Histology

One of the following is part of conducting portion of respiratory system :

• a ) Alveolar duct

• b ) Alveolar sac

• c ) Trachea

• d ) Respiratory bronchioles

Brush cells of respiratory epithelium :

• a ) Act as stem cells .

• b ) Are neuroendocrine cells belonging to APUD

• c ) Act as sensory receptors .

• d ) Push mucus with trapped bacteria and dust in one direction outwards

Concerning the histological structure of trachea :

• a ) It is lined by pseudostratified columnar ciliated epithelium with goblet cells .

• b ) Has no submucosa layer

• c ) Its fibro - cartilagenous coat contains incomplete rings of elastic cartilage

• d ) Its adventitia contains lymphoid nodules , mucous and serous glands

Concerning the larynx one of the following is CORRECT

• a ) False vocal cords are lined with simple columnar epithelium

• b ) Epiglottis , cuneiform and corniculate are small elastic cartilage

• c ) True vocal cords are lined with respiratory epithelium

• d ) False vocal cords are concerned with production of voice .

Which of the following is a part of the respiratory portion ?

• Trachea

• Larynx

• Terminal bronchioles

• Respiratory bronchioles

Which cartilage of the larynx is made elastic cartilage ?

• Thyroid cartilage

• Cricoid cartilage

• Corniculate cartilage

• All of the above

Which cell is a type of neuron ?

• Hasal cells

• Hrish cells

• Olfactory cells

• Sustentacular cells

brush cells are :

• Chemoreceptor

• One of diffuse neuro - endocrine cells ( DNES )

• Stem cells

• Secrete surfactant

T.S of trachen reveals

• Multiple plates of cartilage .

• C - shaped elastic cartilage rings ,

• No cartilage

• C - shaped hyaline cartilage rings .