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A major source of calcium that initiates contraction of smooth muscle is:

A young child is admitted to the emergency department. The child exhibits extreme salivation, lacrimation, tremors, and tachycardia. The slight erythema and mild edema found on the child’s hand suggest a spider bite. The mother acknowledges that the child has a fascination with spiders and has seen black widow spiders in the yard. The neurotoxic venom of the black widow spider (i.e., latrotoxin or latrophilin) can increase the flux of calcium ions into the presynaptic terminal. This means that the spider bite will cause: 

Smooth muscle contraction can be initiated by:

Determine the validity of the following: Smooth muscle can maintain a contraction for a relatively long time with minimal energy usage because the latch mechanism is present in smooth muscle.

Myasthenia gravis is an autoimmune disease in which antibodies cause damage to the: 

A patient presents with stress urinary incontinence and is prescribed a pelvic floor muscle exercise program. What is the primary rationale for this intervention?

The correct temporal order of events for skeletal muscle is: 

You are having your patient perform hip abduction exercises in side-lying, what is a substitution pattern that would indicate that the exercise is too difficult?

The thick and thin filaments of skeletal muscle are BEST described as:

When billing according to the 8-minute rule or rule of 8’s, units are viewed in increments of: