Questions: What are the formed elements? Multiple Choice Sodium and potassium Bone marrow and the thymus Blood cells and platelets Blood and lymph

The answer is the third one: blood cells and platelets.

Explanation for each option:

• Sodium and potassium: These are electrolytes, not formed elements. They are essential for various bodily functions but do not constitute the formed elements in blood.
• Bone marrow and the thymus: These are organs involved in the production and maturation of blood cells, but they themselves are not formed elements.
• Blood cells and platelets: This is correct. Formed elements in the blood include red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes).
• Blood and lymph: These are types of body fluids. Blood contains formed elements, but lymph does not.

Summary: The formed elements are blood cells and platelets.