28.05.2020 Pace Work

                                                                                                                                                                                     

                                                                                                        

Тема: Смак.

In this lesson we will learn about the sense of tasting.

 Let’s review the sound [əu]

    Repeat 

            1.go, note, rese, so, no, smoke, tone;

            2.Home is home. Be it ever so homely.

Make up the sentences with these words.

repeat the words after me:

An object

Behind

To protect

A message

A taste

Salty

sour

Pre-reading activities:

 Now try to guess what these words mean

An object – means a thing that can be seen.

Behind – means in back of another.

A message – means a letter.

To protect – means to care.

Make up the sentences with these words.

Now let’s read and translate the text. While reading underline the new words.

Taste is the ability to respond to dissolved molecules and ions.

Humans detect taste with taste receptor cells. These are clustered in taste buds and scattered in other areas of the body. Each taste bud has a pore that opens out to the surface of the tongue enabling molecules and ions taken into the mouth to reach the receptor cells inside.

There are five primary taste sensations:

salty

sour

sweet

bitter

umami

Properties of the taste system.

A single taste bud contains 50–100 taste cells representing all 5 taste sensations (so the classic textbook pictures showing separate taste areas on the tongue are wrong).

Each taste cell has receptors on its apical surface.

A single taste cell seems to be restricted to expressing only a single type of receptor (except for bitter receptors).

A stimulated taste receptor cell triggers action potentials in a nearby sensory neuron leading back to the brain.

However, a single sensory neuron can be connected to several taste cells in each of several different taste buds.

The sensation of taste — like all sensations — resides in the brain.

And in mice, at least, the sensory neurons for four of the tastes (not sour) transmit their information to four discrete areas of the brain.

 Post-reading.

 put the right word on the blank.

It is the sense of_______.

There are … primary taste sensations.

Each taste cell has receptors on its apical…

The sensation of taste — like all sensations — resides in the…

taste cells in each of several different taste…

T: answer my questions:

What is a sense of tasting?

How many taste sensation do you know?

Thank you!