The exchange of gases between blood in capillaries and individual cells is called respiration.

Explain the process of gaseous exchange between the lungs and pulmonary capillaries at rest and during exercise.

Gas exchange between air in the alveoli and blood in pulmonary capillaries is called Blank______.Multiple choice question.cellular respirationinternal respirationexternal respiration

The process by which a gas dissolves in a liquid so that oxygen can be transported to the cells of our body is called:

The exchange of oxygen and carbon dioxide between alveolar air and blood occurs via;

Gas exchange takes place in the lungs. The diagram shows an alveolus next to a blood capillary in a lung. The arrows show the movement of two gases, A and B.3. (a) (i) Draw a ring around the correct answer to complete the sentence.Gases A and B move by diffusion. osmosis. respiration. (1) Page 7 of 18Ebroyonic cells have ethical dialemas as it involves the destruction of human embros wheras using your own bone marrow does not harm the patient It is more compatable so there is a less risk of rejection by the immune system as embroyinstem cells may not be compatable with the patientBone marrow cells are more available as they can be harvested from the patient at any given timewheras embryonic cells need a donor embryo which isnt always available(ii) Gas A moves from the blood to the air in the lungs. Gas A is then breathed out. Name Gas A. ______________________________________________________________ (1) (iii) Which cells in the blood carry Gas B? Draw a ring around the correct answer. platelets red blood cells white blood cells (1) (b) The average number of alveoli in each human lung is 280 million. The average surface area of 1 million alveoli is 0.25 m 2 . Calculate the total surface area of a human lung. ___________________________________________________________________ Answer ___________________________________ m 2 (2) (c) An athlete trains to run a marathon. The surface area of each of the athlete’s lungs has increased to 80 m 2 . Give one way in which this increase will help the athlete. ___________________________________________________________________ ___________________________________________________________________