Question 1

All of the following are types of mediated transport EXCEPT one.Identify the exception.

Accepted Answer

A)  facilitated diffusion 
B)  primary active transport 
C)  simple diffusion 
D)  secondary active transport 
A)  facilitated diffusion 
B)  primary active transport 
C)  simple diffusion 
D)  secondary active transport

Question 2

Explain the five rules for diffusion and the two rules for simple diffusion across a membrane.

Accepted Answer

See Table

Question 3

How are molarity and osmolarity different? What property of salts necessitates this distinction? How does this property affect the behavior of water?

Accepted Answer

Molarity is the number of molecules per

Question 4

Water will always move from ________ areas to ________ areas, if there are no impermeable barriers.

Accepted Answer

A)  hyperosmotic, hyposmotic 
B)  hyposmotic, hyperosmotic 
C)  isosmotic, hyposmotic 
D)  hyperosmotic, isosmotic 
A)  hyperosmotic, hyposmotic 
B)  hyposmotic, hyperosmotic 
C)  isosmotic, hyposmotic 
D)  hyperosmotic, isosmotic

Question 5

Which membrane transport process(es)is/are abnormal in people with cystic fibrosis? What is the consequence of the abnormal transport? Which organ systems are affected? How is this disease treated? How long do cystic fibrosis patients normally live? What are some of the possible causes of death related to this disease? What is the cause of cystic fibrosis?

Accepted Answer

Active transport of chloride is impaired

Question 6

Explain why the composition of the phospholipid bilayer determines how readily water passes through it.

Accepted Answer

The phospholipid bilayer is a fluid mosa

Question 7

Match the potential or potential change with the causative circumstances.Assume ion movements are net movements.Answers may be used more than once or not at all.
-Cl⁻ enters the cell

Accepted Answer

A) resting membrane potential 
B) hyperpolarization 
C) depolarization 
D) repolarization 
E) more than one of the answers 
A) resting membrane potential 
B) hyperpolarization 
C) depolarization 
D) repolarization 
E) more than one of the answers

Question 8

Match the potential or potential change with the causative circumstances.Assume ion movements are net movements.Answers may be used more than once or not at all.
-Na⁺ enters the cell

Accepted Answer

A) resting membrane potential 
B) hyperpolarization 
C) depolarization 
D) repolarization 
E) more than one of the answers 
A) resting membrane potential 
B) hyperpolarization 
C) depolarization 
D) repolarization 
E) more than one of the answers

Question 9

When a neuron changes its ion permeability from the resting state,

Accepted Answer

A)  a variety of gated ion channels may open or close. 
B)  Na⁺ channels may open, allowing Na⁺ to enter the cell. 
C)  K⁺ channels must open, allowing K⁺ to enter the cell. 
D)  only a variety of gated ion channels may open or close and Na⁺ channels may open, allowing Na⁺ to enter the cell. 
E)  a variety of gated ion channels may open or close, Na⁺ channels may open, allowing Na⁺ to enter the cell, and K⁺ channels must open, allowing K⁺ to enter the cell. 
A)  a variety of gated ion channels may open or close. 
B)  Na⁺ channels may open, allowing Na⁺ to enter the cell. 
C)  K⁺ channels must open, allowing K⁺ to enter the cell. 
D)  only a variety of gated ion channels may open or close and Na⁺ channels may open, allowing Na⁺ to enter the cell. 
E)  a variety of gated ion channels may open or close, Na⁺ channels may open, allowing Na⁺ to enter the cell, and K⁺ channels must open, allowing K⁺ to enter the cell.

Question 10

Match the transport process to its description.
-the movement of molecules via proteins embedded in the cell membrane; requires ATP

Accepted Answer

A) active transport 
B) passive transport 
A) active transport 
B) passive transport

Question 11

A patient is given an intravenous infusion of glucose solution that has a concentration of 25 grams of glucose per liter.If the infusion is given at a rate of 4 milliliters per minute, what is the mass flow of glucose into the body?

Accepted Answer

25 g glucose/1000 mL

Question 12

When the ions move across the cell membrane, an electrical potential change results.As you are probably aware, nerves trigger muscle movement.When you place your finger on a sharp object (such as a tack), you quickly draw your hand away and develop a sensation of pain.Which types of channels are operating under these conditions to allow nerve conduction and subsequent muscle movement?

Accepted Answer

Mechanically gated (in sensory

Question 13

Which of the following molecules can move across the phospholipid bilayer by simple diffusion?

Accepted Answer

A)  lipids 
B)  steroids 
C)  water 
D)  lipids and water 
E)  All of the answers are correct. 
A)  lipids 
B)  steroids 
C)  water 
D)  lipids and water 
E)  All of the answers are correct.

Question 14

When the kidney goes into failure, one of the signs that doctors will see is that red blood cells will crenate (shrivel up).Why does this happen in kidney failure? What process is occurring to the blood cells?

Accepted Answer

Because the kidney is failing to filter

Question 15

Define the term transport maximum and describe a way cells can increase their transport capacity.

Accepted Answer

The transport maximum occurs when all ca

Question 16

Compare and contrast facilitated diffusion and active transport.

Accepted Answer

Both involve binding of substrate to a c

Question 17

Describe the three major roles of structural proteins.

Accepted Answer

1.connect membrane to the cytoskeleton t

Question 18

How is a carrier protein like a ship canal?

Accepted Answer

See Figure

Question 19

The means by which a cell transports large molecules out of the cell is called

Accepted Answer

A)  phagocytosis. 
B)  endocytosis. 
C)  exocytosis. 
D)  diffusion. 
E)  active transport. 
A)  phagocytosis. 
B)  endocytosis. 
C)  exocytosis. 
D)  diffusion. 
E)  active transport.

Question 20

Which of the following is NOT True of diffusion in the human body?

Accepted Answer

A)  Diffusion occurs faster at higher temperatures. 
B)  Smaller molecules take longer to diffuse than larger ones. 
C)  Net movement of molecules occurs until the osmolarity is equal. 
D)  Diffusion is rapid over short distances and slower over longer distances. 
A)  Diffusion occurs faster at higher temperatures. 
B)  Smaller molecules take longer to diffuse than larger ones. 
C)  Net movement of molecules occurs until the osmolarity is equal. 
D)  Diffusion is rapid over short distances and slower over longer distances.

Exam 5: Membrane Dynamics

All of the following are types of mediated transport EXCEPT one.Identify the exception.

Explain the five rules for diffusion and the two rules for simple diffusion across a membrane.

How are molarity and osmolarity different? What property of salts necessitates this distinction? How does this property affect the behavior of water?

Water will always move from ________ areas to ________ areas, if there are no impermeable barriers.

Explain why the composition of the phospholipid bilayer determines how readily water passes through it.

Match the potential or potential change with the causative circumstances.Assume ion movements are net movements.Answers may be used more than once or not at all. -Cl⁻ enters the cell

Match the potential or potential change with the causative circumstances.Assume ion movements are net movements.Answers may be used more than once or not at all. -Na⁺ enters the cell

When a neuron changes its ion permeability from the resting state,

Match the transport process to its description. -the movement of molecules via proteins embedded in the cell membrane; requires ATP

A patient is given an intravenous infusion of glucose solution that has a concentration of 25 grams of glucose per liter.If the infusion is given at a rate of 4 milliliters per minute, what is the mass flow of glucose into the body?

Which of the following molecules can move across the phospholipid bilayer by simple diffusion?

When the kidney goes into failure, one of the signs that doctors will see is that red blood cells will crenate (shrivel up).Why does this happen in kidney failure? What process is occurring to the blood cells?

Define the term transport maximum and describe a way cells can increase their transport capacity.

Compare and contrast facilitated diffusion and active transport.

Describe the three major roles of structural proteins.

How is a carrier protein like a ship canal?

The means by which a cell transports large molecules out of the cell is called

Which of the following is NOT True of diffusion in the human body?

Introduction to Physiology

Molecular Interactions

Compartmentation: Cells and Tissues

Energy and Cellular Metabolism

Communication, Integration, and Homeostasis

Introduction to the Endocrine System

Neurons: Cellular and Network Properties

The Central Nervous System

Sensory Physiology

Efferent Division: Autonomic and Somatic Motor Control

Muscles

Integrative Physiology I: Control of Body Movement

Cardiovascular Physiology

Blood Flow and the Control of Blood Pressure

Blood

Mechanics of Breathing

Gas Exchange and Transport

The Kidneys

Integrative Physiology II: Fluid and Electrolyte Balance

The Digestive System

Metabolism and Energy Balance

Endocrine Control of Growth and Metabolism

The Immune System

Integrative Physiology III: Exercise

Reproduction and Development

Filters

Water will always move from areas to areas, if there are no impermeable barriers.