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Flashcards in Digestive System Deck (128)
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61

In L, how much gastric juices is secreted per day?

3L

62

What regulates secretion?

long and short reflexes and hormones

63

What are the 3 phases of the gastric secretion?

cephalic, gastric, and intestinal

64

When does the cephalic phase occur?

Before food enters the stomach

65

What triggers the cephalic phase?

triggered by smell, taste, sight or thought

66

Which nerve stimulates the enteric neurons?

vagus causing secretion

67

When does the gastric phase occur?

once food reaches the stomach

68

How much gastric juice is the in the stomach?

2/3

69

What provoked the gastric phase?

distension of short and long reflexes, peptides and rising pH stimulate gastrin

70

When does the intestinal phase occur?

Once food enters the duodenum

71

How is the intestinal phase inhibited?

enterogastric reflex and release of intestinal hormones

72

What provokes the intestinal phase?

distension of duodenum, presence of fats, and acidic chyme

73

What is inhibited to promote gastric secretion?

Enteric neurons and vagus nerves

74

Which 2 hormones are secreted by intestinal hormones?

cholecystokinin and secretin

75

In gastric contractile activity what happen to chyme?

3 ml into dudoenum and 27mL forced back into stomach

76

Where does the small intestine begin or end?

begins at pyloric sphincter and ends at ileocecal valve

77

From proximal to distal what are the parts of the small intestine?

duodenum, jejunum, and ileum

78

Where are the bile duct and main pancreatic duct located?

Bile duct: from liver

Main pancreatic duct: pancreas unite in wall of duodenum

79

What controls entry of bile and pancreatic juice?

Hepatopancreatic sphincter

80

What are the 3 structural modifications in the small intestine?

circular folds, villi, microvilli

81

What is the function of the 3 structural modifications in the small intestine?

increase surface area for absorption

82

What forms the circular folds? Purpose

Formed by mucosa and submucosa.

Forces chyme ti slowly spiral through lumen

83

Fingerlike projections of mucosa and contain capillary beds and lacteals

Villi

84

Form brush border and brush border enzymes

microvilli

85

What do the pits of the villi lead?

intestinal crypts

86

Secretory cells

intestinal juice

87

lymphoid nodules in mucosa of ilium

peyer's patches

88

submucosa of duodenum, secrete alkaline in mucus

dudodenal glands

89

Produces bile

liver

90

stores and concentrates bile

gallbladder