The Nervous System
- Created by: Thunder1107
- Created on: 06-09-17 16:54
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- The Nervous System
- Peripheral Nervous System (PNS)
- Sympathetic Nervous System
- Neurons from the SNS travel to most organs and glandsto prepare the body
- It uses the neurotransmitter noradrenaline
- Such as, increasing heart rate, breathing rate, dilating blood vessels
- The SNS is involved with the fight or flight response
- Autonomic Nervous System (ANS)
- The ANS has two parts the sympathetic and parasympathetic NS which regulate the same organs but do the opposite
- Involuntary actions are controlled by the ANS
- Involuntary actions include breathing, swallowing and digestion
- Parasympathetic Nervous System
- The PNS slows down heart rate and breathing rate
- The PNS relaxes somebody after an emergency has passed
- It works opposing the SNS
- It uses the neurotransmitter acetylcholine
- Somatic Nervous System (SNS)
- The nerves have both sensory and motor neurons
- 12 pairs of cranial nerves and 31 pairs of spinal nerves
- Sensory neurons relay info to the CNS and motor neurons relay info from the CNS
- It is also involved in reflex actions without the involvement of the CNS
- Sympathetic Nervous System
- Central Nervous System (CNS)
- It comprises of the brain and the spinal cord
- It regulates the body's physiological processes
- The brain receives info from the sensory receptors and sends it to muscles and glands
- The spinal cord relays info between the brain and the rest o the body
- The brain is in four parts: cerebrum; cerebellum; brain stem + diencephalon
- The cerebrum is the largest part and is divided into 4 lobes. It is also split into 2 cerebral hemispheres
- The brain stem regulates automatic functions e.g. breathing, swallowing and heart beats
- The cerebellum is at the back of the brain and controls motor functions
- The diencephalon lies above the brain stem and includes the thalamus and hypothalamus
- The hypothalamus regulates body temp, hunger and thirst. It also is connected to the release of hormones
- The thalamus acts as a relay station for incoming nerve impulses
- Peripheral Nervous System (PNS)
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