science 1.2 ( nose )

Question 1

Smells are

Answer 1

chemical substances present in the air

Question 2

Sensory cells for smell are

Answer 2

tiny and covered with a layer of mucus

Question 3

How can smell be detected?

Answer 3

1. When inhale , the chemical substances in the air will dissolve in this layer of mucus
2. the sensory cells for the smell will be stimulated to produce nerve impulses.
3. nerve impulses are then sent to the brain to be interpreted to determine the type of smell