Gaseous Exchange

(NB!!! Click on the down arrow to see the other options).

1.) The diaphragm

supports the ribs is used in breathing movements encloses the liver separates liver and stomach is a solid sheet with no passage through it.

2)Which of these is NOT a passage for air ?

pharynx glottis epiglottis trachea larynx

3) Which of the following has a particularly rich blood supply ?

alveolus trachea bronchus diaphragm pleural membrane

4) The cartilage of the air tubes starts to disappear in the

bronchus trachea larynx alveolus bronchiole

5)Cilia are lacking in the

nasal cavity bronchiole trachea alveolus bronchus

6)The rate of breathing is regulated by the medulla of the brain mainly

according to the level of oxygen in the blood under voluntary control according to the carbon dioxide level of the blood according to the arterial blood pressure according to the venous blood presure

7)After a sprint race an athlete pants at ninety times a minute for several minutes. He does this

to get rid of excess carbon di-oxide in his body to draw cool air into his lungs to pay off an oxygen debt while the pulse slows down while the breathing centre of the medulla is readjusting to the race having been finished

8)Which of these statements is incorrect concerning the oxygen transported in the mammal body?

more oxygen is present in the pulmonary vein than the pulmonary artery less oxygen is present in the pulmonary vein than the pulmonary artery most oxygen is bonded to haemoglobin in red blood cells some oxygen is dissolved directly in the blood plasma

9)The opening at the epiglottis is closed while a person?

swallows speaks chews breathes snores

10) The incomplete rings of cartilage in the trachea of a mammal allow the trachea to

increase and decrease in width bend and stretch produce sounds for speach be closed by the epiglottis trap dust which might damage the lungs

11)The diaphragm is mainly

smooth muscle voluntary muscle skeletal muscle tendon tissue ligament tissue

alveoli and pleura lungs and the stomach the two tracheae two pleuras bronchus and diaphragm

13)Air moves into the lungs due to the

atmospheric pressure pushing it moving diaphram pulling it movement of the abdominal walls elastic nature of the lung increased lung volume pulling it

14) Which of the following does not occur during expiration?

muscles in the diaphram relax diaphram moves upwards external intercostal muscles relax ribs move downwards the space around the lungs enlarges

15) The breathing rate is largely determined by the quantity of

Oxygen in the expired air bronchioles carbon dioxide in the blood haemoglobin in the tissues blood capillaries around the alveoli