1. Autonomic nervous system HBS3A

2. Components of the nervous system Sympathetic Nervous System Parasympathetic Nervous System Autonomic Nervous System (carries information from the CNS to smooth muscle, cardiac muscle and glands) Somatic Nervous System (carries information from the CNS to skeletal muscles) Efferent system (motor division) carries information from the CNS to muscles and glands Afferent system (sensory division) carries information from receptors to the CNS Somatic (from skin and muscle) Visceral (from internal organs) Peripheral Nervous System (nerves) Central nervous system – brain and spinal cord

3. The nervous system The brain is responsible for The spinal cord is responsible for The Peripheral Nervous System consists of N_________ and is responsible for It is divided into the Afferent (or sensory) System which Efferent (or motor) System which The Efferent system is divided into two systems: the S____________ Nervous System which is responsible for the A_______________ Nervous System which is responsible for

4. The nervous system The Central Nervous System consists of the Brain and Spinal Cord. The brain is responsible for control of body, interpretation of sensory information, initiation of muscle movements, consciousness, reasoning and memory. The spinal cord is responsible for carrying messages between the peripheral nervous system and the brain (in both directions) and coordinating spinal reflexes. The Peripheral Nervous System consists of Nerves and is responsible for detecting stimuli (receptors), passing information to the brain/spinal cord (sensory neurons), and passing messages from the brain/spinal cord to muscles and glands (motor neurons). It is divided into the Afferent System which detects stimuli (receptors) and passes information to the brain/spinal cord (sensory neurons), and the Efferent System which passes messages from the brain/spinal cord to muscles and glands (motor neurons). The Efferent system is divided into two systems the Somatic Nervous System which is responsible for controlling skeletal (voluntary) muscle movements, and the Autonomic Nervous System which is responsible for controlling glands or smooth or cardiac (involuntary) muscle movements The Autonomic Nervous system is divided into the Sympathetic and the Parasympathetic systems.

5. The autonomic nervous system

6. The sympathetic nervous system Also known as the This system helps you to respond to Effects include

7. The sympathetic nervous system Also known as the fight or flight system This system helps you to respond to danger or excitement Effects include increased heart rate and breathing rate, increased blood flow to muscles and heart and decreased blood flow to internal organs, sweating, piloerection, reduction in digestive functions and dilated pupils

8. The parasympathetic nervous system Also known as the This system helps you to Effects include

9. The parasympathetic nervous system Also known as the rest and repose system This system helps you to relax Effects include decreased heart rate and breathing rate, decreased blood flow to muscles and heart and increased blood flow to internal organs, increase in digestive functions and constricted pupils

10. Affects of the autonomic nervous system Part of the bodySympathetic Nervous System Fight or flight Parasympathetic Nervous System Rest and repose heart lungs digestive system liver eyes sweat glands bladder hair follicle muscles skin blood vessels muscle blood vessels internal blood vessels

11. Affects of the autonomic nervous system Part of the bodySympathetic Nervous SystemParasympathetic Nervous System heart Increased rate & forceDecreased rate & force lungs Dilation of bronchiolesConstriction of bronchioles digestive system Decreased movement, decreased saliva production Increased movement, increased saliva production liver Increased glucose releaseIncreased glucose uptake eyes Dilation of pupilsConstriction of pupils sweat glands Increased sweat productionDecreased sweat production bladder Relaxation of wall musclesConstriction of wall muscles hair follicle muscles Contract  piloerectionNo effect skin blood vessels Constrict  palenessLittle effect – return to normal muscle blood vessels Dilate  inc blood flowNo effect internal blood vessels Constrict  reduce flow (except heart & lungs) Little effect – return to normal

12. Comparing nervous and hormonal systems Nervous SystemEndocrine system method of travel type of message speed of transmission length of effect specificity of effect time taken to respond

13. Comparing nervous and hormonal systems Nervous SystemEndocrine system method of travel NeuronBloodstream type of message Electrical impulseChemicals speed of transmission FastSlow length of effect Short/immediateLonger lasting specificity of effect Usually very specific – only 1 part of the body responds Can affect many parts of the body at the same time