Question

question 127
0.25 pts
the type of tissue designed for absorption and secretion found throughout much of the gi tract is ______ epithelium.
simple columnar
stratified squamous
simple squamous
pseudostratified
question 128
0.25 pts
the most essential part of bile is:
bile salts.
bile pigments.
cholesterol.
bilirubin.
question 129
0.25 pts
phagocytic cells lining liver sinusoids are called ______ cells.
chief
alpha
kupffer
hepatic

Explanation:

Question 127

To solve this, we recall the functions of different epithelial tissues. Simple columnar epithelium is specialized for absorption and secretion and is found in the GI tract (like the small intestine for nutrient absorption). Stratified squamous is for protection (e.g., skin, esophagus), simple squamous for diffusion (e.g., capillaries, alveoli), and pseudostratified for secretion/movement (e.g., respiratory tract). So the correct type is simple columnar.

Bile's main function is fat emulsification, and bile salts are essential for this process (they break down fats into micelles for digestion). Bile pigments (bilirubin) are waste, cholesterol is a minor component, and bilirubin is a pigment. So bile salts are the most essential part of bile.

Kupffer cells are phagocytic cells lining liver sinusoids, responsible for removing debris, bacteria, etc. Chief cells are in the stomach (secrete pepsinogen), alpha cells in the pancreas (secrete glucagon), and hepatic cells are liver parenchymal cells (not phagocytic). So the correct cell type is Kupffer.

Answer:

A. simple columnar

Question 128