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Nervous System
- Master controlling and communicating system of the body
1. Sensory Input
2. Integration
3. Motor Output
3 Overlapping functions of the Nervous System
Sensory Input
- Nervous system uses it millions of sensory receptors to monitor changes occurring both inside and outside the body
- The gathered information is called?
Integration
- The nervous system processes and interprets sensory input and decides what should be done at each moment - a process called what?
Motor Output
- The nervous system activates effector organs such as the muscles and glands to cause a response, called the?
Central Nervous System
- Consists of the brain and spinal cord
- Integrating and control center of the nervous system
- Interprets sensory input and dictates motor output based on reflexes, current conditions and past experience
- Tracts (bundle of axons)
- Nuclei (collection of nerve cell bodies)
Peripheral Nervous System
- Consists mainly of nerves (bundles of axons) that extend from the brain and spinal cord, and ganglia (collections of neuron cell bodies)
- Cranial and spinal nerves carry impulses to and from the brain and spinal cord
Sensory (Afferent = "carrying toward")
Motor (Efferent = "carrying away")
PNS 2 Functional Subdivisions
Sensory Afferent Division
- Consist of nerve fibers (Axons) that convey impulses to the central nervous system from sensory receptors located throughout the body
- Somatic: Convey impulses from the skin, skeletal muscles and joints
- Visceral: Transmit impulses from the visceral organs (organs within the ventral body cavity)
Motor Efferent Division
- Transmits impulses from the CNS to effector organs, which are the muscles and glands, and activates them to contract or secrete
- Two main parts called the somatic and autonomic/visceral nervous system
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