BREATHING AND EXCHANGE OF GASES worksheet 2

After a forceful inspiration the amount of air that can be breathed out by maximum forced expiration is equal to :

• IRV+RV+ERV

• IRV+TV+ERV

• IRV+TV

• ERV+TV

The factor which does not affect the rate of alveolar diffusion is

• solubility of gases

• thickness of membrane

• pressure gradient

• reactivity of gases

The oxygen dissociation curve will show a right shift in case of:

• high pCO2

• high pO2

• low pCO2

• Low H+ concentration

We have the ability to increase the strength of inspiration and expiration with the help of additional muscles present in ----------

(a)  

Which of the following sequences is correct to initiate inspiration?

(i)by the contraction of diaphragm

(ii) by the contraction of external inter-costal muscles lift up ribs and sternum

(iii) increases the volume of thoracic chamber in dorso-ventral axis

(iv) Intrapulmonary pressure decreases

(v)increases the volume of thoracic chamber in antero-posterior axis

(vi)Air rushes into lungs

• (i),(ii),(iii),(iv),(v),(vi)

• (i),(ii),(iii),(v),(iv),(vi)

• (i),(v),(ii),(iii),(iv),(vi)

• (i),(ii),(iv),(iii),(v),(vi)

(a)   enzyme help in transport of carbon dioxide in Erythrocytes.

ASSERTION- Alveoli are the primary sites for exchange of gases.

REASON-All factors in our body are favorable for diffusion of oxygen from alveoli to tissues and that of carbon dioxide from tissues to alveoli.

• If both assertion and reason are true and the reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Bulk of carbon dioxide released from body tissues into blood is present as :

• Free carbon dioxide in blood plasma

• carbaminohaemoglobin in RBC

• Bicarbonate in blood plasma and RBC

• 70% carbaminohaemoglobin and 30% as bicarbonate

Dissociation of oxyhaemoglobin can be promoted by

• low pCO2

• High pCO2

• High blood pH

• Low body temperature

After deep inspiration, maximum expiration of lungs is called

• TLC

• IC

• EC

• VC