Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
Blood with fresh oxygen is carried from your lungs to the left side of your heart, which pumps blood around your body through the arteries. Blood without oxygen returns through the veins, to the right side of your heart
Some weight loss can be a normal part of aging usually due to shrinking muscle mass but it could be Gastrointestinal issues, which could lead to malnutrition or Hyperthyroidism and that can accelerate the body’s metabolism
Patient should be lying flat on the table - It may help to have them place hand on side to be examined behind their head, allowing easier access to breast and axilla.
