Questão 1
Questão
[blank_start]Skeletal[blank_end] muscle is for movement, posture, and heat. [blank_start]Cardiac[blank_end] muscle is for pumping [blank_start]blood[blank_end]. [blank_start]Smooth[blank_end] muscle is for moving [blank_start]contents of the viscera[blank_end] and has specific functions.
Responda
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Skeletal
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Cardiac
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blood
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Smooth
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contents of the viscera
Questão 2
Questão
Which of these descriptions matches skeletal muscle?
Questão 3
Questão
Smooth muscle is essential for building pressure in the blood vessels.
Questão 4
Questão
Which two types of junction are important in cardiac muscle(cardiomyocytes), and what is their nature of connection?
Responda
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Desmosomes - Mechanical, Gap junctions - Electrical
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Desmosomes - Electrical, Gap junctions - Mechanical
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Gap junctions - Electrical, Tight junctions - Mechanical
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Gap junctions - Mechanical, Tight junctions - Electrical
Questão 5
Questão
Choose the correct statement about the heart.
Responda
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The joining of two myocytes is an intercalated disk.
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Pacemaker cells reside in the atrioventricular node
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An action potential reaching the sinoatrial node will be passed on to the atrioventricular node
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Pacemaker cells are stimulus dependant.
Questão 6
Questão
Choose the correct sequence of steps for contraction of the heart.
Responda
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Depolarised atria > septum > apex > ventricles partially, then fully
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Depolarised atria > apex > septum > ventricles partially, then fully
Questão 7
Questão
Choose the correct statements about contraction of the heart.
Responda
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Muscle movements must be coordinated.
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The ventricles are initially polarised via the Bundles of His after the apex is polarised.
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The apex is initially polarised via the Bundles of His after the septum is polarised.
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The depolarisation of the ventricles is initiated via the Purkinje fibres after the septum is polarised.
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The depolarisation of the ventricles is via the Purkinje fibres after the apex is polarised.
Questão 8
Questão
The heart can beat outside of the body because of it's own 'mini nervous system.'
Questão 9
Questão
Choose the incorrect statement about smooth muscle.
Responda
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Smooth muscle has actin and myosin, but it is not arranged in sarcomeres
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Smooth muscle allows for large changes in length.
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Smooth muscle is poor at retaining tension.
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Smooth muscle is arranged in bundles by dense bodies
Questão 10
Questão
Single unit smooth muscle is [blank_start]joined[blank_end] by gap junctions. [blank_start]Only some[blank_end] cells need receptors for neurotransmitters, and the action potential is transferred to all other [blank_start]connected[blank_end] cells. Thus, they work as a single unit. Examples include the digestive, urinary, and reproductive tract walls.
In multi-unit smooth muscle, there are [blank_start]no gap junctions[blank_end] between cells and [blank_start]all[blank_end] cells have receptors. This allows for finer or more [blank_start]precise[blank_end] muscle control. An example is the muscles in the eye, or the blood vessel s/sheets.
Responda
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joined
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Only some
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All
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connected
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no gap junctions
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gap junctions
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all
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some
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precise
Questão 11
Questão
Relaxation of smooth muscle causes vasodilation in blood vessels, while contraction causes vasoconstriction.
Questão 12
Questão
Normal smooth muscle tone is a semi tensed state.
Questão 13
Questão
Choose the correct statement about smooth muscle contraction.
Responda
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Ca++ binds to calmodulin in the sarcoplasm.
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Ca-Calmodulin complexes activate MLC (myosin light chain)
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MLC (myosin light chain) actives MLCK (myosin light chain kinase)
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MLCK (myosin light chain kinase) activates cross bridges
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The dephosphorylated form of MLC causes contraction.
Questão 14
Questão
Skeletal muscle is:
Responda
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Multinucleate
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Mononucleate
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Striated
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lacking sarcomeres
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long, cylindrical
Questão 15
Questão
Cardiac muscle is:
Responda
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Mononucleate
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Multinucleate
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Striated
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lacking sarcomeres
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branching
Questão 16
Questão
Smooth muscle is:
Responda
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Striated
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Mononucleate
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Multinucleate
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lacking sarcomeres
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spindle shaped
Questão 17
Questão
Skeletal and smooth muscle are both thin filament regulated.
Questão 18
Questão
Smooth muscle does not have T-Tubules.