Question

1) The purpose of circular folds, villi and microvilli in the small intestine is to A)...

1) The purpose of circular folds, villi and microvilli in the small intestine is to

A) allow for stretching of the intestine as food passes through

B) increase surface area for absorption

C) secrete digestive hormones

D) secrete digestive enzymes

2) Stem cells that will form B cells or NK cells are found only in the

A) RED BONE MARROW

B) LIVER  

C) SPLEEN  

D) THYMUS

3) If the disulfide bonds in IgG were broken, how many protein chains would be set free?

A) 9

B) 4

C) 7

D) 8

Science   Anatomy-And-Physiology   
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Homework Answers

Answer #1

Answer;

1. B) increase surface area for absorption

Explanation: the function of the villi and microvilli are to increase the surface area for the absorption. These are the finger like projections of the plasma membrane of the cell.

2. A) RED BONE MARROW

Explanation: hematopoiesis is the process of formation of the blood corppuscles. the stem cells for the hematopoiesis is present only in the red bone marrow. B cell and NK cells are the variant of lymphocytes which are white blood cells.

3. b) 4

Explanation: The IgG antibody molecule is made up of four polypeptide chains, comprising two identical light chains and two identical heavy chains, and can be thought of as forming a flexible Y-shaped structure joined by disulfide bonds.

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