The human body contains more than 650 different muscles in three
categories, all under the control of the nervous system. Striated, or
skeletal, muscles, come under conscious, or voluntary, control. Smooth,
or visceral, muscles, such as those found in the digestive tract, are
connected to organs and perform their work outside of voluntary control.
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Answer:
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Explanation:
Answer:
Blood clotting normally occurs when there is damage to a blood vessel.
Explanation:
Platelets immediately begin to adhere to the cut edges of the vessel and release chemicals to attract even more platelets. A platelet plug is formed, and the external bleeding stops.
Next, small molecules, called clotting factors, cause strands of blood-borne materials, called fibrin, to stick together and seal the inside of the wound. Eventually, the cut blood vessel heals and the blood clot dissolves after a few days.
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