Questions: Which of these formed elements is for transportation of oxygen? white blood cells leukocytes platelets erythrocytes

The answer is the fourth one: erythrocytes.

Explanation for each option:

1. White blood cells: These are part of the immune system and are primarily involved in defending the body against infections and foreign invaders. They do not transport oxygen.

2. Leukocytes: This is another term for white blood cells, so they also do not transport oxygen. Their main function is related to the immune response.

3. Platelets: These are cell fragments that play a crucial role in blood clotting and wound healing. They do not have a role in oxygen transport.

4. Erythrocytes: These are red blood cells, and their primary function is to transport oxygen from the lungs to the tissues and organs throughout the body. They contain hemoglobin, a protein that binds oxygen, making them the correct answer.

In summary, erythrocytes are the formed elements responsible for the transportation of oxygen in the blood.