Gaseous Exchange and The Respiratory System

• Gaseous exchange is a process whereby oxygen is exchanged with carbon- dioxide between alveoli located in the lungs and the blood- stream.
• Inhalation is a process whereby air is transported to the alveoli so that oxygen can diffuse into the blood and aerobic respiration can take place
• Exhalation is a process whereby air rich in CO2 is removed from the lungs via the nasal cavity/ a process whereby air from the lungs travel through the air passages and is expelled via the nasal cavity or mouth.
• Breathing only occurs via the mouth if the nostril is congested with mucus.
• Breathing only occurs via the mouth if the nostril is congested with mucus.
• Respiratory surfaces refers to a structure within the organism that facilitates gaseous exchange.
• The respiratory surface must be moist, thin, have a large surface area and be vascular.
• 6 components of air are: - carbon- dioxide,- oxygen,- nitrogen,- water vapor/ moisture,- dust, - hydrogen
• oxygen- about 21% inhaled air, 16% exhaled air
• carbon- dioxide is about 0,04% inhalaed are and 4% exhaled air
• hydrogen is 1 % inhaled air and 1 % exhaled air
• nirtrogen is 79% inhaled and exhaled air
• Noble gas is 0.01% exhaled and inhaled air
• water vapor varies and temperatrue according to the environment for inhaled air and is higher for exhaled hair
• dust particles are high in inhaled air and low in exhaled air