NPB Midterm III - Respiratory System

Obtain O2 for use by the body's cells and to eliminate the CO2 the body cells produce

Ratio of CO2 produced / O2 consumed
200/250 = 0.8

Foodstuff consumed

Metabolic processes carried out in the mitochondria which use O2 and produce CO2 while deriving energy from nutrient molecules

Entire sequence of events in exchanging O2 and Co2 between teh external environment and the cells of the body

1 Liter of oxygen

1. Ventilation/gas echange between the atmopshere and air sacs (alveoli) in the lungs
2. Exchange of O2 and Co2 between air in the alveoli and the blood in the pulmonary capillaries
3. Transport of O2 and CO2 by the blood between the lungs and the tissues
4. Exchange of O2 and Co2 between the blood in the systemic capillaries and tissue cells (Cellular Respiration)

1. route for water loss and heat elimination
2. enhances venous return
3. Helps maintain normal acid-base balance
4. Refends against inhaled foreign matter
5. Removes modifies, activates, or inactivates various materials passing through the pulmonary circulation

1. respiratory AIRWAYS leading into the lungs
2. Lungs
3. Structures of the thorax involved in producing movement of air through the airways into and out of the lungs

Lungs collapse but all the alveolis stay open

Nasal passages -> mouth -> pharynx -> larynx -> trachea -> cartilaginous ring -> right bronchus -> bronchiole

Protrusion of the larynx

2 bands of elastic tissue that lie across the opening of the larynx

Laryngeal opening

Common passageway for respiratory and digestive systems