What are the passageways leading from the nose to where oxygen can be absorbed into the blood stream? Explain how both diffusion and convection are necessary to deliver oxygen from the nasal cavity to the cells of the body.

Beginning with the alveolar space, place the following layers of the respiratory membrane into the correct order.  a) capillary basement membrane  b)interstitial tissue  c)capillary epithelial cells  d)alveolar basement membrane  e)alveolar epithelial cells  f)blood  g)fluid and surfactant in the alveolus

Human Lung Describe how the histological structure of the lung relates to its function as a site for gas exchange. Which tissues are present in the lung, and which are not? Which structures/surfaces of the lung are covered with at least a thin film of water? What are the most important diseases of the lung, and how do they impair its function?

Write two paragraphs describing how air can go into the lungs and back out of the body.  Paragraph 1 should be inspiration and paragraph 2 should be expiration. Use the following vocabulary:  Diffusion                                                  Thoracic cavity Inspiration                                                High air pressure outside the body  Expiration                                                 Low pressure outside the body Intercostal muscles                                 High pressure in the lung Diaphragm                                                Volume of Lung Low air Pressure inside the lung

How does the concept of partial pressure explain the diffusion of oxygen into our blood stream?  Why does this become more difficult at high altitudes?

If there is decreased oxygen content in skeletal muscle tissue, arterioles supplying the skeletal muscles will ____.  If there is decreased oxygen content in the alveoli, pulmonary arterioles will ____.   Choose from the following: (A) dilate / dilate (B) constrict / constrict (C) constrict / dilate (D) dilate / constrict

Which of the following is the respiratory membrane composed of? A) respiratory bronchioles and alveolar ductsb) respiratory b) bronchioles and alveolar sacs c ) alveolar sacs and alveolar ducts d) alveolar and capillary walls and their fused basement membranes

When considering the limitations of external respiration, explain why animals larger than flatworms require specialized structures for ventilation. List two examples of these specialized structures.

Type II alveolar cells have which of the following function? A) replace mucus in the alveoli B) protect. The lungs from bacterial invasion D) produce surface tension E) secrete surfactant

The alveolar walls are composed of two types of cells type I and type II pneumocytes. The function of type II cells is to O increase surface tension O secrete surfactant O decrease surface tension O trap dust and other debris O b) and c) O b) and d)