Pregunta 1
Pregunta
[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.
Respuesta
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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
Pregunta 2
Pregunta
Which of these descriptions matches skeletal muscle?
Pregunta 3
Pregunta
Smooth muscle is essential for building pressure in the blood vessels.
Pregunta 4
Pregunta
Which two types of junction are important in cardiac muscle(cardiomyocytes), and what is their nature of connection?
Respuesta
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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
Pregunta 5
Pregunta
Choose the correct statement about the heart.
Respuesta
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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.
Pregunta 6
Pregunta
Choose the correct sequence of steps for contraction of the heart.
Respuesta
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Depolarised atria > septum > apex > ventricles partially, then fully
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Depolarised atria > apex > septum > ventricles partially, then fully
Pregunta 7
Pregunta
Choose the correct statements about contraction of the heart.
Respuesta
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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.
Pregunta 8
Pregunta
The heart can beat outside of the body because of it's own 'mini nervous system.'
Pregunta 9
Pregunta
Choose the incorrect statement about smooth muscle.
Respuesta
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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
Pregunta 10
Pregunta
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.
Respuesta
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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
Pregunta 11
Pregunta
Relaxation of smooth muscle causes vasodilation in blood vessels, while contraction causes vasoconstriction.
Pregunta 12
Pregunta
Normal smooth muscle tone is a semi tensed state.
Pregunta 13
Pregunta
Choose the correct statement about smooth muscle contraction.
Respuesta
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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.
Pregunta 14
Pregunta
Skeletal muscle is:
Respuesta
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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
Pregunta 15
Pregunta
Cardiac muscle is:
Respuesta
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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
Pregunta 16
Pregunta
Smooth muscle is:
Respuesta
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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
Pregunta 17
Pregunta
Skeletal and smooth muscle are both thin filament regulated.
Pregunta 18
Pregunta
Smooth muscle does not have T-Tubules.