__ transport oxygen from the lungs to the body tissues and carry carbon dioxide back to the lungs. white blood cells alveoli sickle cells red blood I cells lymphocytes

## Step 1<br />The question is asking which type of cell is responsible for transporting oxygen from the lungs to the body tissues and carrying carbon dioxide back to the lungs. <br /><br />## Step 2<br />The options provided are white blood cells, alveoli, sickle cells, red blood cells, and lymphocytes. <br /><br />## Step 3<br />White blood cells are part of the immune system and are responsible for fighting infections. They do not transport oxygen.<br /><br />## Step 4<br />Alveoli are tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place. They are not cells, but rather structures within the lungs.<br /><br />## Step 5<br />Sickle cells are a type of red blood cell that is shaped like a sickle. They are associated with a genetic disorder called sickle cell anemia, which can cause blockages in the blood vessels. They do not transport oxygen efficiently.<br /><br />## Step 6<br />Red blood cells, also known as erythrocytes, are the cells that carry oxygen from the lungs to the body tissues and carry carbon dioxide back to the lungs. This is their primary function.<br /><br />## Step 7<br />Lymphocytes are a type of white blood cell that is part of the immune system. They do not transport oxygen.