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kicyunya [14]
3 years ago
10

The absorptive effectiveness of the small intestine is enhanced by increasing the surface area of the mucosal lining. Which of t

he following accomplish this task?
a. the rugae and haustra
b. plicae circulares, villi, and microvilli
c. the vast array of digestive enzymes
d. Brunner's glands and Peyer Patches
Biology
1 answer:
ser-zykov [4K]3 years ago
7 0

Answer:

Option B

The plicae circulares, villi, and microvilli

Explanation:

The plicae circulares are the folds of mucous membrane on the inside of the small intestine. They are covered with tiny hair-like structures called the villi, and microvilli. The purpose of those folds is to increase the surface area for the absorption of food nutrients to take place in the small intestine before the food finally moves on to the large intestine for excretion.

The tiny hair-like projections (villi, and microvilli) further increase the surface area available for nutrient absorption by providing extra surfaces in which the nutrients can diffuse into the small intestine through.

This makes option B correct.

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Answer:

Transmission electron microscope (MET): allows sample observation in ultra-thin sections. A TEM directs the electron beam towards the object to be increased. A part of the electrons bounce or are absorbed by the object and others pass through it forming an enlarged image of the specimen. To use a TEM, the sample must be cut into thin layers, not larger than a couple thousand thousands of angstroms. A photographic plate or a fluorescent screen is placed behind the object to record the enlarged image. Transmission electron microscopes can increase an object up to a million times.

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6 0
3 years ago
Which describes oxygen content as Earth evolved over time? Oxygen levels sharply declined about 400 million years ago. Oxygen le
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Answer:

Oxygen levels stay above 15 percent starting 200 million years ago

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Atmospheric oxygen levels are related to the evolution on Earth and changes in geochemical cycles that involve climate variations.

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So, form the starting 200 million years ago, oxygen level stay above 15 percent and the correct option is "B".

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