sense of smell detects the presence of chemical substances in the air its sensory organ is the nose n.
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1.3 SENSE OF SMELL. Sense of smell detects the presence of chemical substances in the air. Its sensory organ is the nose . Structure of Human NOSE. Sinus. Nasal cavity. Nostril. Sinus. Opening of auditory nerve. Hard palate. Nasopharynx. Oral cavity. Uvula. Tongue. Tonsil .

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slide2

Structure of Human NOSE

Sinus

Nasal cavity

Nostril

Sinus

Opening of auditory nerve

Hard palate

Nasopharynx

Oral cavity

Uvula

Tongue

Tonsil

Pharynx

Epiglottis

Glottis

Vocal cords

Larynx

Esophagus

Trachea

slide3

Structure of Human NOSE

In the nasal cavity, there are :-

a. Sensory cellsto

detect smell

b. Glandular

cells

which

secrete

mucus

Smell receptors : Olfactory bulb

Hard palate

Olfactory Nerve Fibres

slide5

Detection of Smell

Certain smells are more easily detected than others. For instance smell of durian is more easily detected than the smell of watermelon.Do you know why?