Question 1

Active sites become exposed when calcium ions bind to ________.

Accepted Answer

The answer of Active sites become exposed when calcium ions...

Question 2

Decreased blood flow to a muscle could result in all of the following,except

Accepted Answer

A)  muscle fatigue.
B)  an oxygen debt.
C)  an increase in intracellular glycogen.
D)  a shift to anaerobic glycolysis.
E)  an increase in intracellular lactic acid.F) D) and E)
G) A) and D)

Question 3

Muscle fibers differ from "typical cells" in that muscle fibers

Accepted Answer

A)  lack a plasma membrane.
B)  have many nuclei.
C)  are very small.
D)  lack mitochondria.
E)  have large gaps in the cell membrane.F) C) and D)
G) A) and E)

Question 4

Heat energy produced from muscle contraction is released by the ________ system.

Accepted Answer

A)  integumentary
B)  respiratory
C)  cardiovascular
D)  urinary
E)  endocrineF) B) and D)
G) D) and E)

Question 5

Triggering of the muscle action potential occurs after

Accepted Answer

A)  acetylcholine binds to chemically-gated channels in the end plate membrane.
B)  acetylcholinesterase binds to receptors on the end plate.
C)  calcium ion binds to channels on the end plate.
D)  the nerve action potential jumps across the neuromuscular junction.
E)  Any of the above can produce an action potential in the muscle cell.F) None of the above
G) A) and B)

Question 6

The skeletal muscle complex known as the triad consists of

Accepted Answer

A)  actin,myosin,and filaments.
B)  a transverse tubule and two terminal cisternae.
C)  filaments,myofibrils,and sarcomeres.
D)  A bands,H bands,and I bands.
E)  actin,myosin,and sarcomeres.F) A) and D)
G) A) and C)

Question 7

The area in the center of the A band that contains no thin filaments is the

Accepted Answer

A)  Z line.
B)  M line.
C)  H band.
D)  I band.
E)  zone of overlap.F) B) and E)
G) C) and D)

Question 8

The following is a list of the events that occur during a muscle contraction. 1.Myosin cross-bridges bind to the actin.
2) The free myosin head splits ATP.
3) Calcium ion is released from the sarcoplasmic reticulum.
4) The myosin head pivots toward the center of the sarcomere.
5) Calcium ion binds to troponin.
6) The myosin head binds an ATP molecule and detaches from the actin.
The correct sequence of these events is

Accepted Answer

A)  1,3,5,4,6,2.
B)  5,1,4,6,2,3.
C)  3,5,1,2,4,6.
D)  3,5,1,4,6,2.
E)  1,4,6,2,3,5.F) None of the above
G) C) and E)

Question 9

The muscle weakness of myasthenia gravis results from

Accepted Answer

A)  insufficient acetylcholine release from presynaptic vesicles.
B)  loss of acetylcholine receptors in the end-plate membrane.
C)  the motor neuron action potential being too small to shock the muscle fibers.
D)  excessive acetylcholinesterase that destroys the neurotransmitter.
E)  inability of the muscle fiber to produce ATP.F) B) and E)
G) A) and E)

Question 10

Each skeletal muscle fiber contains ________ myofibrils.

Accepted Answer

A)  50 to 100
B)  100 to 150
C)  150 to 200
D)  200 to 500
E)  hundreds to thousandsF) B) and D)
G) A) and B)

Question 11

A fascicle is

Accepted Answer

A)  a group of muscle fibers that are encased in the perimysium.
B)  the belly of a muscle.
C)  a group of muscle fibers that are all part of the same motor unit.
D)  a group of muscle fibers and motor neurons.
E)  a collection of myofibrils in a muscle fiber.F) C) and E)
G) A) and C)

Question 12

The bundle of collagen fibers at the end of a skeletal muscle that attaches the muscle to bone is called a(n)

Accepted Answer

A)  fascicle.
B)  tendon.
C)  ligament.
D)  epimysium.
E)  myofibril.F) A) and C)
G) A) and B)

Question 13

The complex of a transverse tubule and two adjacent terminal cisternae is known as a ________.

Accepted Answer

The answer of The complex of a transverse tubule and...

Question 14

Figure 10-2 Muscle Contractions
Use Figure 10-2 to answer the following question:
-What is the contraction in graph (d) called?

Accepted Answer

A)  complete tetanus
B)  incomplete tetanus
C)  twitch
D)  wave summation
E)  treppeF) A) and B)
G) C) and E)

Question 15

Suppose that you try to pick up an object and discover that it is much heavier than you expected. Which process must occur in the muscle to increase tension so you can pick up the object?

Accepted Answer

A)  wave summation
B)  isotonic contraction
C)  complete tetanus
D)  recruitment
E)  treppeF) B) and C)
G) A) and C)

Exam 10: Muscle Tissue

Triggering of the muscle action potential occurs after

Correct Answer
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Decreased blood flow to a muscle could result in all of the following,except

Correct Answer
verified

The area in the center of the A band that contains no thin filaments is the

Correct Answer
verified

Each skeletal muscle fiber contains ________ myofibrils.

Correct Answer
verified

The complex of a transverse tubule and two adjacent terminal cisternae is known as a ________.

Correct Answer
verified

The muscle weakness of myasthenia gravis results from

Correct Answer
verified

The bundle of collagen fibers at the end of a skeletal muscle that attaches the muscle to bone is called a(n)

Correct Answer
verified

Active sites become exposed when calcium ions bind to ________.

Correct Answer
verified

Muscle fibers differ from "typical cells" in that muscle fibers

Correct Answer
verified

Suppose that you try to pick up an object and discover that it is much heavier than you expected. Which process must occur in the muscle to increase tension so you can pick up the object?

Correct Answer
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A fascicle is

Correct Answer
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The skeletal muscle complex known as the triad consists of

Correct Answer
verified

Figure 10-2 Muscle Contractions Use Figure 10-2 to answer the following question: -What is the contraction in graph (d) called?

Correct Answer
verified

Heat energy produced from muscle contraction is released by the ________ system.

Correct Answer
verified

Exam 10: Muscle Tissue

Triggering of the muscle action potential occurs after

Correct AnswerverifiedShow Answer

Decreased blood flow to a muscle could result in all of the following,except

Correct AnswerverifiedShow Answer

The area in the center of the A band that contains no thin filaments is the

Correct AnswerverifiedShow Answer

Each skeletal muscle fiber contains ________ myofibrils.

Correct AnswerverifiedShow Answer

The complex of a transverse tubule and two adjacent terminal cisternae is known as a ________.

Correct AnswerverifiedShow Answer

The muscle weakness of myasthenia gravis results from

Correct AnswerverifiedShow Answer

The bundle of collagen fibers at the end of a skeletal muscle that attaches the muscle to bone is called a(n)

Correct AnswerverifiedShow Answer

Active sites become exposed when calcium ions bind to ________.

Correct AnswerverifiedShow Answer

Muscle fibers differ from "typical cells" in that muscle fibers

Correct AnswerverifiedShow Answer

Suppose that you try to pick up an object and discover that it is much heavier than you expected. Which process must occur in the muscle to increase tension so you can pick up the object?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A fascicle is

Correct AnswerverifiedShow Answer

The skeletal muscle complex known as the triad consists of

Correct AnswerverifiedShow Answer

Figure 10-2 Muscle Contractions Use Figure 10-2 to answer the following question: -What is the contraction in graph (d) called?

Correct AnswerverifiedShow Answer

Heat energy produced from muscle contraction is released by the ________ system.

Correct AnswerverifiedShow Answer

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