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Which structure does not contain smooth muscle? (Points : 2) blood vessels heart digestive tract bronchi
Weegy: heart digestive tract bronchi (More)
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Asked 5/19/2012 3:50:41 PM
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The body stores a carbohydrate called ____________ in the muscle; it can be converted to a usable energy source
Weegy: The body stores a carbohydrate called ____________ in the muscle; it can be converted to a usable energy source Glycogen (More)
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Asked 5/19/2012 3:58:48 PM
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lbow flexion is the action of the _____________ muscle.
Weegy: Arm muslce (More)
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Asked 5/19/2012 4:03:25 PM
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Explain the steps needed ina skeletal muscle contraction.
Weegy: (1) The sequence of events leading to contraction is initiated somewhere in the central nervous system, [ either as voluntary activity from the brain or as reflex activity from the spinal cord. (2) A motor neuron in the ventral horn of the spinal cord is activated, and an action potential passes outward in a ventral root of the spinal cord. (3) The axon branches to supply a number of muscle fibers called a motor unit, and the action potential is conveyed to a motor end plate on each muscle fiber. (4) At the motor end plate, the action potential causes the release of packets or quanta of acetylcholine into the synaptic clefts on the surface of the muscle fiber. (5) Acetylcholine causes the electrical resting potential under the motor end plate to change, and this then initiates an action potential which passes in both directions along the surface of the muscle fiber. ] (More)
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Asked 5/19/2012 4:09:15 PM
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lbow flexion is the action of the _____________ muscle.
Weegy: Biceps brachii: originates from the caudal side of the scapula and inserts into the radial tuberosity. Flexes the elbow, and is the part of the stay apparatus that keeps the elbow and shoulder from bending. [ Brachialis: originates from the caudoproximal side of the humerus, inserts into the craniomedial side of proximal radius. Flexes the elbow joint. ] User: Explain the relationship between origin, insertion, and action of skeletal muscles. (More)
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Asked 5/19/2012 4:03:18 PM
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