Question

10. What is surfactant and why is it important?

11. What circulation is associated with the right side of the heart? The left?

12. What is hemoglobin?; what does it do?

13. Where in the body does hemoglobin pick up oxygen where does it release it

Answer 1

10.In relation to lungs, surfactants are known as pulmonary surfactants that is made by the type II alveolar cells and are lipoproteins complexes possesing both hydrophilic and hydrophobic ends.They are important as the lipid component i.e dipalmitoylphosphatidylcholine (DPPC) helps to reduce the surface tension in the lung at the air and liquid interface.It also helps in reduction of fluid accumulation in airways and thus keeps it dry.

11.The pulmonary circulation is associated with the right side of the heart while systemic circulation is associated with the left side of the heart. In the systemic circulation, the blood circulates through out the body and transports oxygen to all different tissues and organs and collects back carbon dioxide as a waste from them. In the pulmonary circulation, the blood is transported to and from the lungs so that carbon dioxide is released to the lungs and new oxygen is picked up.

12.Hemoglobin is a metalloprotein composed of iron that is present in the red blood cells of vertebrates.It functions to carry oxygen from lungs or to the other cells ,tissues and organs of the body.

13.Hemoglobin picks up oxygen from the lungs where there occurs incresed oxygen pressure in the capillaries and releases it to the body cells where there is lower oxygen pressue in the cells.