Mer Scott
Quiz by , created more than 1 year ago

• Compare and contrast structural and functional differences between skeletal, cardiac and smooth muscle.

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Mer Scott
Created by Mer Scott about 7 years ago
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L27 Cardiac and Smooth Muscle: Comparison of Functional Differences

Question 1 of 18

1

muscle is for movement, posture, and heat. muscle is for pumping . muscle is for moving and has specific functions.

Drag and drop to complete the text.

    Skeletal
    Cardiac
    blood
    Smooth
    contents of the viscera

Explanation

Question 2 of 18

1

Which of these descriptions matches skeletal muscle?

Select one of the following:

  • Voluntary and specific

  • Continuous, involuntary, and unspecific

  • Involuntary and specific

Explanation

Question 3 of 18

1

Smooth muscle is essential for building pressure in the blood vessels.

Select one of the following:

  • True
  • False

Explanation

Question 4 of 18

1

Which two types of junction are important in cardiac muscle(cardiomyocytes), and what is their nature of connection?

Select one of the following:

  • Desmosomes - Mechanical, Gap junctions - Electrical

  • Desmosomes - Electrical, Gap junctions - Mechanical

  • Gap junctions - Electrical, Tight junctions - Mechanical

  • Gap junctions - Mechanical, Tight junctions - Electrical

Explanation

Question 5 of 18

1

Choose the correct statement about the heart.

Select one of the following:

  • The joining of two myocytes is an intercalated disk.

  • Pacemaker cells reside in the atrioventricular node

  • An action potential reaching the sinoatrial node will be passed on to the atrioventricular node

  • Pacemaker cells are stimulus dependant.

Explanation

Question 6 of 18

1

Choose the correct sequence of steps for contraction of the heart.

Select one of the following:

  • Depolarised atria > septum > apex > ventricles partially, then fully

  • Depolarised atria > apex > septum > ventricles partially, then fully

Explanation

Question 7 of 18

1

Choose the correct statements about contraction of the heart.

Select one or more of the following:

  • Muscle movements must be coordinated.

  • The ventricles are initially polarised via the Bundles of His after the apex is polarised.

  • The apex is initially polarised via the Bundles of His after the septum is polarised.

  • The depolarisation of the ventricles is initiated via the Purkinje fibres after the septum is polarised.

  • The depolarisation of the ventricles is via the Purkinje fibres after the apex is polarised.

Explanation

Question 8 of 18

1

The heart can beat outside of the body because of it's own 'mini nervous system.'

Select one of the following:

  • True
  • False

Explanation

Question 9 of 18

1

Choose the incorrect statement about smooth muscle.

Select one of the following:

  • Smooth muscle has actin and myosin, but it is not arranged in sarcomeres

  • Smooth muscle allows for large changes in length.

  • Smooth muscle is poor at retaining tension.

  • Smooth muscle is arranged in bundles by dense bodies

Explanation

Question 10 of 18

1

Single unit smooth muscle is by gap junctions. cells need receptors for neurotransmitters, and the action potential is transferred to all other cells. Thus, they work as a single unit. Examples include the digestive, urinary, and reproductive tract walls.
In multi-unit smooth muscle, there are between cells and cells have receptors. This allows for finer or more muscle control. An example is the muscles in the eye, or the blood vessel s/sheets.

Drag and drop to complete the text.

    joined
    Only some
    All
    connected
    no gap junctions
    gap junctions
    all
    some
    precise

Explanation

Question 11 of 18

1

Relaxation of smooth muscle causes vasodilation in blood vessels, while contraction causes vasoconstriction.

Select one of the following:

  • True
  • False

Explanation

Question 12 of 18

1

Normal smooth muscle tone is a semi tensed state.

Select one of the following:

  • True
  • False

Explanation

Question 13 of 18

1

Choose the correct statement about smooth muscle contraction.

Select one of the following:

  • Ca++ binds to calmodulin in the sarcoplasm.

  • Ca-Calmodulin complexes activate MLC (myosin light chain)

  • MLC (myosin light chain) actives MLCK (myosin light chain kinase)

  • MLCK (myosin light chain kinase) activates cross bridges

  • The dephosphorylated form of MLC causes contraction.

Explanation

Question 14 of 18

1

Skeletal muscle is:

Select one or more of the following:

  • Multinucleate

  • Mononucleate

  • Striated

  • lacking sarcomeres

  • long, cylindrical

Explanation

Question 15 of 18

1

Cardiac muscle is:

Select one or more of the following:

  • Mononucleate

  • Multinucleate

  • Striated

  • lacking sarcomeres

  • branching

Explanation

Question 16 of 18

1

Smooth muscle is:

Select one or more of the following:

  • Striated

  • Mononucleate

  • Multinucleate

  • lacking sarcomeres

  • spindle shaped

Explanation

Question 17 of 18

1

Skeletal and smooth muscle are both thin filament regulated.

Select one of the following:

  • True
  • False

Explanation

Question 18 of 18

1

Smooth muscle does not have T-Tubules.

Select one of the following:

  • True
  • False

Explanation

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