BIOS 256 Exam 1 - –Answer Consists of 2 sets of ganglia or nerv...

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BIOS 256 Exam 1

• Enteric (Intrinsic) nervous system

–Answer Consists of 2 sets of ganglia or nerve plexi –Answer

-Submucosal plexus -Myenteric plexus

• Submucosal plexus (Meissner's plexus)

–Answer -innervates muscularis mucosae and effects glandular secretions -located in the submucosa layer, part of enteric nervous system

• Myenteric plexus (Auerbach's plexus)

–Answer -innervates the muscularis layer of the GI tract and will have an effect on motility -nerve supply between the two layers of the muscularis externa -provides smooth, coordinated contraction for peristalsis

• 4 layers of digestive tract

–Answer -mucosa -submucosa -muscularis externa -serosa

• Deglutition

–Answer the act of swallowing 1 / 2

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• Mastication

–Answer the process of chewing; mixed with saliva to make bolus

• Emulsification

–Answer process of breaking up large fat globules into smaller globules

• Peristalsis

–Answer Waves of smooth muscle contraction that propel the contents of the digestive tract

• Chief cells

–Answer secrete pepsinogen and gastric lipase in the stomach

• Parietal cells

–Answer -secrete HCl, ghrelin and intrinsic factor which is required for the absorption of B12 in the stomach

• GI accessory organs

–Answer -Teeth –Answer mechanically break down food through chewing -Tongue –Answer aids in chewing and swallowing food -Salivary glands –Answer moistens food and begins the chemical digestion process -Liver –Answer secretes bile to emulsify fats in the small intestine

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