0:00:02 > 0:00:03BELL RINGS
0:00:03 > 0:00:05OK, Jonathan, everything is set for our special guest.
0:00:05 > 0:00:08It's so exciting that your mother is coming to visit, Colin!
0:00:08 > 0:00:13I bet she's just like you, is she? Are you the exact same in every way?
0:00:13 > 0:00:17Actually, there's something about my mother you should probably know.
0:00:17 > 0:00:19ENGINE ROARS
0:00:19 > 0:00:21Hiya, Colly-wolls!
0:00:21 > 0:00:23LOUD ROCK MUSIC PLAYS
0:00:29 > 0:00:32Oh, sorry about the wall!
0:00:32 > 0:00:37- Ah, hello, Mother.- Heh-heh! This is going to be fun.
0:00:37 > 0:00:38BELL RINGS
0:00:38 > 0:00:39Visitors, everyone!
0:00:39 > 0:00:42This is Brain Freeze!
0:00:42 > 0:00:44With Dr Knowles...
0:00:44 > 0:00:47Professor McCork...
0:00:47 > 0:00:50Colin the floor manager...
0:00:50 > 0:00:52And Mrs Hucklebuck.
0:00:52 > 0:00:54Stand back!
0:00:54 > 0:00:56Come on, everybody!
0:00:59 > 0:01:04It's time for Today's Big Question!
0:01:04 > 0:01:08Today we're asking:
0:01:08 > 0:01:11- Saliva...- Or spit.
0:01:11 > 0:01:14Saliva is produced by glands in our mouths,
0:01:14 > 0:01:18and one of its many roles is to help us taste food.
0:01:18 > 0:01:21As we eat, saliva begins to dissolve and break down our food
0:01:21 > 0:01:22into its chemical components,
0:01:22 > 0:01:25which stimulate sensory cells in our taste buds.
0:01:25 > 0:01:28From up here, nerve impulses are sent to the part of the brain
0:01:28 > 0:01:29that recognises taste,
0:01:29 > 0:01:32which when combined with our sense of smell
0:01:32 > 0:01:33allows us to experience flavour,
0:01:33 > 0:01:37which in turn stimulates even more saliva production in our mouths.
0:01:37 > 0:01:40- Dr Knowles, I wonder how much spit...- Saliva!
0:01:40 > 0:01:44Sorry, saliva...a person makes in their whole life?
0:01:44 > 0:01:45Over an average lifetime,
0:01:45 > 0:01:49a human will produce enough saliva to fill at least 60 bath tubs.
0:01:49 > 0:01:5360 bath tubs. That's a whole lot of globby mess!
0:01:53 > 0:01:56Urgh! Charming. Back after these.
0:01:58 > 0:02:02Oh, I've been all over, me. Sahara Desert, Great Wall Of China,
0:02:02 > 0:02:05Grand Canyon - you name it, I've been there.
0:02:05 > 0:02:09Heh! And you barely leave the studio, do you, Colly-wolls?
0:02:09 > 0:02:11Yeah - how come you guys are so different?
0:02:11 > 0:02:15- Well...- Oh, it's all a matter of taste. I'm a free spirit, me.
0:02:15 > 0:02:19- Always have been.- And I'm a home bird. Always will be.
0:02:19 > 0:02:23Well, I love the fact that two people can be so different
0:02:23 > 0:02:26yet still get along so well.
0:02:26 > 0:02:29And I love that fact that Colin's mammy drives a Black Shadow.
0:02:29 > 0:02:31It's so shiny!
0:02:31 > 0:02:32BELL RINGS
0:02:32 > 0:02:34Well, it's my time to shine, Mother.
0:02:34 > 0:02:38We're back in five, four, three...
0:02:43 > 0:02:45So tell us, Dr Knowles,
0:02:45 > 0:02:49- why do we make spit...- Ah!- ..sorry, saliva when we eat something tasty?
0:02:49 > 0:02:53Without saliva to break down food into its chemical components,
0:02:53 > 0:02:57it would be difficult to experience the five basic tastes.
0:02:57 > 0:02:59Sweet, like sugar.
0:02:59 > 0:03:01Salty, like table salt.
0:03:01 > 0:03:02Sour, like lemon juice.
0:03:02 > 0:03:04Bitter like cocoa powder.
0:03:04 > 0:03:07Or savoury like soy sauce.
0:03:09 > 0:03:13And all because of spit - sorry, saliva - and some tiny taste buds.
0:03:13 > 0:03:15Lots of taste buds, actually.
0:03:15 > 0:03:20We each have been 5,000 and 10,000 taste buds in our mouths,
0:03:20 > 0:03:24and some people known as super tasters have even more!
0:03:24 > 0:03:27I wonder if I'm a super taster? Let me count.
0:03:27 > 0:03:29One, two, three, four...
0:03:29 > 0:03:31Oh! See you next time, folks!
0:03:34 > 0:03:37- Now, remember to drive safely, Mother.- I will.
0:03:37 > 0:03:39- And to drink lots of water.- Will do.
0:03:39 > 0:03:41And don't forget your five a day!
0:03:41 > 0:03:45Don't you worry about me, Colly-wolls. I'll be just fine.
0:03:45 > 0:03:48Mwah! Bye, everyone!
0:03:48 > 0:03:50- See you soon!- Send us a postcard!
0:03:50 > 0:03:52See you later, lads.
0:03:52 > 0:03:53What's going on?!
0:03:53 > 0:03:57Ah, you know me, Colin - I'm a bit of a free spirit myself, me. Hup!
0:03:57 > 0:03:59Let's rock and roll!
0:03:59 > 0:04:02- Oh!- Sorry about the wall!
0:04:03 > 0:04:05Ah, goodbye, Mother.
0:04:08 > 0:04:11Subtitles by Ericsson