Veins look blue, but the blood inside them is red
Veins near the skin can look blue because light changes as it passes through skin and because of how our vision interprets it. The oxygen-poor blood inside veins is actually dark red, not blue.
blue-looking veins skin light scattering dark red blood
¿Te gusta? Hay todo un feed de cosas así.
Cambia el scroll vacío por cosas que merecen la pena conocer.
Descargar Hence gratis