Why Does Tetany Not Occur in Cardiac Muscle

question 114

Multiple Choice

Why does tetany not occur in cardiac muscle?

• A)Tetany does not occur because the sarcoplasmic reticulum in cardiac muscle does not hold as much calcium for maximum sustained contractions.
• B)Tetany does not occur because the gap junctions in cardiac muscle prevent the sustained contraction.
• C)Tetany does not occur because cardiac muscle has a long refractory period that continues until relaxation is well under way so summation cannot occur,and thus tetany cannot occur.
• D)Tetany does not occur because cardiac muscle cells are branched instead of lying in parallel fibers like skeletal muscle.
• E)Tetany does not occur because the depolarizations in cardiac muscle are not sufficient to cause the formation of action potentials.

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Definitions:

Sensory Receptors

Specialized cells or nerve endings that respond to changes in the environment by converting energy from a specific stimulus into an electrical signal.

Auditory Tube

Also known as the Eustachian tube, it connects the middle ear to the nasopharynx and helps equalize pressure on both sides of the eardrum.

External Ear

Portion of the ear that includes the auricle and external acoustic meatus; terminates at the eardrum.

Depth Perception

Ability to distinguish between near and far objects and to judge their distance.