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Which of the following is essential for smooth muscle contraction but not skeletal muscle contraction?

A 29-year-old man goes to the local gym to lift weights. He begins by bench-pressing 130 pounds as a warm-up procedure and then gradually increases the weight. Which of the following sets of changes occur as he adds more weight?

Determine the validity of the following: The control mechanism of smooth muscle contraction is myosin-based because the calcium-calmodulin complex binds to myosin light chain kinase.

Lifting a 30 pound dumbbell will have what result on muslce contraction? 

The difference between Myasthenia Gravis (MG) and Lambert-Eaton Myasthenic Syndrome (LEMS) is that:

Large amounts of calcium are stored in what structures in cardiac muscle, but NOT in skeletal muscle:

A 24-year-old woman is admitted to the emergency department after an automobile accident in which lacerations to the left wrist severed a major tendon. The severed ends of the tendon were overlapped by 6 centimeter to facilitate suturing and reattachment. Which of the following characteristics would be expected after six weeks compared with the preinjured muscle? Assume that series growth of sarcomeres cannot be completed within 6 weeks.

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: