Question 1

One of the reasons you might struggle to lift a heavy object with your arm fully extended is because

Accepted Answer

A)  in extension,the proximity of Z discs to thick filaments restricts the sliding movement within sarcomeres.
B)  full extension results in decreased overlap between thick and thin filaments in the muscle.
C)  in that posture,some myosin heads overlap actin in the wrong orientation and tug actin in the wrong direction.
D)  motor neurons cannot release as much ACh in that posture.

Question 2

Growth of the uterus during pregnancy is accomplished by _________ of its smooth muscle.

Accepted Answer

A)  neither hypertrophy nor hyperplasia
B)  both hypertrophy and hyperplasia
C)  hypertrophy but not hyperplasia
D)  hyperplasia but not hypertrophy

Question 3

Fibers from one motor unit

Accepted Answer

A)  are clustered together within one fascicle of the muscle.
B)  are dispersed throughout most of the muscle.

Question 4

In general,a skeletal muscle is composed of
A: connective tissue sheaths
B: nerves
C: arteries
D: veins
E: muscle fibers

Accepted Answer

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

Question 5

Muscle tone is a result of _________ nervous system activity,and it acts to _________ joint position.

Accepted Answer

A)  involuntary,stabilize
B)  involuntary,continuously vary
C)  voluntary,stabilize
D)  voluntary,continuously vary

Question 6

The T-tubules and sarcoplasmic reticulum are unique to muscle fibers.

Accepted Answer

A) True 
 B)False

Question 7

A motor unit consists of

Accepted Answer

A)  multiple motor neurons and multiple muscle fibers.
B)  a single motor neuron and the multiple muscle fibers it controls.
C)  multiple motor neurons and the one muscle fiber they control.
D)  one synaptic terminal button,a cleft,and an acetylcholine receptor.
E)  an end plate,a T-tubule,and sarcoplasmic reticulum.

Question 8

Acetylcholine exerts its effect by

Accepted Answer

A)  stimulating the motor neuron's synaptic knob.
B)  binding to receptors at the motor end plate.
C)  activating acetylcholinesterase.
D)  allowing calcium to enter the cell.

Question 9

The top long-distance runners probably have _______ proportion of slow muscle fibers in their leg muscles.

Accepted Answer

A)  a higher
B)  a lower
C)  the same

Question 10

Each skeletal muscle is composed of _____________,which are bundles of muscle fibers.

Accepted Answer

The answer of Each skeletal muscle is composed of _____________,which...

Question 11

Glycolysis is an

Accepted Answer

A)  aerobic process that occurs in the cytosol.
B)  aerobic process that occurs in the mitochondria.
C)  anaerobic process that occurs in the cytosol.
D)  anaerobic process that occurs in the mitochondria.

Question 12

The net energy yield from one glucose molecule through the process of glycolysis is

Accepted Answer

A)  2 ATP.
B)  6 ATP.
C)  30 ATP.
D)  36 ATP.

Question 13

The contraction phase of a muscle twitch has a shorter duration than the relaxation phase.

Accepted Answer

A) True 
 B)False

Question 14

The floor of the pelvic cavity includes skeletal muscles that function to support organs in that cavity.

Accepted Answer

A) True 
 B)False

Question 15

The membranous network that wraps around myofibrils and holds relatively high concentrations of calcium is known as the

Accepted Answer

A)  sarcolemma.
B)  T-tubule.
C)  sarcoplasmic reticulum.
D)  sarcomere.
E)  Golgi body.

Question 16

A subthreshold stimulus evokes only a small muscle twitch instead of a full tetanic contraction.

Accepted Answer

A) True 
 B)False

Question 17

The junction between an axon and the muscle fiber itself is called a _____________ junction.

Accepted Answer

The answer of The junction between an axon and the...

Question 18

The electron transport system refers to oxidative phophorylation using the coenzymes FADH2and _______.

Accepted Answer

Question 19

Glycolytic muscle fibers tend to be very rich in myoglobin and mitochondria.

Accepted Answer

A) True 
 B)False

Question 20

When a skeletal muscle fiber is at rest,there is more sodium outside the cell as compared to the sarcoplasm.

Accepted Answer

A) True 
 B)False

Exam 10: Muscle Tissue

Growth of the uterus during pregnancy is accomplished by _________ of its smooth muscle.

Correct AnswerverifiedShow Answer

In general,a skeletal muscle is composed of A: connective tissue sheaths B: nerves C: arteries D: veins E: muscle fibers

Correct AnswerverifiedShow Answer

The electron transport system refers to oxidative phophorylation using the coenzymes FADH2and _______.

Correct AnswerverifiedShow Answer

The membranous network that wraps around myofibrils and holds relatively high concentrations of calcium is known as the

Correct AnswerverifiedShow Answer

The junction between an axon and the muscle fiber itself is called a _____________ junction.

Correct AnswerverifiedShow Answer

Fibers from one motor unit

Correct AnswerverifiedShow Answer

Each skeletal muscle is composed of _____________,which are bundles of muscle fibers.

Correct AnswerverifiedShow Answer

The top long-distance runners probably have _______ proportion of slow muscle fibers in their leg muscles.

Correct AnswerverifiedShow Answer

When a skeletal muscle fiber is at rest,there is more sodium outside the cell as compared to the sarcoplasm.

Correct AnswerverifiedShow Answer

The contraction phase of a muscle twitch has a shorter duration than the relaxation phase.

Correct AnswerverifiedShow Answer

The net energy yield from one glucose molecule through the process of glycolysis is

Correct AnswerverifiedShow Answer

One of the reasons you might struggle to lift a heavy object with your arm fully extended is because

Correct AnswerverifiedShow Answer

The T-tubules and sarcoplasmic reticulum are unique to muscle fibers.

Correct AnswerverifiedShow Answer

A subthreshold stimulus evokes only a small muscle twitch instead of a full tetanic contraction.

Correct AnswerverifiedShow Answer

The floor of the pelvic cavity includes skeletal muscles that function to support organs in that cavity.

Correct AnswerverifiedShow Answer

Muscle tone is a result of _________ nervous system activity,and it acts to _________ joint position.

Correct AnswerverifiedShow Answer

Acetylcholine exerts its effect by

Correct AnswerverifiedShow Answer

Glycolytic muscle fibers tend to be very rich in myoglobin and mitochondria.

Correct AnswerverifiedShow Answer

Glycolysis is an

Correct AnswerverifiedShow Answer

A motor unit consists of

Correct AnswerverifiedShow Answer

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The electron transport system refers to oxidative phophorylation using the coenzymes FADH₂and _______.

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Muscle tone is a result of _ nervous system activity,and it acts to _ joint position.

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