Functions of sympathetic and parasympathetic divisions

FUNCTIONS OF SYMPATHETIC AND PRASYMPATHETIC DIVISIONS

HETIC AND NS

Effector organ

Sympathetic

Receptor

Parasympathetic

Heart S A node

Increased in heart rate 

             b1  

Decrease in heart rate 

Atria

Increase contractility and conduction velocity

b1

¯ contractility &

­ conduction velocity

AV node and Conduction system

­ conduction velocity

b1

¯ conduction velocity

Ventricles

contractility & conduction velocity

b2

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Arterioles

Coronary, skeletal, Pulmonary, renal, Abdominal & skin

Vasoconstriction

Dilatation

a

b2

Dilatation

Systemic veins

Constriction or Dilatation

a / b2

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Respiratory tract

Bronchial muscles

Relaxation 

b2  

Contraction 

Bronchial glands

Inhibition?

 

Stimulation

Smooth muscles

G. I. Tract

 

Decreased motility

Sphincter constriction

Inhibits secretion?

a, b2

a

Increased motility

Sphincter relaxation

Stimulates secretion

Gall Bladder

Relaxation

 

Contraction

Urinary bladder

Muscle

Sphincter

Relaxation

Contraction 

b

a 

Constriction

Relaxation 

Ureters

Increase motility

a

Increase?

Uterus

Variable Contraction

a, b2

Variable

Male Sex organs

Ejaculation

a

Erection

Sweat glands

Localised secretion

 

Generalised secretion

Secretions

Salivary

Vasoconstriction

Thick, viscous secretion 

a  

Copious and watery  

Pancreatic

Decreased secretion

¯ insulin & glucagon secretion

a

b

Increased secretion

­insulin & glucagon Secretion

Gastric

viscous secretion

 

­secretion

Juxtaglomerular cells

Increased renin secretion

b

--

Pineal gland

Increased melatonin secretion

b

--

Milk letdown

Inhibition

 

--

Ciliary muscle

Relaxation (far vision)

b

Constriction (near vision)

Pupillary muscle

Dilatation (dim light)

 

Constriction (bright light)

BMR  

Increased

 

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Last modified: Wednesday, 14 September 2011, 5:06 AM