Chapter 1 (1.2 : Nose)

Question 1

What are nostrils?

Answer 1

Two holes in our nose

Question 2

What is the nostrils open to?

Answer 2

Nasal cavity

Question 3

What are the characteristics of nasal cavity?

Answer 3

Has a mucous lining that warms and moistens the air that enters the nose

Question 4

What does the roof of the nasal cavity contain?

Answer 4

Smell receptors, called olfactory cells

Question 5

What is the function of olfactory cells?

Answer 5

Detect the smell in the air that enters the nose

Question 6

Why is the olfactory cells located at the roof of nasal cavity?

Answer 6

Allows the maximum exposure to the air that enters the nasal cavity

Question 7

Why does a person with flu have a poor sense of smell?

Answer 7

When a person has flu, the receptors are covered with a lot of mucus, this prevents the receptors from being stimulated by the chemicals

Question 8

State the order of how smells are sensed.

Answer 8

1.When air passes through the nasal cavity, the chemical substances in the air dissolve in the mucous lining.
2.The dissolved chemical particles stimulate the smell receptors.
3.The smell receptors produce nerve impulses.
4.These impulses are sent to the brain to be interpreted as smells.