Class Notes (836,323)
United States (324,458)
Biology (619)
BIOL 1117 (81)
Lecture

Autonomic Nervous System

2 Pages
79 Views
Unlock Document

Department
Biology
Course
BIOL 1117
Professor
Christopher Richardson
Semester
Fall

Description
Autonomic Nervous System • autonomic nervous system (ANS): motor nervous system that  controls glands, cardiac muscle, and smooth muscle  – also called visceral motor system – primary target organs of the ANS • viscera of thoracic and abdominal cavities • some structures of the body wall • Blood vessels, sweat glands and piloerector muscles – carries out actions involuntarily; without our awareness • However, conscious thoughts can affect ANS – visceral effectors do not depend on the ANS to function • only to adjust their activity to the body’s changing  conditions • ANS is the efferent (motor) pathways although some sources include  the visceral afferent (sensory) pathways  • visceral reflexes: unconscious, automatic, stereotyped responses to  stimulation – involving visceral receptors and effectors  – Slower responses than somatic reflexes (e.g., stomach acid  secretion in response to the smell of food) • visceral reflex arc – receptors that detect tissue damage, detect stretch in tissues or  organs, detect chemical levels in blood (pH, body temperature  and other internal stimuli) – afferent neurons which lead to the CNS – Interneurons in the CNS – efferent neurons which carry motor signals away from the CNS – effectors – • Divisions of ANS: sympathetic division  – prepares body for physical activity: exercise, trauma, arousal,  competition, anger, or fear • increases heart rate, BP, airflow, blood glucose levels, etc • reduces blood flow to the skin and digestive tract parasympathetic division  – calms many body functions reducing energy expenditure and  assists in bodily maintenance   • digestion and waste elimination • “
More Less

Related notes for BIOL 1117

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit