Question

The blood vessels are protected by the

Answer 1

Answer:

New research shows that vitamins can improve blood flow and prevent the long-term development of atherosclerosis -- or hardening of the arteries -- when given in combination with an amino acid known as L-arginine. Antioxidants, such as vitamins A, B, C, and E, are found in many fruits and vegetables.

Explanation:

Answer 2

Answer:

Red blood cells, most white blood cells, and platelets are produced in the bone marrow, the soft fatty tissue inside bone cavities. Two types of white blood cells, T and B cells (lymphocytes), are also produced in the lymph nodes and spleen, and T cells are produced and mature in the thymus gland.