BREATHING AND EXCHANGE OF GASES

STUDENT NAME :

Conduction part of the respiratory system is formed :

• from external nostrils up to the alveoli
• from external nostrils up to the terminal bronchioles
• from external nostrils up to the duct of alveoli
• from external nostrils upto the alveoli

primary site for gaseous exchange in humans :

• nostrils
• endothelium
• alveoli
• deoxygenated blood

air pathway in conducting zone :

• trachea->lungs->larynx->pharynx->alveoli
• nose->larynx->pharynx->bronchus->alveoli->bronchioles
• nostrils->pharynx->larynx->trachea->bronchi->bronchiles->alveoli
• nose->mouth->lungs

lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because :

• there is positive intrapleural pressure
• pressure in the lungs is higher then the atm. pressure
• there is a -ve pressure in the lungs
• there is -ve intrapleural pressure pulling at the lungs walls

epithelium present in the trachea is :

• ciliated cuboidal epithelium
• pseudostratified ciliated coloumnar glandular epithelium
• pseudostratified epithelium
• ciliated coloumnar epithelium

part of pharynx which open in the nasal cavity:

• internal nares
• nasopharynx
• oropharynx
• none

C shaped cartilagenous rings are absent in :

• initial bronchioles
• respiratory bronchioles
• terminal bronchioles
• both b and c

most abundant cartilage of larynx :

• cricoid cartilage
• artenoid cartilage
• hyaline cartilage
• none

number of lobes present in human lungs :

• 3 in right lung and 2 in left lung
• 2 in right lungs and 3 in left lung
• 2 in right lungs and 2 in left lung
• 3 in right lung and 1 in left lung