Question 1

Match the membrane protein with its function.
-transporters

Accepted Answer

A) transfer signals from the extracellular environment to the cytoplasm of the cell 
B) form cell-to-cell connections 
C) bind to molecules to facilitate entry to or exit from the cell 
D) ligands bind to these proteins and are changed by the protein 
A) transfer signals from the extracellular environment to the cytoplasm of the cell 
B) form cell-to-cell connections 
C) bind to molecules to facilitate entry to or exit from the cell 
D) ligands bind to these proteins and are changed by the protein

Question 2

At rest,nerve cells have an unequal distribution of ions on either side of the cell membrane,producing the ________.

Accepted Answer

resting me

Question 3

Channel proteins that allow water to pass are called ________.

Accepted Answer

The answer of Channel proteins that allow water to pass...

Question 4

The three types of gated channels are ________,________,and ________.

Accepted Answer

chemically gated cha

Question 5

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 6

Passive transport refers to a process that requires

Accepted Answer

A)  no energy at all. 
B)  no cellular energy. 
C)  no pressure gradient. 
D)  no concentration gradient. 
E)  no electrical gradient. 
A)  no energy at all. 
B)  no cellular energy. 
C)  no pressure gradient. 
D)  no concentration gradient. 
E)  no electrical gradient.

Question 7

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.

Question 8

Cells of the intestine are very permeable to water while some cells of the kidney tubule are not at all permeable to water.Can you suggest some ways these two types of cells might be structurally different from each other?

Accepted Answer

Kidney cells may have fewer op

Question 9

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 10

You mix one liter of 300 mOsM NaCl with two liters 450 mOsM glucose.
A.What is the osmolarity of the new solution?
B.What is the final osmolarity of the NaCl in the new solution?
C.What is the final osmolarity of glucose in the new solution?
D.What is the tonicity of this new solution compared to a red blood cell with 300 mOsM nonpenetrating solute?

Accepted Answer

A.300 mOsM NaCl × 1 L = 300 mOsmoles NaC

Question 11

Substances that readily dissolve in water and do not readily dissolve in lipids are

Accepted Answer

A)  hydrophobic and lipophobic. 
B)  hydrophilic and lipophobic. 
C)  hydrophobic and lipophilic. 
D)  hydrophilic and lipophilic. 
A)  hydrophobic and lipophobic. 
B)  hydrophilic and lipophobic. 
C)  hydrophobic and lipophilic. 
D)  hydrophilic and lipophilic.

Question 12

A pump that helps maintain an electrical gradient,such as the Na+-K+-ATPase is a(n)________ pump.

Accepted Answer

Question 13

Evaluate the validity of this statement: "The extracellular and intracellular fluid compartments have a stable solute composition that is in equilibrium."

Accepted Answer

This statement is only partial

Question 14

The concentration of calcium inside a cell is 0.3%.The concentration of calcium outside the cell is 0.1%.How could the cell transport even more calcium to the inside?

Accepted Answer

A)  passive transport 
B)  active transport 
C)  osmosis 
D)  exocytosis 
E)  All of the answers are correct. 
A)  passive transport 
B)  active transport 
C)  osmosis 
D)  exocytosis 
E)  All of the answers are correct.

Question 15

The membrane proteins that provide for support of the cell membrane and allow for cells to connect to each other are ________.

Accepted Answer

The answer of The membrane proteins that provide for support...

Question 16

Design an experiment to test whether molecular weight does indeed influence the rate of diffusion.Be sure to list all controlled variables.

Accepted Answer

Answers will vary.Controlled variables m

Exam 5: Membrane Dynamics

Match the membrane protein with its function. -transporters

At rest,nerve cells have an unequal distribution of ions on either side of the cell membrane,producing the ________.

Channel proteins that allow water to pass are called ________.

The three types of gated channels are ________,________,and ________.

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

Passive transport refers to a process that requires

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

Cells of the intestine are very permeable to water while some cells of the kidney tubule are not at all permeable to water.Can you suggest some ways these two types of cells might be structurally different from each other?

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

Substances that readily dissolve in water and do not readily dissolve in lipids are

A pump that helps maintain an electrical gradient,such as the Na+-K+-ATPase is a(n)________ pump.

Evaluate the validity of this statement: "The extracellular and intracellular fluid compartments have a stable solute composition that is in equilibrium."

The concentration of calcium inside a cell is 0.3%.The concentration of calcium outside the cell is 0.1%.How could the cell transport even more calcium to the inside?

The membrane proteins that provide for support of the cell membrane and allow for cells to connect to each other are ________.

Design an experiment to test whether molecular weight does indeed influence the rate of diffusion.Be sure to list all controlled variables.

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

The three types of gated channels are ,,and .

A pump that helps maintain an electrical gradient,such as the Na⁺-K⁺-ATPase is a(n)________ pump.