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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 sport of bodybuilding is very exciting as well as controversial. This is mostly due to the stereotype that many in the business are involved in the use of steroids. Regardless of whether or not steroids are used, achieving such a body has its consequences. Do a little to find out what happens in the body as an individual cuts certain things out of their diet in order to achieve a lean, muscular body?
Weegy: At a base level, the body begins digging into stored forms of energy to supply its needs. The three forms of stored energy in the mammalian body are glycogen, amino acids (protein), and adipose tissue (fat). (More)
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Asked 5/19/2012 12:32:53 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: Arm muslce (More)
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Asked 5/19/2012 4:03:25 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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