Question 1

The three major subdivisions of a cell are the ____________________, the ____________________, and the ____________________.

Accepted Answer

plasma membrane; nucleus; cyto

Question 2

Most of the membrane potential of the plasma membrane is established by the active transport of sodium and potassium ions.

Accepted Answer

A) True 
 B)False

Question 3

Sheets of epithelial cells are joined by gap junctions.

Accepted Answer

A) True 
 B)False

Question 4

The following questions refer to comparative concentrations, permeabilities, and potentials under various circumstances. Match the relationship between the two items, a. and B.., with the qualifications labelled a. through c. (Options may be used more than once or not at all.)
a.A is greater than B
b.B is greater than A
c.A and B are equal
-A. resting membrane potential in a typical nerve cell
B. equilibrium potential for K+

Accepted Answer

Question 5

What is cystic fibrosis caused by?

Accepted Answer

A) thick mucus build-up 
B) salt accumulation by increased levels of insulin 
C)  chloride channels in plasma membranes 
D)  potassium channels in plasma membranes 
A) thick mucus build-up 
B) salt accumulation by increased levels of insulin 
C)  chloride channels in plasma membranes 
D)  potassium channels in plasma membranes

Question 6

Axons can range in length from less than a millimetre to over one ____________________.

Accepted Answer

The answer of Axons can range in length from less...

Question 7

If red blood cells are placed in a ____________________ solution, water leaves the cells, causing them to crenate.

Accepted Answer

The answer of If red blood cells are placed in...

Question 8

____________________ refers to a separation of opposite charges across the membrane.

Accepted Answer

The answer of ____________________ refers to a separation of opposite...

Question 9

At ____________________ potential, typically around -55 mV, rapid depolarization occurs.

Accepted Answer

The answer of At ____________________ potential, typically around -55 mV,...

Question 10

Which of the following statements concerning gap junctions is NOT correct?

Accepted Answer

A) Gap junctions are communicating junctions. 
B) At a gap junction, filaments of unknown composition extend between the plasma membranes of two closely adjacent but not touching cells, acting as "spot rivets" to anchor the cells together. 
C)  Gap junctions are formed by small connecting tunnels that link two adjacent cells and permit exchange of small water-soluble particles between the cells. 
D)  Gap junctions play an important role in transmission of electrical activity throughout an entire muscle mass. 
A) Gap junctions are communicating junctions. 
B) At a gap junction, filaments of unknown composition extend between the plasma membranes of two closely adjacent but not touching cells, acting as "spot rivets" to anchor the cells together. 
C)  Gap junctions are formed by small connecting tunnels that link two adjacent cells and permit exchange of small water-soluble particles between the cells. 
D)  Gap junctions play an important role in transmission of electrical activity throughout an entire muscle mass.

Question 11

Which of the following is the correct statement about passive diffusion?

Accepted Answer

A) It depends on random motion. 
B) It involves active forces. 
C)  Its rate increases as the temperature decreases. 
D)  Molecules move from a lower concentration to a higher concentration. 
A) It depends on random motion. 
B) It involves active forces. 
C)  Its rate increases as the temperature decreases. 
D)  Molecules move from a lower concentration to a higher concentration.

Question 12

Match the ions, labelled a. through d., with their various roles. (Options may be used more than once or not at all.)
a.NaS1U1P1+S1S1P0
b.KS1U1P1+S1S1P0
c.AS1U1P1-S1S1P0
d.ClS1U1P1-S1S1P0
-ion whose equilibrium potential is opposite in charge of the resting membrane potential

Accepted Answer

The answer of Match the ions, labelled a. through d.,...

Question 13

Which of the following statements concerning the plasma membrane is correct?

Accepted Answer

A) Under a light microscope, the plasma membrane appears as a trilaminar structure. 
B) The carbohydrates on the outer surface of the membrane serve as receptor sites for binding chemical messengers in the environment of the cell. 
C)  The lipid bilayer serves as a barrier to the passage of H2O-soluble substances through the membrane. 
D)  Carrier proteins shuttle back and forth across the membrane as they carry passenger molecules from one side to the other. 
A) Under a light microscope, the plasma membrane appears as a trilaminar structure. 
B) The carbohydrates on the outer surface of the membrane serve as receptor sites for binding chemical messengers in the environment of the cell. 
C)  The lipid bilayer serves as a barrier to the passage of H2O-soluble substances through the membrane. 
D)  Carrier proteins shuttle back and forth across the membrane as they carry passenger molecules from one side to the other.

Question 14

Which of the following can be found within the nucleus?

Accepted Answer

A) deoxyribonucleic acid 
B) cytosol 
C)  plasma membrane 
D)  endoplasmic reticulum 
A) deoxyribonucleic acid 
B) cytosol 
C)  plasma membrane 
D)  endoplasmic reticulum

Question 15

Because a solution of lower solute concentration has a higher concentration of water, it exerts a lower osmotic pressure than does a solution with a higher solute concentration.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following is the normal direction for the movement of an action potential along part of a neuron?

Accepted Answer

A) axon hillock to cell body 
B) axon terminals to collateral axon 
C)  axon to dendrites 
D)  dendrites to cell body 
A) axon hillock to cell body 
B) axon terminals to collateral axon 
C)  axon to dendrites 
D)  dendrites to cell body

Question 17

Why does the relative refractory period occur after the action potential is complete?

Accepted Answer

A) because of the activation of the voltage-gated Na+ channels 
B) because of the slowness of the voltage-gated channels 
C)  because of the sodium-potassium pump 
D)  because of quick potassium efflux 
A) because of the activation of the voltage-gated Na+ channels 
B) because of the slowness of the voltage-gated channels 
C)  because of the sodium-potassium pump 
D)  because of quick potassium efflux

Question 18

Match the ions, labelled a. through d., with their various roles. (Options may be used more than once or not at all.)
a.NaS1U1P1+S1S1P0
b.KS1U1P1+S1S1P0
c.AS1U1P1-S1S1P0
d.ClS1U1P1-S1S1P0
-ion that is actively transported into the cell

Accepted Answer

The answer of Match the ions, labelled a. through d.,...

Question 19

Which of these substances is most likely to passively diffuse across the plasma membrane by dissolving in the membrane?

Accepted Answer

A) a cation 
B) an anion 
C)  a nonpolar or nonionized molecule 
D)  a polar molecule 
A) a cation 
B) an anion 
C)  a nonpolar or nonionized molecule 
D)  a polar molecule

Question 20

The cells of excitable and nonexcitable tissues share which one of these properties?

Accepted Answer

A) a threshold potential 
B) a resting membrane potential 
C)  an ability to open the Na+ gates 
D)  an ability to open the K+ gates 
A) a threshold potential 
B) a resting membrane potential 
C)  an ability to open the Na+ gates 
D)  an ability to open the K+ gates

The three major subdivisions of a cell are the , the , and the .

Most of the membrane potential of the plasma membrane is established by the active transport of sodium and potassium ions.

Sheets of epithelial cells are joined by gap junctions.

What is cystic fibrosis caused by?

Axons can range in length from less than a millimetre to over one ____________________.

If red blood cells are placed in a ____________________ solution, water leaves the cells, causing them to crenate.

____________________ refers to a separation of opposite charges across the membrane.

At ____________________ potential, typically around -55 mV, rapid depolarization occurs.

Which of the following statements concerning gap junctions is NOT correct?

Which of the following is the correct statement about passive diffusion?

Match the ions, labelled a. through d., with their various roles. (Options may be used more than once or not at all.) a.Na⁺ b.K⁺ c.A^- d.Cl^- -ion whose equilibrium potential is opposite in charge of the resting membrane potential

Which of the following statements concerning the plasma membrane is correct?

Which of the following can be found within the nucleus?

Because a solution of lower solute concentration has a higher concentration of water, it exerts a lower osmotic pressure than does a solution with a higher solute concentration.

Which of the following is the normal direction for the movement of an action potential along part of a neuron?

Why does the relative refractory period occur after the action potential is complete?

Match the ions, labelled a. through d., with their various roles. (Options may be used more than once or not at all.) a.Na⁺ b.K⁺ c.A^- d.Cl^- -ion that is actively transported into the cell

Which of these substances is most likely to passively diffuse across the plasma membrane by dissolving in the membrane?

The cells of excitable and nonexcitable tissues share which one of these properties?

Introduction to Physiology and Homeostasis

The Plasma Membrane and Membrane Potential

Principles of Neural and Hormonal Communication

The Central Nervous System

The Peripheral Nervous System: Afferent Division; Special Senses

The Peripheral Nervous System: Efferent Division

Muscle Physiology

Cardiac Physiology

The Blood Vessels and Blood Pressure

The Blood

Body Defenses

The Respiratory System

The Urinary System

Fluid and Acidbase Balance

The Digestive System

Energy Balance and Temperature Regulation

Filters

Exam 2: Cell Physiology

The three major subdivisions of a cell are the ____________________, the ____________________, and the ____________________.

Most of the membrane potential of the plasma membrane is established by the active transport of sodium and potassium ions.

Sheets of epithelial cells are joined by gap junctions.

What is cystic fibrosis caused by?

Axons can range in length from less than a millimetre to over one ____________________.

If red blood cells are placed in a ____________________ solution, water leaves the cells, causing them to crenate.

____________________ refers to a separation of opposite charges across the membrane.

At ____________________ potential, typically around -55 mV, rapid depolarization occurs.

Which of the following statements concerning gap junctions is NOT correct?

Which of the following is the correct statement about passive diffusion?

Match the ions, labelled a. through d., with their various roles. (Options may be used more than once or not at all.) a.Na+ b.K+ c.A- d.Cl- -ion whose equilibrium potential is opposite in charge of the resting membrane potential

Which of the following statements concerning the plasma membrane is correct?

Which of the following can be found within the nucleus?

Because a solution of lower solute concentration has a higher concentration of water, it exerts a lower osmotic pressure than does a solution with a higher solute concentration.

Which of the following is the normal direction for the movement of an action potential along part of a neuron?

Why does the relative refractory period occur after the action potential is complete?

Match the ions, labelled a. through d., with their various roles. (Options may be used more than once or not at all.) a.Na+ b.K+ c.A- d.Cl- -ion that is actively transported into the cell

Which of these substances is most likely to passively diffuse across the plasma membrane by dissolving in the membrane?

The cells of excitable and nonexcitable tissues share which one of these properties?

Introduction to Physiology and Homeostasis

The Plasma Membrane and Membrane Potential

Principles of Neural and Hormonal Communication

The Central Nervous System

The Peripheral Nervous System: Afferent Division; Special Senses

The Peripheral Nervous System: Efferent Division

Muscle Physiology

Cardiac Physiology

The Blood Vessels and Blood Pressure

The Blood

Body Defenses

The Respiratory System

The Urinary System

Fluid and Acidbase Balance

The Digestive System

Energy Balance and Temperature Regulation

Filters

The three major subdivisions of a cell are the , the , and the .

Match the ions, labelled a. through d., with their various roles. (Options may be used more than once or not at all.) a.Na⁺ b.K⁺ c.A^- d.Cl^- -ion whose equilibrium potential is opposite in charge of the resting membrane potential

Match the ions, labelled a. through d., with their various roles. (Options may be used more than once or not at all.) a.Na⁺ b.K⁺ c.A^- d.Cl^- -ion that is actively transported into the cell