Trace oxygen from the outside in, include how the o2 gets across the blood and tissues>?

Answer 1

The diaphragm contracts to increase the volume of the lungs and decrease the pressure. This causes the inflow of air into the lungs. At the level of the alveoli the epithelium is only one cell thick and is highly vascular. The oxygen is non-polar and is therefore able to diffuse across the cell membrane down its concentration gradient. The concentration of oxygen is lower in the blood than in the alveolus, so oxygen goes into the blood. Some of the oxygen will remain in solution, but most will be bound to hemoglobin in red blood cells. The red blood cell will then be pumped to the periphery of the body where the oxygen concentration is relatively low. Capillaries are the smallest blood vessels with an endothelial wall only one cell thick. Oxygen is released by hemoglobin so that it can diffuse across the endothelium into the tissue.

Answer 2

Movement of the diaphragm/chest muscles draws in the atmosphere. Alveoli in the lungs grab the oxygen molecules and bind them to deoxygenated blood that has been sent back to the lung for processing. Reoxygenated blood is sent via hemoglobin throughout the body. The brain uses sugar in the blood and oxygen to think. Meanwhile, oxygen is used to make amino acids which are sent to the muscles for food to support physical activity. The "food" is stripped and all that remains is lactic acid. Lactic acid is a form of waste and it is produced very quickly during exercise, which is why your muscles begin to hurt.

Answer 3

in humans, the hemoglobin in red blood cells binds oxygen in the lungs and the heart pumps the blood to the tissues. in the tissues, the oxygen gets dumped off. then the blood returns to the lungs to get reoxygenated.

Answer 4

O2...nose/mouth/trachea/bronchus/brochioles/alveolus/capillary/red blood cell/tissue