Which of the following occurs after tissues are injured?A. Local blood vessels begin to dilateB. Red blood cells separate from plasmaC. Platelets collect at the injury siteD. Red blood cells become less sticky
Platelets collect at the injury site
C. Platelets collect at the injury site.
When tissues are injured, platelets are the first cells to arrive at the site of injury and begin to collect there. Platelets are small, colorless blood cells that play an important role in blood clotting. They clump together at the site of injury to form a plug that helps to stop bleeding and prevent further loss of blood.
After platelets collect at the injury site, local blood vessels begin to constrict in order to reduce blood flow to the area. This helps to limit the amount of blood that is lost through the injury. Additionally, red blood cells may become more sticky in order to help form clots and stop bleeding.
Over time, the injured tissues may begin to heal and the blood vessels in the area will begin to dilate in order to bring more blood, oxygen, and nutrients to the area. This is an important part of the healing process.
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