If the red blood cells stop working properly, there a number of things that could possibly happen. There are various disorders and conditions that may occur which include dehydration, chronic inflammation, damage of the bone marrow and so many others.
Sickle Cells?
Blood brings oxygen and nutrients to the muscle cells, it carries away carbon dioxide, other waste materials and excess heat from the cells
cancer
Abnormal, iron-saturated red cells are present in the blood of people who have this disease. Although the iron circulates normally from the plasma to the bone marrow, where new red blood cells are created, it is not properly incorporated
Materials needed by the cells move from the blood into the cells, and waste materials move from the cells into the blood.
it dies
whiteblood cells and red blood cells
Polycythemia or an increase in red blood cells
When red blood cells stop functioning properly in leukemia, it leads to anemia, resulting in symptoms like fatigue, weakness, and pallor due to insufficient oxygen transport in the body. Leukemia disrupts normal blood cell production, causing an overproduction of abnormal white blood cells, which crowd out healthy red blood cells. Treatment often involves chemotherapy to target and kill cancerous cells, as well as potential stem cell transplantation to restore healthy blood cell production. Supportive care, such as blood transfusions, may also be required to manage symptoms of anemia.
They die
If they do, it would be the same as if someone cut your air off. You would die due to lack of oxygen.
nothing immediatley, but there will be consequences, in case of cancer cells, they spread tumor to the surrounding organs/tissue system