Final answer:
The statement is true; vascular spasm involves the contraction of blood vessel walls and platelet plug formation involves the aggregation of platelets as part of the hemostatic process.
Step-by-step explanation:
Vascular spasm is an immediate contraction of the smooth muscle in the walls of arteries and arterioles, and platelet plug formation involves the aggregation of platelets. Both processes are part of hemostasis, the mechanism that stops bleeding when a blood vessel is injured. During a vascular spasm, the smooth muscle fibers contract, which results in the narrowing of the blood vessel and reduces blood loss. At the injury site, platelets adhere and release chemicals that activate more platelets, aggregating to form a temporary seal. This series of events happens very quickly after injury and is a crucial first line of defense to prevent excessive bleeding.
Vascular spasm is an immediate contraction of the smooth muscle in the walls of arteries and arterioles, while platelet plug formation involves the aggregation of platelets. In vascular spasm, the smooth muscle contracts dramatically in response to vessel injury, reducing blood loss. Platelet plug formation occurs when platelets become activated and aggregate at the site of injury, leading to the formation of a temporary seal in the blood vessel.