Each subunit contains an iron containing pigment (heme) and a protein (globulin). There are two types of subunits, alpha and beta. Each gram of hemoglobin can carry 1.34 ml of oxygen. The oxygen carrying ability of blood is directly proportional to its hemoglobin concentration.
Flu (Influenza) The flu is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness. It can also cause death in severe cases. The flu can affect your lungs when you have asthma. It can cause inflammation (swelling) and narrowing of your airways.
The virus begins to cause serious illness worldwide. With past flu pandemics, the virus reached all parts of the globe within six to nine months. With the speed of air travel today, public health experts believe an influenza pandemic could spread much more quickly. A pandemic can occur in waves.