Final answer:
The injuries described in the question are an example of bleeding from capillaries.
Step-by-step explanation:
The student's injuries, specifically the abrasions on both knees and the palms of both hands, which are oozing blood, are an example of bleeding from capillaries. Capillaries are the smallest blood vessels in the body and they connect arteries and veins, allowing for the exchange of oxygen, nutrients, and waste products between the blood and the surrounding tissues.