Question 1

Which of the following is true of oral rehydration therapy?

Accepted Answer

A) It is used to treat severe diarrhea. 
B) The presence of glucose aids the intestinal absorption of Na+ and water. 
C) It saves more than a million small children per year. 
D) All of these choices are correct.

Question 2

Hydrophobic molecules usually enter a cell via ___________.

Accepted Answer

A) osmosis 
B) active transport 
C) diffusion 
D) protein channels

Question 3

Matrix metalloproteinases

Accepted Answer

A) degrade the basal lamina. 
B) synthesize collagen in the extracellular matrix. 
C) may be active in invasive cancer cells. 
D) synthesize proteoglycans in the extracellular matrix.

Question 4

The process in which waste molecules are removed from the blood by having them diffuse through an artificial porous membrane is called dialysis.

Accepted Answer

A) True 
 B)False

Question 5

The extracellular matrix is made up of collagen, elastin, and a gel-like ground substance.

Accepted Answer

A) True 
 B)False

Question 6

Individuals suffering from cystic fibrosis have defective ____________ ion channels.

Accepted Answer

A) sodium 
B) potassium 
C) calcium 
D) chloride

Question 7

Hypertonic solutions stimulate cellular lysis.

Accepted Answer

A) True 
 B)False

Question 8

The Na+/K+ pump

Accepted Answer

A) establishes equilibrium concentrations of sodium and potassium ions. 
B) is an electrogenic pump. 
C) is an example of secondary active transport. 
D) interferes with glucose transport.

Question 9

The charge difference across a membrane produces the membrane potential.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following is NOT true of a person who is dehydrated?

Accepted Answer

A) plasma osmolality increases 
B) hypothalamus stimulates release of ADH 
C) ADH causes the kidneys to excrete water 
D) increased osmolality causes thirst

Question 11

Which of the following is NOT true of hypoglycemia?

Accepted Answer

A) It can result in death. 
B) It may be due to diabetes. 
C) It is characterized by high plasma glucose levels. 
D) Both it can result in death and it may be due to diabetes are correct.

Question 12

Diffusion is more rapid in cells with microvilli compared to cells lacking microvilli.

Accepted Answer

A) True 
 B)False

Question 13

Transport of materials through an epithelial cell is called

Accepted Answer

A) paracellular transport. 
B) transcellular transport. 
C) bulk transport. 
D) exocytosis.

Question 14

How much of the extracellular fluid makes up the blood plasma?

Accepted Answer

A) 33% 
B) 92% 
C) 20% 
D) 50%

Question 15

Glucose entry into the cell is by facilitated diffusion.

Accepted Answer

A) True 
 B)False

Question 16

What cofactor do matrix metalloproteinases need to be functional?

Accepted Answer

A) calcium 
B) copper 
C) chromium 
D) zinc

Question 17

The Na+/K+ pump creates a ____________ charge inside the cell.

Accepted Answer

A) positive 
B) negative

Question 18

Plasma freezes at

Accepted Answer

A) -1.86$\circ$C. 
B) -1.00$\circ$C. 
C) -0.56$\circ$C. 
D) 0.00$\circ$C.

Question 19

Which of the following is able to passively penetrate the plasma membrane?

Accepted Answer

A) O2 
B) small charged particles 
C) large polar molecules 
D) All of these choices are correct.

Question 20

Cells placed in hypotonic solutions will

Accepted Answer

A) decrease in volume. 
B) increase intracellular solute concentration. 
C) increase in volume. 
D) lose water to the solution.

Exam 6: Interactions Between Cells and The Extracellular Environment

Which of the following is true of oral rehydration therapy?

Hydrophobic molecules usually enter a cell via ___________.

Matrix metalloproteinases

The process in which waste molecules are removed from the blood by having them diffuse through an artificial porous membrane is called dialysis.

The extracellular matrix is made up of collagen, elastin, and a gel-like ground substance.

Individuals suffering from cystic fibrosis have defective ____________ ion channels.

Hypertonic solutions stimulate cellular lysis.

The Na⁺/K⁺ pump

The charge difference across a membrane produces the membrane potential.

Which of the following is NOT true of a person who is dehydrated?

Which of the following is NOT true of hypoglycemia?

Diffusion is more rapid in cells with microvilli compared to cells lacking microvilli.

Transport of materials through an epithelial cell is called

How much of the extracellular fluid makes up the blood plasma?

Glucose entry into the cell is by facilitated diffusion.

What cofactor do matrix metalloproteinases need to be functional?

The Na⁺/K⁺ pump creates a ____________ charge inside the cell.

Plasma freezes at

Which of the following is able to passively penetrate the plasma membrane?

Cells placed in hypotonic solutions will