What is the expected effect of infra-red rays on the bloodstream?

Infra-red rays are known for their therapeutic effects on the body, particularly in enhancing circulation. When infra-red rays penetrate the skin, they produce heat, which subsequently causes vasodilation, or the widening of blood vessels. This process facilitates increased blood flow and improves circulation throughout the body. Enhanced circulation can lead to better oxygenation of tissues and more efficient removal of waste products, promoting overall tissue health and recovery.

In contrast, the other options reflect effects that are not typically associated with infra-red therapy. For instance, constriction of blood vessels would limit blood flow rather than enhance it, while clogging blood flow contradicts the principle of improved circulation. Lastly, while infra-red rays may contribute to a temporary reduction in blood pressure due to vasodilation, their primary and most beneficial effect is enhancing circulation. Thus, saying that infra-red rays enhance circulation aligns with the established understanding of their impact on the bloodstream.