| Questions and Answers on GIT Physiology by Dr Khaled A Abulfadle | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: Questions and Answers on GIT Physiology by Dr Khaled A Abulfadle الجمعة نوفمبر 09, 2012 5:14 am | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Questions and Answers on GIT Physiology by Dr Khaled A Abulfadle الجمعة نوفمبر 09, 2012 5:32 am | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Questions and Answers on GIT Physiology by Dr Khaled A Abulfadle الجمعة نوفمبر 09, 2012 6:04 am | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Questions and Answers on GIT Physiology by Dr Khaled A Abulfadle السبت نوفمبر 10, 2012 5:40 am | |
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| موضوع: رد: Questions and Answers on GIT Physiology by Dr Khaled A Abulfadle الأربعاء أكتوبر 08, 2014 9:31 am | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Questions and Answers on GIT Physiology by Dr Khaled A Abulfadle الأربعاء أكتوبر 08, 2014 11:25 am | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Questions and Answers on GIT Physiology by Dr Khaled A Abulfadle الخميس مايو 04, 2017 8:46 am | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Questions and Answers on GIT Physiology by Dr Khaled A Abulfadle السبت أغسطس 26, 2017 10:02 am | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Questions and Answers on GIT Physiology by Dr Khaled A Abulfadle الأحد أغسطس 27, 2017 9:02 pm | |
| Q: Differences between upper and lower esophageal sphincters ======== Answer
Upper Esophageal Sphincter (UES) is an anatomic sphincter. The main functions of UES closure are to prevent esophageal air insufflation during negative intrathoracic pressure events, for example, inspiration, and to prevent esophagopharyngeal/laryngeal reflux during esophageal peristalsis. The UES is opened intermittently by relaxation of its sphincteric muscles, contraction of its distracting muscles, and bolus pulsion. The function of intermittent UES opening is to allow transphincteric flow of fluid or gas during orthograde events, for example, swallowing, or antegrade events, for example, emesis
Lower Esophageal Sphincter (LES) is a physiologic sphincter It is an anti-reflux barrier prevents reflux of gastric contents into the esophagus, and its dysfunction leads to gastroesophageal reflux disease and or dysphagiA. It maintains tonic closure of the sphincter and relaxes upon swallowing. The LES is composed of smooth muscles, and it maintains tonic contraction owing to myogenic as well as neurogenic factors. It relaxes due to vagally mediated inhibition involving nitric oxide as a neurotransmitter
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Questions and Answers on GIT Physiology by Dr Khaled A Abulfadle السبت مايو 05, 2018 11:39 pm | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Questions and Answers on GIT Physiology by Dr Khaled A Abulfadle الأحد أغسطس 05, 2018 10:01 pm | |
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عدد المساهمات : 9696 تاريخ التسجيل : 06/08/2009
| موضوع: رد: Questions and Answers on GIT Physiology by Dr Khaled A Abulfadle الأحد يوليو 05, 2020 10:26 am | |
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| Questions and Answers on GIT Physiology by Dr Khaled A Abulfadle | |
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