Cockroach blood contains no red blood cells to transport oxygen because its respiratory system is open. This means that roach blood is pale yellow or colorless.
Regular blood cells contain respiratoy pigment in them.
Reg blood cells contains the respiratoy pigment haemoglobin.
Respiratory system in cockroaches is well developed. It consists of Tracheae,Tracheoles and Spiracles.Gaseous exchange occurs by simple diffusion between air in tracheae and dissolved gases in blood or tracheolar fluid which has been shown to rise and fall.The blood in cockroach however do not contain respiratory pigment. :D -Diksha Chhabra ^_^
Haemoglobin is the respiratory pigmaent of blood in mammals
the respiratory pigment in humans is hemoglobin
They haemoglobin pigment present in the blood gives it the red colour.this pigment is found in the RBCs hence making them red in colour.
The respiratory pigment is a molecule that increases the oxygen-carrying capacity of the blood. In man this is the hemoglobin. Hemoglobin is bright red when its been oxygenated, and a red-purple when it is deoxygenated.
Blood oranges are red because they contain a pigment called anthocyanin, which gives them their distinctive color. This pigment is not found in regular oranges, which is why blood oranges have a deeper red hue.
Heamoglobin contains iron
Not all animals have red blood. The color of blood depends upon the type of compound or respiratory pigment within the blood that transports oxygen from the lungs to the tissues. In all vertebrates (animals having a backbone) and a few invertebrates (animals lacking a backbone), an iron-containing protein called hemoglobin is responsible for oxygen transport. Hemoglobin is a red pigment and gives the blood a red color. Annelids (segmented worms) have either a green pigment, chlorocruorin, or a red pigment, hemerythrin. Some crustaceans (invertebrates with jointed bodies, such as crabs and shrimps) have a blue pigment, hemocyanin, in their blood. Cockroaches have no respiratory pigment, thus their blood is colorless.
cockroach
Oxygen is bound to a protein (a respiratory pigment), called hemoglobin.