Question 1

The functional contractile unit of a skeletal muscle fiber is called a _______________.

Accepted Answer

The answer of The functional contractile unit of a skeletal...

Question 2

The increase in muscle tension that occurs with an increase in the intensity (voltage) of a stimulus is called

Accepted Answer

A)  recruitment.
B)  treppe.
C)  wave summation.
D)  incomplete tetany. A

Question 3

A reduced ability to generate tension due to recent exertion of force is known as muscle ________.

Accepted Answer

The answer of A reduced ability to generate tension due...

Question 4

-This sarcomere depicts relaxed muscle.What does number 1 refer to

Accepted Answer

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

Question 5

The multiple nuclei in skeletal muscle cells are the result of the

Accepted Answer

A)  fusion of myoblasts.
B)  cytokinesis of embryonic satellite cells.
C)  spontaneous development of nuclei in embryonic cells.
D)  stimulation of fibroblasts by hormones.
E)  action of testosterone on mesenchyme cell.

Question 6

During muscle contraction,myosin heads attach to actin and thereby form connections called ______________.

Accepted Answer

The answer of During muscle contraction,myosin heads attach to actin...

Question 7

A continuous,smooth contraction of muscle in which twitches are fully fused is referred to as _________.

Accepted Answer

The answer of A continuous,smooth contraction of muscle in which...

Question 8

A power stroke involves

Accepted Answer

A)  an actin molecule pulling a myosin molecule toward the M-line.
B)  a thin filament shortening in length and thereby shortening the sarcomere.
C)  a myosin head pulling a thin filament toward the center of the sarcomere.
D)  a thick filament pushing an actin filament towards the nearest Z-line.

Question 9

Each thick filament contains about ______ protein molecules (each molecule has two heads and two braided tails) .

Accepted Answer

A)  2
B)  20
C)  200
D)  2000

Question 10

Similar to skeletal muscle cells,all smooth muscle cells are excited by ACh.

Accepted Answer

A) True 
 B)False

Question 11

One of the names for the areolar connective tissue and adipose connective tissue that separates muscle from skin is ______________ fascia.

Accepted Answer

The answer of One of the names for the areolar...

Question 12

Which sequence correctly lists the changes that allow the thick and thin filaments to slide past one another in skeletal muscle contraction

Accepted Answer

A)  Attach - pivot - detach - return
B)  Pivot - attach - return - detach
C)  Attach - detach - pivot - return
D)  Return - pivot - attach - detach
E)  Pivot - attach - detach - return

Question 13

Rather than tightly coupled synapses between neurons and muscle cells,single-unit smooth muscle contains

Accepted Answer

A)  gap junctions that connect neurons to smooth muscle cells.
B)  varicosities of a subset of muscle fibers so that individual cells can be separately stimulated.
C)  diffuse junctions where neuron varicosities are responsible for neurotransmitter release.
D)  plaques and caveolae that contain multiple hormone receptors for discrete endocrine control.

Question 14

During skeletal muscle fiber contraction,the I bands and H zones narrow.

Accepted Answer

A) True 
 B)False

Question 15

Events of excitation contraction coupling,such as the release of calcium from intracellular stores,occur during the ________ period of a muscle twitch.

Accepted Answer

A)  relaxation
B)  contraction
C)  latent C

Question 16

Slow-twitch fibers are specialized to continue contracting for extended periods of time without experiencing fatigue.

Accepted Answer

A) True 
 B)False

Question 17

Which is a correct listing of the hierarchy of a skeletal muscle's components,beginning with the smallest
A: Myofibrils
B: Muscle fiber
C: Fascicle
D: Skeletal muscle

Accepted Answer

A)  a,b,c,d
B)  a,c,b,d
C)  d,c,b,a
D)  c,b,a,d
E)  b,c,a,d A

Question 18

The metabolic reactions within fast-twitch fibers derive much of their energy from aerobic respiration.

Accepted Answer

A) True 
 B)False

Question 19

A graph of a muscle twitch contains three periods.The period during which there is no change in external muscle tension (and no change in muscle length)is the ________ period.

Accepted Answer

The answer of A graph of a muscle twitch contains...

Question 20

The most abundant form of smooth muscle is

Accepted Answer

A)  single-unit,which is also known as visceral smooth muscle.
B)  cardiac muscle,which is also known as visceral smooth muscle.
C)  multiunit,which is also known as visceral smooth muscle.
D)  multiunit,which is also known as varicose muscle.
E)  single-unit,which is also known as somatic nervous system muscle.

Exam 10: Muscle Tissue

The functional contractile unit of a skeletal muscle fiber is called a _______________.

Correct AnswerverifiedShow Answer

The increase in muscle tension that occurs with an increase in the intensity (voltage) of a stimulus is called

Correct AnswerverifiedA

A reduced ability to generate tension due to recent exertion of force is known as muscle ________.

Correct AnswerverifiedShow Answer

-This sarcomere depicts relaxed muscle.What does number 1 refer to

Correct AnswerverifiedShow Answer

The multiple nuclei in skeletal muscle cells are the result of the

Correct AnswerverifiedShow Answer

During muscle contraction,myosin heads attach to actin and thereby form connections called ______________.

Correct AnswerverifiedShow Answer

A continuous,smooth contraction of muscle in which twitches are fully fused is referred to as _________.

Correct AnswerverifiedShow Answer

A power stroke involves

Correct AnswerverifiedShow Answer

Each thick filament contains about ______ protein molecules (each molecule has two heads and two braided tails) .

Correct AnswerverifiedShow Answer

Similar to skeletal muscle cells,all smooth muscle cells are excited by ACh.

Correct AnswerverifiedShow Answer

One of the names for the areolar connective tissue and adipose connective tissue that separates muscle from skin is ______________ fascia.

Correct AnswerverifiedShow Answer

Which sequence correctly lists the changes that allow the thick and thin filaments to slide past one another in skeletal muscle contraction

Correct AnswerverifiedShow Answer

Rather than tightly coupled synapses between neurons and muscle cells,single-unit smooth muscle contains

Correct AnswerverifiedShow Answer

During skeletal muscle fiber contraction,the I bands and H zones narrow.

Correct AnswerverifiedShow Answer

Events of excitation contraction coupling,such as the release of calcium from intracellular stores,occur during the ________ period of a muscle twitch.

Correct AnswerverifiedC

Slow-twitch fibers are specialized to continue contracting for extended periods of time without experiencing fatigue.

Correct AnswerverifiedShow Answer

Which is a correct listing of the hierarchy of a skeletal muscle's components,beginning with the smallest A: Myofibrils B: Muscle fiber C: Fascicle D: Skeletal muscle

Correct AnswerverifiedA

The metabolic reactions within fast-twitch fibers derive much of their energy from aerobic respiration.

Correct AnswerverifiedShow Answer

A graph of a muscle twitch contains three periods.The period during which there is no change in external muscle tension (and no change in muscle length)is the ________ period.

Correct AnswerverifiedShow Answer

The most abundant form of smooth muscle is

Correct AnswerverifiedShow Answer

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