A&P Unit 4 Lecture- Ch 15 ANS and Reflexes

Explain how the autonomic and somatic nervous systems differ in form and function.
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Terms in this set (14)
Sympathetic division (stress)‚Äč
-Prepares body for physical activity: exercise, trauma, arousal, competition, anger, or fear
‚Äč--Increases heart rate, BP, airflow, blood glucose levels, etc.‚Äč
--Reduces blood flow to the skin and digestive tract‚Äč
--"Fight-or-flight"‚Äč
Parasympathetic division ‚Äč
-Calms many body functions reducing energy expenditure and assists in bodily maintenance‚Äč
--Digestion and waste elimination‚Äč
--"Resting and digesting" state‚Äč
Tympanic membrane‚Äč
--Has 18 times area of oval window‚Äč
--Ossicles concentrate the energy of the vibrating tympanic membrane on an area 1/18 that size‚Äč
--Ossicles create a greater force per unit area at the oval window and overcome the inertia of the perilymph‚Äč
--movement of oval window presses fluid around basilar membrane and places pressure on round window which coverts pressure to action potential
Retina ‚Äč
-Attached to eye only at optic disc (posterior exit of optic nerve) and ora serrata (anterior edge of retina)‚Äč
-Pressed against rear of eyeball by vitreous humor‚Äč
-Detached retina causes blurry areas of vision and can lead to blindness‚Äč
-Macula lutea: patch of cells on visual axis of eye‚Äč
-Fovea centralis: pit in center of macula lutea‚Äč
-Blood vessels of the retina‚Äč

Rod Cell- night vision
Cone Cell- day vision