Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
The tongue is a muscular sensory organ that helps us identify flavors, move food around the mouth, and speak.
The surface of the tongue is covered with tiny bumps called papillae, which contain clusters of nerve endings known as taste buds.
There are four primary tastes recognized by the tongue: Sweet, Salty, Sour, and Bitter. A fifth taste called 'Umami' (savory) is also recognized.
Saliva, which is mostly composed of and enzymes, helps in dissolving food particles so that the taste buds can detect them.
The sense of taste and the sense of smell work together to create the perception of flavor. If the nose is blocked (as during a cold), food often feels tasteless.
Digestion begins in the mouth where food is chewed and mixed with saliva to form a soft mass called a bolus.
📐Formulae
💡Examples
Problem 1:
Why is it difficult to taste a piece of sugar if your tongue is completely dry?
Solution:
The taste buds can only detect chemicals that are dissolved in a liquid.
Explanation:
Saliva (containing ) acts as a solvent. Without moisture, the chemical molecules in the sugar cannot reach the taste receptors inside the taste buds.
Problem 2:
Which part of the tongue is generally most sensitive to bitter tastes?
Solution:
The back part of the tongue.
Explanation:
While taste buds are spread across the tongue, different areas have higher sensitivities; the back of the tongue is particularly sensitive to bitterness to act as a safety mechanism against swallowing toxic substances.
Problem 3:
Explain the role of the nose in tasting a delicious meal.
Solution:
The nose detects the aroma of the food, which the brain combines with signals from the tongue.
Explanation:
About of what we perceive as 'flavor' actually comes from our sense of smell. When we chew, odorous molecules travel to the olfactory receptors in the nose.