View video which examines the physical mechanism of breathing. Examine and discuss the muscles involved and their movement. Examine the pressure differences between the plural cavity and the atmosphere which cause inhalation and exhalation to occur. Fill in activity sheet "mechanism of breathing".

Outline the process and steps involved with ova fertilization and implantation of the zygote. Using diagrams, examine the normal route of implantation into the uterine wall, after the endometrium has been prepared for the implantation through the action of estrogen and progesterone. Discuss the problems which will occur if the fertilized egg implants in the fallopian tube rather than in the endometrium.

Discussion of the mechanism of breathing. Defining of ventilation, inhalation, and exhalation. Examine how the process involves specific muscles, the intercostal and the diaphragm muscle as well as nerves originating from the respiratory center in the medulla. Discuss briefly the physics of air pressure and the inverse relationship between pressure and the volume of he thorax. As chest volume increases, pressure deceases below atm. pressure, and air rushes into the lungs. In the lab, manufacture lung/chest cavity model using a plastic bottle, balloon, and stretch tight wrap for a diaphragm. Demonstrate the physical process of breathing.

View video of the pathway taken by air from the nose/mouth into the lungs and alveoli. Discuss the role location of each section and the role played in cleaning, moistening, and directing the air into the correct tubules. View how the alveoli allow the oxygen and carbon dioxide to exchange with the blood.

Discussion of the physiology of asthma and the anatomy of the bronchioles in an asthmatic patient. View the anatomy of the alveoli using diagrams, along with the major function of these units of function of the respiratory system. Discuss the gases present in air and how they diffuse into the capillaries within the alveoli

From anatomical diagrams, fill in the activity sheet which answers questions regarding the trachea. Discuss the trachea, cartilage rings, bronchial tubes and bronchioles. Introduce the respiratory symptom of Asthma, and how the non cartilage containing bronchiole can constrict and hinder breathing. Introduce treatment.

View a video which outlines and explains the functions of he upper respiratory tract. Examine the anatomy and physiology of the olfactory receptors seen on the video. In the lab, demonstrate through blindfolded smelling of various known items that the brain will recall many scents from the past.
Examine through the use of the video the need for a respiratory system rather than just diffusion through our skin of oxygen and carbon dioxide.

Continue with the anatomy and physiology of the upper respiratory system. Discuss the olfactory receptors, the sinuses, the tonsils located in the pharynx region and the upper trachea.

Anatomy and physiology of the upper respiratory system. Discuss using diagrams as reference the nares and nasal passages. Elicit the benefits of breathing nasally. Discuss how the air is moistened by mucus and cleansed by the nasal cilia. Describe the physiology of the epiglottis and the function of the trachea. Examine how bacteria are trapped by mucous, swallowed, and destroyed by swallowing.

Discuss the function of the respiratory system. Show how some singers can control their breathing which allows for a steady flow during a song. From a diagram, separate the system in the upper and lower respiratory system. Use a diagram of the upper system to name the major parts, starting from the nasal openings to the larynx and vocal cords