ANS).
Somatic nervous system (SNS)
Automatic nervous system (ANS)
State the role of the Somatic nervous system (SNS)
Sensory and motor neurons of the somatic nervous system (SNS) control the voluntary movements of skeletal muscles.
Sensory
Motor
(SNS)
Voluntary movements
Skeletal
State the role of the Autonomic nervous system (ANS)
Homeostatic control through the sensory neurons and motor neurons conducting involuntary impulses to smooth muscle, cardiac muscle and glands.
Homeostatic control
Involuntary
Smooth
Cardiac
Describe how the ANS maintains a steady internal state
The ANS consists of two antagonistic groups of nerve fibres- the Sympathetic nerve fibres and Parasympathetic nerve fibres.
Antagonistic- they exert an opposing influence which keeps systems balanced
Antagonistic
Sympathetic
Parasympathetic
Balance
Describe the action of the Symthepathetic nerve fibres
Increase heart rate; Increase rate and depth of breathing; decrease the rate of peristalsis in the gut and the secretion of digestive juices. (Fight or Flight responses)
Increase
Rate
Depth
Peristalsis
Secretion
Describe the action of the Parasympathetic nerve fibres
Decrease heart rate; Decrease rate and depth of breathing; increase the rate of peristalsis in the gut and the secretions of digestive juices. (Rest & Digest responses)
Decrease
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