When you inhale, the diaphragm…….
a) relaxes and moves upward
b) relaxes and moves downward
c) contracts and moves upward
d) contracts and moves downward
With which other system do specialized respiratory systems most closely interface in exchanging gases between the cells and the environment?
a) the skin
b) the excretory system
c) the circulatory system
d) the muscular system
Which of the following is the respiratory surface in human respiratory system?
a) larynx
b) trachea
c) bronchi
d) alveoli
How is most of the oxygen transported in the blood?
a) dissolved in plasma
b) bound to Haemoglobin
c) as bicarbonate ions
d) dissolved in water
The lateral walls of the chest cavity of man are composed of the …….
a) ribs
b) intercostals muscles
c) ribs and intercostals muscles
d) ribs, intercoastal muscles, and diaphragm
Which of the following factors is the most effective in accelerating the rate of breathing in man?
a) a lack of oxygen in the blood
b) a lack of oxygen in the tissues
c) an excess of CO2 in the lungs
d) an excess of CO2 in the blood
