Question

human blood is... red when oxygenated and blue when deoxygenated. red when deoxygenated and blue when oxygenated. always bright red. always some shade of red.

Explanation:

Oxygenated human blood is bright - red due to oxy - hemoglobin. Deoxygenated blood is a darker shade of red, not blue. So blood is always some shade of red.

Answer:

always some shade of red.