MB ChB Year 1: Nutrition and Energy

Lecture 3: Motility

Dr Malcolm Hunter

The unitary nature of the smooth muscle of the GIT and the role of the nexi in the transmission of the electrical signal between cells; slow wave electrical activity, spike activity and contractile activity; receptive-relaxation; vago-vagal reflexes; enterogastric reflex and "enterogastrone"; peristalsis and segmentation; migrating motor complex; peristalsis, haustral shuffling and mass propulsive movements in the colon; the defaecation reflex, initiation, sampling and the control of the internal and external sphincters.

Dr Hunter's Powerpoint presentations are available on the VLE.

Recommended reading

Gastrointestinal physiology 6th edn. by Leonard R. Johnson, Mosby, 2001

Physiology 5th edn. by Berne & Levy (Chapters 37, 38 & 39) Mosby, 2005

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