Alexandra Bozan
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Study Guide: Muscle Contraction

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Alexandra Bozan
Created by Alexandra Bozan about 7 years ago
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Study Guide: Muscle Contraction

Question 1 of 46

1

Which of the following is not a general function of muscle tissue?

Select one of the following:

  • movement

  • protection

  • heat production

  • posture

Explanation

Question 2 of 46

1

The skeletal muscle fiber characteristic of excitability directly results in these cells being capable of

Select one of the following:

  • responding to nerve signals

  • shortening

  • returning to resting length after contracting

  • producing heat

Explanation

Question 3 of 46

1

The correct order of arrangement of skeletal muscle cells, from largest to smallest is

Select one of the following:

  • fiber, myofibril, myofilament

  • myofibril, myofilament, fiber

  • myofilament, myofibril, fiber

  • fiber, myofilament, myofibril

Explanation

Question 4 of 46

1

Sarcoplasmic reticulum is

Select one of the following:

  • a system of transverse tubules that extend at a right angle to the long axis of the cell

  • a segment of the myofibril between two successive Z lines

  • a unique name for the plasma membrane of a muscle fiber

  • none of the above

Explanation

Question 5 of 46

1

Which of the following are myofilament proteins?

Select one or more of the following:

  • troponin

  • tropomyosin

  • myosin

Explanation

Question 6 of 46

1

The contractile unit of a myofibril is the

Select one of the following:

  • sarcomere

  • triad

  • sarcolemma

  • cross-bridge

Explanation

Question 7 of 46

1

The chief function of the T tubule is to

Select one of the following:

  • provide nutrients to the muscle fiber

  • allow the fiber to contract

  • allow the electrical signal to move deep into the cell

  • allow the generation of new muscle fibers

Explanation

Question 8 of 46

1

Myosin heads are also called

Select one of the following:

  • cross-bridges

  • motor endplates

  • synapses

  • motor neurons

Explanation

Question 9 of 46

1

During muscle contraction, Ca++ is released from the

Select one of the following:

  • synapse cleft

  • mitochondria

  • sarcoplasmic reticulum

  • sarcoplasm

Explanation

Question 10 of 46

1

The region of a muscle fiber where a motor neuron connects to the muscle fiber is called the

Select one of the following:

  • synaptic vesicle

  • motor endplate

  • H band

  • none of the above

Explanation

Question 11 of 46

1

The thick myofilaments is made up of myosin.

Select one of the following:

  • True
  • False

Explanation

Question 12 of 46

1

Skeletal muscle has a poor ability to stretch.

Select one of the following:

  • True
  • False

Explanation

Question 13 of 46

1

A T tubule sandwiched between sacs of sarcoplasmic reticulum is called a codon.

Select one of the following:

  • True
  • False

Explanation

Question 14 of 46

1

Actin, troponin, and trop0myosin are present on the thin myofilament.

Select one of the following:

  • True
  • False

Explanation

Question 15 of 46

1

The I band resides within a single sarcomere.

Select one of the following:

  • True
  • False

Explanation

Question 16 of 46

1

Rigor mortis is caused by a lack of ATP to "turn off" muscle contraction.

Select one of the following:

  • True
  • False

Explanation

Question 17 of 46

1

The cell membrane of a muscle fiber is called the sarcoplasmic reticulum.

Select one of the following:

  • True
  • False

Explanation

Question 18 of 46

1

Anaerobic respiration is the first choice of the muscle cell for the production of ATP.

Select one of the following:

  • True
  • False

Explanation

Question 19 of 46

1

During rest, excess oxygen molecules in the sarcoplasm are attracted to a large protein molecule called myoglobin.

Select one of the following:

  • True
  • False

Explanation

Question 20 of 46

1

Anaerobic respiration results in the formation of an incompletely catabolized molecule called lactic acid.

Select one of the following:

  • True
  • False

Explanation

Question 21 of 46

1

The principal component(s) of a motor unit is/are:

Select one of the following:

  • a. one somatic motor neuron

  • b. the muscle fibers supplied by a somatic motor neuron

  • c. none of the above

  • d. both a and b

Explanation

Question 22 of 46

1

The staircase phenomenon is also known as

Select one of the following:

  • tetanus

  • electromyography

  • wave summation

  • treppe

Explanation

Question 23 of 46

1

Skeletal muscles are innervated by

Select one of the following:

  • a. somatic motor neurons

  • b. autonomic motor neurons

  • c. both a and b

  • d. internal stimulation

Explanation

Question 24 of 46

1

Which of the following statements concerning isometric contractions is true?

Select one of the following:

  • The length of the muscle changes

  • Muscle tension decreases

  • Joint movements are swift

  • Muscle length remain constant

Explanation

Question 25 of 46

1

Physiologic muscle fatigue is caused by

Select one of the following:

  • relative lack of ATP

  • oxygen debt

  • lack of will

  • none of the above

Explanation

Question 26 of 46

1

Increase in muscle size is called

Select one of the following:

  • hyperplasia

  • atrophy

  • hypertrophy

  • treppe

Explanation

Question 27 of 46

1

Endurance training is also called

Select one of the following:

  • isometrics

  • hypertrophy

  • aerobic training

  • anaerobic training

Explanation

Question 28 of 46

1

A muscle contracts the instant it is stimulated.

Select one of the following:

  • True
  • False

Explanation

Question 29 of 46

1

Isotonic contraction is one in which the tone or tension within a muscle remains the same, but the length of the muscle changes.

Select one of the following:

  • True
  • False

Explanation

Question 30 of 46

1

One method of studying muscle contraction is called myography.

Select one of the following:

  • True
  • False

Explanation

Question 31 of 46

1

Muscles with more tone than normal are described as flaccid.

Select one of the following:

  • True
  • False

Explanation

Question 32 of 46

1

cardiac muscle tissue: , , ,
skeletal muscle tissue: , , , ,
smooth muscle tissue: , , ,

Drag and drop to complete the text.

    contains a single nucleus
    intercalated disks
    large-diameter T tubules forming diads
    striated
    contains many nuclei near the sarcolemma
    heat production
    movement of bones
    posture
    voluntary
    located in the walls of hollow organs
    loosely organized SR
    not striated
    peristalsis

Explanation

Question 33 of 46

1

When a muscle does not shorten and no movement results, the contraction is

Select one of the following:

  • isometric

  • isotonic

  • twitch

  • tetanic

Explanation

Question 34 of 46

1

Pushing against a wall is an example of which type of contraction?

Select one of the following:

  • isotonic

  • isometric

  • twitch

  • tetanic

Explanation

Question 35 of 46

1

Prolonged inactivity causes muscles to shrink in mass, a condition called

Select one of the following:

  • hypertrophy

  • disuse atrophy

  • paralysis

  • muscle fatigue

Explanation

Question 36 of 46

1

Which statements is true of smooth muscle?

Select one of the following:

  • It lines the walls of many hollow organs

  • It is striated

  • It is voluntary

  • There are many T tubules throughout smooth muscle

Explanation

Question 37 of 46

1

What is a quick, jerky response of a given muscle to a single stimulus called?

Select one of the following:

  • isometric

  • lockjaw

  • tetanus

  • twitch

Explanation

Question 38 of 46

1

The energy repaired for muscular contraction is obtained by hydrolysis of amino acids.

Select one of the following:

  • True
  • False

Explanation

Question 39 of 46

1

A motor neuron together with the cells it innervates is called a motor unit.

Select one of the following:

  • True
  • False

Explanation

Question 40 of 46

1

If muscle cells are stimulated repeatedly without adequate periods of rest, the strength of the muscle contraction will decrease resulting in fatigue.

Select one of the following:

  • True
  • False

Explanation

Question 41 of 46

1

The minimum level of stimulation required to cause a fiber to contract is called the threshold stimulus.

Select one of the following:

  • True
  • False

Explanation

Question 42 of 46

1

Weakness of abdominal muscles can lead to a hernia.

Select one of the following:

  • True
  • False

Explanation

Question 43 of 46

1

There are two types of smooth muscle visceral and multiunit.

Select one of the following:

  • True
  • False

Explanation

Question 44 of 46

1

Cardiac muscle is also known as striated involuntary.

Select one of the following:

  • True
  • False

Explanation

Question 45 of 46

1

The length/tension relationship states that the maximal strength a muscle can develop is related to the length of the fibers.

Select one of the following:

  • True
  • False

Explanation

Question 46 of 46

1

Skeletal muscles have little effect on body temperature.

Select one of the following:

  • True
  • False

Explanation

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