Which pigment secreted by specialized cells in the skin is capable of absorbing ultraviolet light?

you can have just about every answer you can think of

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.