1.Which of the following is a function of the nose in the respiratory system?
    a.Filtration           b. warming
    b.Humidifying      c. all of the above
2.The _______________ prevents food from entering the respiratory system?
    a.Pharynx                  c. larynx
    b.Glottis                     d. epiglottis
3.The lung is made mostly of _______________.
    a.Bronchi                   c. bronchioles
    b.Alveoli                    d. none of the above
4.The thoracic cavity is separated from the abdominal cavity by a
    a.Diaphragm                    c. ribs.
    b.surfactant.                      d. none of them
5.What part of the brain is responsible for regulation of respiration?
    a.cerebral cortex                 c. medulla
    b.cerebellum                      d. hypothalamus
6.Breathing is triggered in the medulla by the concentration of _______________.
    a.Oxygen            c. chlorine ion
    b.carbon dioxide         d. none of the above
7.The innermost chamber of the respiratory system into which air can be drawn is
    a) Branchiole          b) Branchus            c) Air sac
    d) Branchial tube          e) Sinus
8.The pleura is
    a)  a membrane that surrouds the lungs      
    b) The respiratory surface of human   
    c) one of the air passages to the lungs
    d) the membrane lining the air passages
9.The exchange of gases occurs between----------and -------------
        a) Alveoli – Blood      b)Trachea – Alveoli   
     c) Brachioles – Blood            d) Blood – Branchus              e) Alveoli – Arteries
10.The process by with gases are exchange in the alveoli of our lungs is called:
       a)external respiration   b)indirect respiration
       c)direct respiration    d) internal respiration    e) All of them
11.Which is not a respiratory structure?
    a.Bronchi              c. Bronchioles
    b.Toque                 d. Larynx
12.What is the aim of respiration?
    a.to produce oxygen (O2)
    b.to take carbon dioxite (CO2)
    c.to take O2 and give  out CO2
    d.No one
13.The exchange of CO2 and O2 occurs between ______  and______.
    a.Alveoli and capillaries
    b.Alveoli and pulmonary vein
    c.Alveoli and pulmonary artery
    d.Pulmonary artery and pulmonary vein

14.The vocal cords are found in the
    a.Pharynx             c. Trachea
    b.Larynx                d. Mouth
15.The path of air in the human respiratory system is from nasal cavity to
    a.larnyx to pharnyx  to trachea to bronchus to bronchiole to alvoeli
    b.pharnyx to trachea to larnyx to bronchus to alvoeli to bronchiole
    c.larnyx to pharnyx to bronchus to bronchiole to alvoeli to trachea
    d.trachea to bronchus to bronchiole to larnyx to pharnix to alvoeli
    e.pharnyx to larnyx to trachea to bronchus to bronchiole to alvoeli
16.The pleura.
    a)is the membrane that surrounds the lungs
    b)is the respiratory surface of humans
    c)is one of the air passages to the lungs
    d)is a membrane lining the air passages.

17.most CO2 is carried in the plasma
in the form of
    a)hydrogen ions     b) lactic acid       c)oxyhemoglobin
        d)bicarbonate ions(HCO3)           e)dissolved CO2

18.the exchange of gases (CO2,O2) occurs  between ………and…………
    a) Alveoli and blood       b)trachea and  alveoli 
    c    ) bronchioles      d)blood and  broaches
     e)alveoli and arteries

19.In human cell respiration wich important system works to remove the need of oxygen and to refine the carbon dioxide?
    a)Respiration and skeleton
    b)Endockrine and tissue
    c)Transport and respiration
    d)Tissue and nerve
    e)Nerve and enockrine.
20.The bronchus subdivides into smaller branches called:
     a). trachea b). larynx c). alveoli d). bronchioles e). bronchi