Control of smooth muscle in the GI tract Flashcards
1
Q
Name the locations of skeletal voluntary muscle in the GI tract
A
In the pharyn
Top third of the oesophagus
External anal sphincter
2
Q
What are the two types of smooth muscle?
A
Phasic
Tonic
3
Q
What is phasic smooth muscle?
A
Rapid contraction and relaxation
Found in the body of the oesophagus, stomach antrum, small and large intestine
4
Q
What is tonic smooth muscle?
A
Sustained contractions
Found in sphincters (lower oesophageal, ileocaecal, internal anal, orad
5
Q
Which cells of the GI tract are the pacemaker?
A
The interstitial cells of Cajal
6
Q
What three things stimulate the smooth muscle fibres?
A
Stretch
Acetylcholine
Parasympathetic nervous system
7
Q
What is the resting membrane potential of smooth muscle?
A
Slow waves
