BMS129 Lecture Notes - Lecture 9: Sympathetic Nervous System, Parasympathetic Nervous System, Bronchodilator
NERVOUS SYSTEM
Lecture 9 - Autonomic NS Physiology
Recommended readings
: CH 15 pp 568-573
1. State 5 actions of the sympathetic nervous system
2. State 5 actions of the parasympathetic nervous system
3. Name the neurotransmitters used at the different ANS synapses
4. Name the receptors for these neurotransmitters & explain their autonomic effects
5. Explain how the ANS controls many target organs using dual innervation and
give an example
6. Explain how ANS control is exerted in the absence of dual innervation and give
an example
7. Describe how the ANS is influenced by the central nervous system
State 5 actions of the sympathetic nervous system
SNS prepares the body for intense physical activity such as in emergencies
1. Increase heart rate
2. Increase pulmonary airflow (bronchodilation)
3. Redirect blood to vital areas e.g. muscles, lungs & away from intestines, skin etc.
4. Inhibit digestive system (decreased peristalsis)
5. Increase blood glucose concentration
6. Increases metabolism
State 5 actions of the parasympathetic nervous system
1. Decrease in heart rate
2. Decrease in pulmonary flow (bronchoconstriction)
3. Increased glandular secretion (nasal, lacrimal, salivary)
4. Increased peristalsis and digestive enzyme activity
5. Relaxation of gut sphincters
6. Penile erection
Name the neurotransmitters used at the different ANS synapses
Preganglionic fibres
Postganglionic fibres
Acetylcholine
Norepinephrine (adrenergic neurons)
Acetylcholine (cholinergic neurons) e.g.
sweat glands, piloerector muscles
Name the receptors for these neurotransmitters & explain their autonomic effects
Category
Effects
Adrenergic (binds with epinephrine and
norepinephrine)
Cholinergic (binds with acetylcholine)
All somatic motor neurons: excitatory
Document Summary
State 5 actions of the sympathetic nervous system. Sns prepares the body for intense physical activity such as in emergencies. Increase pulmonary airflow (bronchodilation: redirect blood to vital areas e. g. muscles, lungs & away from intestines, skin etc. State 5 actions of the parasympathetic nervous system: decrease in heart rate, decrease in pulmonary flow (bronchoconstriction) Increased peristalsis and digestive enzyme activity: relaxation of gut sphincters, penile erection. Name the neurotransmitters used at the different ans synapses. Acetylcholine (cholinergic neurons) e. g. sweat glands, piloerector muscles. Name the receptors for these neurotransmitters & explain their autonomic effects. Most postganglionic parasympathetic neurons: usually excitatory but may be inhibitory (e. g. slows hr) Ne relaxes and dilates the bronchioles when it binds to -adrenergic receptors of the bronchial smooth muscle. Excitatory effect when ne binds to the. Different effects from same neurotransmitter and receptor relate to the different subclasses.
