âThey were very sleek and small and had room for two in the front, and one cramped backseat for a third person in the back.â âThey were sleek, simple, perfect vehicles for attacking in large numbers and flying away without a trace.â âThis jacket can be worn with sleek pants and a stylish shirt, or a classic sweater and jeans.â
A red blood cell count is a blood test that your doctor uses to find out how many red blood cells (RBCs) you have in your blood. It is also called an erythrocyte count. The test is important because RBCs contain hemoglobin, which carries oxygen to your bodyâs tissues.
Human blood is red because of the iron in the haemoglobin. This gives red blood cells their red colour. Veinous blood is much darker than arterial blood, and your teacher is right that oxygenated (arterial) blood is 'redder' than deoxygenated (veinous) blood. However, human blood is not blue. Some animals do have blue blood though.