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Shark Nose and Underwater Smell

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment explaining how sharks smell under water, and the similarities between our sense of smell and theirs.

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It's really too bad Bianca couldn't make it, but I'll be sure to take really good notes for her. 00:00:00
Hey look, this is a cool aquarium. 00:00:04
Hey guys, come on over here. 00:00:06
My name's Beth Fershaw, I'm a curator here at the Virginia Marine Science Museum. 00:00:08
Dr. Schechter told me you'd be coming. 00:00:12
What's this? 00:00:14
This is the seal habitat, but I bet you guys want to see the shark aquarium. 00:00:16
Come on inside, let's check it out. 00:00:19
Maybe that big nose can help us work through this stink problem. 00:00:23
We're learning a lot about smells. 00:00:26
We visited Dr. Schechter and he told us how our noses work. 00:00:28
Maybe you and these sharks can help us learn more about smells. 00:00:31
We know that some chemical compounds have smells to them 00:00:35
and our noses have special cells that can receive those smells. 00:00:38
That's right, those cells are called olfactory chemoreceptors and sharks have them too. 00:00:41
Now if you live out of the water like you and me, the air carries the smell to our noses. 00:00:46
If you live in the water like the sharks, the water carries the smell. 00:00:51
What? 00:00:56
What this means is, is that animals, like those sharks, have a sense of smell, even under water. 00:00:57
Does this mean that sharks have a better sense of smell than we do? 00:01:03
So they can smell hamburgers better than me? 00:01:07
Well, not exactly. 00:01:10
Their sense of smell is tuned to the smells that help them survive in the wild. 00:01:12
They're top predators and being able to smell their prey is very important. 00:01:15
Did you know that the shark's brain is devoted mostly to its sense of smell? 00:01:20
So when it comes to smelling, sharks really know how to get to the bottom of the stinky stuff. 00:01:24
Take a long look at this shark's nose. 00:01:29
Did you know that it can sniff out one drop of blood in 25 gallons of water? 00:01:31
I guess we better go back and piece this all together. 00:01:37
See you later. 00:01:40
Thanks a lot. 00:01:41
Thanks for helping us. 00:01:41
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Idioma/s:
en
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
296
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
01′ 45″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
10.60 MBytes

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