Respiratory. Respiration Equation C 6 H 12 O 6 + 6O 2 = 6CO 2 + 6H 2 O Function of respiratory...
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Transcript of Respiratory. Respiration Equation C 6 H 12 O 6 + 6O 2 = 6CO 2 + 6H 2 O Function of respiratory...
Respiratory
Respiration EquationC6H12O6 + 6O2 = 6CO2 + 6H2O
Function of respiratory system: gas exchange. O2 in / CO2 out
Pathway of airNose/mouth--Pharynx--Larynx—
Trachea--Bronchi---Bronchioles---Lungs---Alveoli—Capillaries
Defenses-Nose-hair traps large particlesTrachea , bronchi and bronchioles- all lined with
cilia which beat upward to sweep particles away from lungs
Mucus moistens air, traps and filters particles.Trachea is covered by epiglottis when swallowing.
Lungs
AlveoliActual site of gas exchange. Network of capillaries surround alveoli. 1
cell thick
Pulmonary arteriole
Pulmonary venule
Alveoli•Each lung has millions of tiny air sacs
•A series of dead-ends pathways
DiaphragmLarge flat muscle under lung.
Inhalation- diaphragm moves downward to help increase chest capacity. Decreases pressure so air can flow in.
Exhalation- diaphragm relaxes and moves up to push air out.
Called NEGATIVE PRESSURE BREATHING
Inhalation and Exhalation
InhalationBreathing is involuntaryControlled by Medulla oblongata
Cells monitors CO2 levelSends nerve impulses to contract diaphragmIncrease CO2= increase impulse to breath
SmokingNicotine increases heart rate and blood
pressureIncreases CO levels in bloodBlocks transport of O2Leaves tar in lungsParalyzes ciliaSwells respiratory tract