What makes smell unusual among the senses?

It links directly to emotion and memory areas

It is processed only in the eyes

What is the Proust effect?

A smell suddenly bringing back a memory

How does smell affect flavor?

Much of flavor comes from smell

What is special about smell neurons?

They are replaced throughout life

How many smells can humans tell apart?

A huge number, perhaps many thousands or more

Sense of Smell Quiz: Olfactory Receptors and Scent Pathways

This sense of smell quiz follows a scent from the air to the brain. Play 10 interactive questions on olfactory receptors, the olfactory epithelium, the olfactory bulb, the direct route to emotion and memory, the Proust effect, the 2004 Nobel Prize, how many smells we detect, flavor, regrowing neurons and losing smell.

Start Sense of Smell Quiz

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Where
Where are smell receptors located?
Count
About how many types of smell receptors do humans have?
Bulb
Where do smell signals go first in the brain?
Emotion
What makes smell unusual among the senses?
Proust
What is the Proust effect?
Nobel
Who won the 2004 Nobel Prize for discovering smell receptor genes?
Flavor
How does smell affect flavor?
Regrow
What is special about smell neurons?
Loss
What is anosmia?
Many
How many smells can humans tell apart?

Explanations: answer key for all 10 questions

Q1: Where are smell receptors located?
Answer: High in the nasal cavity
They sit in the olfactory epithelium.
Q2: About how many types of smell receptors do humans have?
Answer: About 400
Combinations create many smells.
Q3: Where do smell signals go first in the brain?
Answer: The olfactory bulb
It sits just above the nose.
Q4: What makes smell unusual among the senses?
Answer: It links directly to emotion and memory areas
Smells can trigger vivid memories.
Q5: What is the Proust effect?
Answer: A smell suddenly bringing back a memory
It is named after a novelist.
Q6: Who won the 2004 Nobel Prize for discovering smell receptor genes?
Answer: Linda Buck and Richard Axel
They found a large gene family.
Q7: How does smell affect flavor?
Answer: Much of flavor comes from smell
Food tastes flat with a blocked nose.
Q8: What is special about smell neurons?
Answer: They are replaced throughout life
New ones grow every few weeks.
Q9: What is anosmia?
Answer: Loss of the sense of smell
Colds and viruses can cause it.
Q10: How many smells can humans tell apart?
Answer: A huge number, perhaps many thousands or more
Estimates vary widely.

Sense Of Smell Quiz – Olfactory Receptors and Scent Pathways

Smell begins when odor molecules reach receptors high in the nasal cavity. Humans have about 400 types of smell receptors, and different combinations let us detect a huge range of scents.

Signals travel to the olfactory bulb and then link directly to brain areas for emotion and memory. That is why a smell can suddenly bring back a vivid memory, sometimes called the Proust effect.

Linda Buck and Richard Axel won the 2004 Nobel Prize for finding the smell receptor genes. Much of what we call flavor comes from smell, smell neurons are replaced throughout life, and losing smell is called anosmia.

What This Quiz Teaches

Biology fans will enjoy these questions.

Where smell receptors are
How signals travel
Why smells trigger memories
How smell shapes flavor
What can go wrong

Did You Know?

Dogs have far more smell receptors than humans.
Smell training can help some people recover after illness.
Babies recognize their mothers by scent.
Smell often weakens with age.
Perfumers train their noses for years.