Question

question 4
the most essential part of bile is:
bile salts.
bile pigments.
cholesterol.
bilirubin.
question 5
microvilli can be found in the:
stomach.
small intestine.
large intestine.
both b and c are correct.
question 6
the part of the colon that lies in the vertical position, on the left side of the abdomen, extending from a point below the stomach and spleen to the level of the iliac crest is the____colon.
ascending
transverse
descending
sigmoid

Explanation:

Question 4

Bile salts are the most essential part of bile as they play a key role in emulsifying fats for digestion. Bile pigments (like bilirubin) are waste products, cholesterol is a minor component, and bilirubin is a type of bile pigment. So the correct option is bile salts.

Microvilli are tiny projections in the small intestine (on the surface of enterocytes) that increase the surface area for absorption. The stomach has rugae, the large intestine has less surface - enhancing structures, and microvilli are not prominent in both small and large intestine (so "Both B and C" is wrong). So microvilli are found in the small intestine.

The descending colon is vertical, on the left side of the abdomen, extending from below the stomach/spleen to the iliac crest. The ascending colon is on the right, transverse is horizontal, and sigmoid is the S - shaped part near the rectum. So the correct option is descending.

Answer:

A. bile salts

Question 5