A 45-year-old man addressed a surgeon with complaints of pain and a feeling of heaviness in the lower limbs, the frequent appearance of edema in the ankle joints, dilation of the subcutaneous veins of the lower limbs. The doctor diagnosed "varicose veins of the lower extremities." The cause of this disease is considered a violation of the structure of the venous wall or insufficiency of the valvular apparatus. These tissues are characterized by high stretchability under load and rapid restoration of the original shape and size after load’s removal.

What is the main stretchable protein of the walls of blood vessels, ligaments and lungs elastin

What are the features of the amino acid composition of this protein? alanine,valine,levsine,isoloosine

What pathological condition does deficiency of α1-antitrypsin in the lungs cause-emphysema

What type of collagen is present in the walls of blood vessels?type 3

How many stages of collagen synthesis are there 8(extracellular-3,intracellular-5)