Page 955 - Fundamentals of anatomy physiology

942 Unit 5 Environmental Exchange

Figure 24–23 The Functions of Major Digestive Tract Hormones. The primary actions

of gastrin, GIP, secretin, CCK, and VIP are shown.

Ingested
food

Hormone Action

Food in
stomach

Gastrin Acid production by KEY
parietal cells stimulates
inhibits
Stimulation of gastric
motility; mixing waves facilitates
increase in intensity
NUTRIENT
GIP Release of insulin from UTILIZATION
pancreas BY ALL TISSUES

Chyme in Secretin Release of pancreatic
duodenum and CCK enzymes and buffers

VIP Bile secretion and
ejection of bile from
gallbladder

Dilation of intestinal
capillaries

facilitates

Material Nutrient absorption
arrives in
24
jejunum

24-7 The large intestine is to the stomach and liver and almost completely frames the
small intestine (Figure 24–1). The large intestine stores digestive
divided into three parts with regional wastes and reabsorbs water. Resident bacteria in the large intes-
specialization tine are an important source of vitamins, especially vitamin K,
biotin, and vitamin B5.
Learning Outcome Describe the gross and histological structures of the
large intestine, including its regional specializations and role in nutrient The large intestine, also known as the large bowel, has an
absorption. average length of about 1.5 meters (4.9 ft) and a width of
7.5 cm (3 in.). We can divide it into three parts: (1) the
The horseshoe-shaped large intestine begins at the end of pouchlike cecum, the first portion of the large intestine;
the ileum and ends at the anus. The large intestine lies inferior