20. In capillary exchange, lipid-solublemolecules, like oxygen and carbon dioxid

Question

20.In capillary exchange, lipid-solublemolecules, like oxygen and carbon dioxide, pass from the blood to the tissues through

(a)water-filledpathways called pores

(b)tight junctions

(c)the lipid components of endothelial cell membranes

(d)endothelial vesicles

(e)large pores

23.Blood flows through what percent of skeletal muscle capillaries at rest?

(a)10%

(b)25%

(c)50%

(d)75%

(e)90%

24.Capillary pores are the water-filledpathways that allow passage of watersoluble molecules from the blood to the tissue. Pores typically exclude molecules like

(a)inorganic ions

(b)glucose

(c)amino acids

(d)albumin and globular proteins

(e)all of the above

Explanation / Answer

Question 22

Answer is C

the lipid components of endothelial cell membranes.

The membrane of endothelial cells is made of a lipid bilayer. so the blood diffuse carbon dioxide and oxygen through the lipid components of endothelial cell membranes.

Question 23.

Answer is B

25%

The skeletal muscle receives only 25% of blood even though it occupies 45% of body mass.

Brain - 14 %

Liver - 25%

Heart - 45 %

kidney - 20%

skin - 7.5%

Question 24

Answer is D

albumin and globular proteins.

The pores allow the passage of water-soluble molecules like water, glucose amino acids, inorganic ions and other substances except for albumin and globulin proteins

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