Question 1

Match from the following list.
-The band with the most overlap between thick and thin filaments,which unevenly scatters light leading to its' dark appearance.

Accepted Answer

A) A band 
B) I band 
C) Z disk 
D) H zone 
E) M line 
A) A band 
B) I band 
C) Z disk 
D) H zone 
E) M line

Question 2

Put these events in the correct chronological sequence:
1)End-plate potentials trigger action potentials.
2)Transverse tubules convey potentials into the interior of the cell.
3)Acetylcholine binds to receptors on the motor end plate.
4)Ca2+ is released from the sarcoplasmic reticulum.

Accepted Answer

A)  1, 2, 3, 4 
B)  3, 1, 2, 4 
C)  2, 1, 4, 3 
D)  3, 1, 4, 2 
E)  4, 3, 2, 1 
A)  1, 2, 3, 4 
B)  3, 1, 2, 4 
C)  2, 1, 4, 3 
D)  3, 1, 4, 2 
E)  4, 3, 2, 1

Question 3

Calcium,released by the sarcoplasmic reticulum,binds to ________ to move the ________,which allows actin to form of a ________ with myosin.

Accepted Answer

troponin C

Question 4

In comparison to skeletal muscle,smooth muscle cells function over a ________ range of muscle lengths and exhibit a speed of contraction that is ________ than skeletal muscle.

Accepted Answer

The answer of In comparison to skeletal muscle,smooth muscle cells...

Question 5

Match the structures with the accurate description.
-inward extensions of the muscle cell membrane

Accepted Answer

A) muscle fiber 
B) fascicle 
C) sarcolemma 
D) myofibril 
E) t-tubules 
A) muscle fiber 
B) fascicle 
C) sarcolemma 
D) myofibril 
E) t-tubules

Question 6

In smooth muscle cells,Ca2+ binds to ________ which activates the enzyme ________ to phosphorylate myosin and increase force.

Accepted Answer

calmodulin

Question 7

As ATP binds to the myosin head at the beginning of a muscle contraction cycle,the myosin head immediately

Accepted Answer

A)  detaches from actin. 
B)  initiates binding with actin. 
C)  tightens its bond to actin. 
D)  swivels. 
A)  detaches from actin. 
B)  initiates binding with actin. 
C)  tightens its bond to actin. 
D)  swivels.

Question 8

________ and ________ are striated muscles.Why are these muscles classified as striated muscles?

Accepted Answer

Skeletal,cardiac mus

Question 9

The H zone contains

Accepted Answer

A)  thick filaments. 
B)  thin filaments only. 
C)  actin only. 
D)  thick and thin filaments. 
A)  thick filaments. 
B)  thin filaments only. 
C)  actin only. 
D)  thick and thin filaments.

Question 10

An important difference between single-unit and multiunit smooth muscle is the

Accepted Answer

A)  numerous gap junctions in single-unit smooth muscle, which allow many cells to work together as a sheet. 
B)  longer actin and myosin filaments in multiunit smooth muscle, which allow coordination of contraction. 
C)  ability of single-unit fibers to change into multiunit fibers when advantageous. 
D)  closely controlled individual fibers in single-unit smooth muscle to allow fine control and graded contractions by selective activation. 
A)  numerous gap junctions in single-unit smooth muscle, which allow many cells to work together as a sheet. 
B)  longer actin and myosin filaments in multiunit smooth muscle, which allow coordination of contraction. 
C)  ability of single-unit fibers to change into multiunit fibers when advantageous. 
D)  closely controlled individual fibers in single-unit smooth muscle to allow fine control and graded contractions by selective activation.

Question 11

Skeletal muscle fibers with the greatest endurance rely on ________ for energy.

Accepted Answer

A)  anaerobic glycolysis 
B)  oxidative phosphorylation 
C)  lactic acid accumulation 
D)  ketone body degradation 
A)  anaerobic glycolysis 
B)  oxidative phosphorylation 
C)  lactic acid accumulation 
D)  ketone body degradation

Question 12

The binding of acetylcholine to its receptor at the neuromuscular junction causes the opening of a

Accepted Answer

A)  Na+ channel. 
B)  channel for both Na+ and K+. 
C)  calcium channel. 
D)  ryanodine receptor. 
A)  Na+ channel. 
B)  channel for both Na+ and K+. 
C)  calcium channel. 
D)  ryanodine receptor.

Question 13

In fast-twitch oxidative-glycolytic fibers,their rapid increases in force rely on the ________ activity where rapid relaxation requires ________ activity.

Accepted Answer

myosin ATP

Question 14

When a skeletal muscle generates enough force during contraction to shorten,

Accepted Answer

A)  only the sarcomere will shorten. 
B)  only the A band will shorten. 
C)  only the I band will shorten. 
D)  the sarcomere and the I band will shorten. 
E)  the sarcomere, the A band and the I band will shorten. 
A)  only the sarcomere will shorten. 
B)  only the A band will shorten. 
C)  only the I band will shorten. 
D)  the sarcomere and the I band will shorten. 
E)  the sarcomere, the A band and the I band will shorten.

Question 15

Which of the following is NOT a property of single-unit smooth muscles?

Accepted Answer

A)  All smooth muscle cells are connected by gap junctions. 
B)  Their contraction occurs in a coordinated manner. 
C)  Electrical responses travel directly between cells. 
D)  Only a proportion of the smooth muscle cells receive autonomic nervous input. 
E)  Each cell functions independent of its neighbor. 
A)  All smooth muscle cells are connected by gap junctions. 
B)  Their contraction occurs in a coordinated manner. 
C)  Electrical responses travel directly between cells. 
D)  Only a proportion of the smooth muscle cells receive autonomic nervous input. 
E)  Each cell functions independent of its neighbor.

Question 16

The T-tubular membrane contains ________ receptors that are ________ and therefore respond to action potentials.This receptor is mechanically linked to ________ receptors in the adjacent sarcoplasmic reticulum.

Accepted Answer

dihydropyridine (DHP)or L-type

Question 17

The origin is the end of the skeletal muscle that attaches to the

Accepted Answer

A)  more stationary bone. 
B)  more mobile bone. 
C)  tendon. 
D)  ligament. 
A)  more stationary bone. 
B)  more mobile bone. 
C)  tendon. 
D)  ligament.

Question 18

The cause of skeletal muscle fatigue during extended submaximal exercise is primarily a(n)

Accepted Answer

A)  depletion of glycogen stores. 
B)  depletion of creatine stores. 
C)  increased inorganic phosphate (Pi) concentration. 
D)  depletion of K+ stores. 
A)  depletion of glycogen stores. 
B)  depletion of creatine stores. 
C)  increased inorganic phosphate (Pi) concentration. 
D)  depletion of K+ stores.

Question 19

Put these myofibers in the order they would be recruited as the body moves from a weak to a strong stimulus:
1)glycolytic fast-twitch fibers
2)fatigue-resistant oxidative fast-twitch fibers
3)fatigue-resistant slow-twitch fibers

Accepted Answer

A)  1, 2, 3 
B)  2, 3, 1 
C)  3, 2, 1 
D)  1, 3, 2 
E)  3, 1, 2 
A)  1, 2, 3 
B)  2, 3, 1 
C)  3, 2, 1 
D)  1, 3, 2 
E)  3, 1, 2

Question 20

After death,when metabolism stops,in which step of the contractile cycle must skeletal muscles remain?

Accepted Answer

A)  It depends on what part of the contractile cycle they were in at the time of death. 
B)  the power stoke phase 
C)  the rigor state 
D)  a weak binding state 
A)  It depends on what part of the contractile cycle they were in at the time of death. 
B)  the power stoke phase 
C)  the rigor state 
D)  a weak binding state

Exam 12: Muscles

Match from the following list. -The band with the most overlap between thick and thin filaments,which unevenly scatters light leading to its' dark appearance.

Put these events in the correct chronological sequence: 1)End-plate potentials trigger action potentials. 2)Transverse tubules convey potentials into the interior of the cell. 3)Acetylcholine binds to receptors on the motor end plate. 4)Ca2+ is released from the sarcoplasmic reticulum.

Calcium,released by the sarcoplasmic reticulum,binds to ________ to move the ________,which allows actin to form of a ________ with myosin.

In comparison to skeletal muscle,smooth muscle cells function over a ________ range of muscle lengths and exhibit a speed of contraction that is ________ than skeletal muscle.

Match the structures with the accurate description. -inward extensions of the muscle cell membrane

In smooth muscle cells,Ca2+ binds to ________ which activates the enzyme ________ to phosphorylate myosin and increase force.

As ATP binds to the myosin head at the beginning of a muscle contraction cycle,the myosin head immediately

________ and ________ are striated muscles.Why are these muscles classified as striated muscles?

The H zone contains

An important difference between single-unit and multiunit smooth muscle is the

Skeletal muscle fibers with the greatest endurance rely on ________ for energy.

The binding of acetylcholine to its receptor at the neuromuscular junction causes the opening of a

In fast-twitch oxidative-glycolytic fibers,their rapid increases in force rely on the ________ activity where rapid relaxation requires ________ activity.

When a skeletal muscle generates enough force during contraction to shorten,

Which of the following is NOT a property of single-unit smooth muscles?

The T-tubular membrane contains ________ receptors that are ________ and therefore respond to action potentials.This receptor is mechanically linked to ________ receptors in the adjacent sarcoplasmic reticulum.

The origin is the end of the skeletal muscle that attaches to the

The cause of skeletal muscle fatigue during extended submaximal exercise is primarily a(n)

Put these myofibers in the order they would be recruited as the body moves from a weak to a strong stimulus: 1)glycolytic fast-twitch fibers 2)fatigue-resistant oxidative fast-twitch fibers 3)fatigue-resistant slow-twitch fibers

After death,when metabolism stops,in which step of the contractile cycle must skeletal muscles remain?

Introduction to Physiology

Molecular Interactions

Compartmentation: Cells and Tissues

Energy and Cellular Metabolism

Membrane Dynamics

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

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

Put these events in the correct chronological sequence: 1)End-plate potentials trigger action potentials. 2)Transverse tubules convey potentials into the interior of the cell. 3)Acetylcholine binds to receptors on the motor end plate. 4)Ca²⁺ is released from the sarcoplasmic reticulum.

Calcium,released by the sarcoplasmic reticulum,binds to to move the ,which allows actin to form of a with myosin.

In comparison to skeletal muscle,smooth muscle cells function over a range of muscle lengths and exhibit a speed of contraction that is than skeletal muscle.

In smooth muscle cells,Ca²⁺ binds to which activates the enzyme to phosphorylate myosin and increase force.

and are striated muscles.Why are these muscles classified as striated muscles?

In fast-twitch oxidative-glycolytic fibers,their rapid increases in force rely on the activity where rapid relaxation requires activity.

The T-tubular membrane contains receptors that are and therefore respond to action potentials.This receptor is mechanically linked to receptors in the adjacent sarcoplasmic reticulum.