19. When aging, the following detrimental changes occur in the thorax except:
So‘rovnoma
- a) The ribs and costal cartilages become more rigid
- b) The elastic tissue in the lungs tends to degenerate
- c) The maubriosternal joint becomes more mobile
- d) The thoracic and abdominal muscles tend to atrophy
- e) The xiphoid process becomes ossified