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Cold-blooded and warm-blooded animals - Contenido educativo
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Se definen, en inglés, los animales de sangre fría (ectotermos) y de sangre caliente (endotermos), así como las ventajas y desventajas de cada uno.
In this video we are going to learn about cold-blooded and warm-blooded animals.
00:00:00
Cold-blooded animals are those that have a body temperature that is the same as the temperature of the environment.
00:00:08
For instance, this snake is in a place at 10 degrees Celsius.
00:00:15
This means the body temperature of the snake will be also 10 degrees Celsius.
00:00:21
If I take the snake to a place at 50 degrees,
00:00:26
now the snake will change the body temperature,
00:00:31
it will be affected by the environment,
00:00:35
and with time the snake will also be at a body temperature of 50 degrees.
00:00:37
But then this means that the snake,
00:00:42
being at the same temperature as the environment,
00:00:46
may be extremely warm.
00:00:49
So, cold-blooded animals have a body temperature like that of the environment, and this means they are not always cold.
00:00:52
This means cold-blooded is not an appropriate term for these animals.
00:01:01
Scientists prefer to call them ectotherms.
00:01:05
Ecto means outside.
00:01:09
This means the temperature of these animals is like the temperature of the outside.
00:01:12
Most animals are ectotherms.
00:01:17
The animals that are not ectotherms are birds and mammals.
00:01:20
Birds and mammals are warm-blooded animals.
00:01:27
Warm-blooded means that their body temperature may be different from the temperature of the environment.
00:01:31
So, as an example, here we have an eagle in a place at a temperature of 10 degrees Celsius.
00:01:41
But the body temperature of the eagle is going to be 40 degrees.
00:01:48
That is the normal temperature for a bird, 40 degrees.
00:01:53
It does not matter it is in a place at 10 degrees Celsius.
00:01:57
It is a warm-blooded animal and it means its body may keep a temperature independent from the place.
00:02:02
So if the place is at 10 degrees, the body temperature may still be at 40 degrees.
00:02:09
If I take the eagle to a place at 50 degrees, the eagle is able to keep its body temperature.
00:02:17
This means the body temperature of the eagle will stay at 40 degrees.
00:02:25
Even if the place is at 50 degrees, the eagle keeps a body temperature of 40 degrees
00:02:30
because these animals may keep a temperature different from that of the environment.
00:02:37
This means that scientists prefer to call warm-blooded animals endotherms.
00:02:44
Endo means inside, so the temperature does not depend on the outside, it only depends on the inside.
00:02:53
And, as I said before, the only animals that are endotherms are birds and mammals.
00:03:03
Now, what is the advantage and disadvantage of all this?
00:03:10
So, endotherms, and remember this means birds and mammals, always have a very good body temperature.
00:03:18
They have the body temperature that they need.
00:03:26
In case of birds, they need 40 degrees and their body is always at 40 degrees.
00:03:28
We mammals do not need such high temperature.
00:03:33
For us, 36-37 degrees is okay.
00:03:37
So these animals, birds and mammals, always have a very good body temperature but the problem is that this requires a lot of energy.
00:03:41
Birds and mammals need a lot of energy and this means they need a lot of food.
00:03:50
Birds and mammals need a lot of food.
00:03:56
The animals that are cold-blooded and the proper term is ectotherms, this means all the other animals that are not birds and mammals,
00:03:59
These animals, the ectotherms, need to be in an environment with the appropriate temperature.
00:04:08
Since their temperature cannot be different from that of the environment,
00:04:15
what they do is they move to the environment that has the appropriate temperature.
00:04:20
If they do not find such an environment, they will not have a good temperature.
00:04:24
Perhaps their body will not be able to move properly, because the cells will not be at a good temperature.
00:04:28
But they have an advantage. The advantage is that they consume very little energy.
00:04:34
And this means that they need much less food in comparison to endotherms.
00:04:40
So the eagle is an endotherm. It is a warm-blooded animal. It needs a lot of energy.
00:04:47
Its temperature is always good, independently from the temperature of the environment.
00:04:55
But it needs a lot of food. Eagles need to eat every day.
00:05:00
The snake is a cold-blooded animal. The snake is an ectothern.
00:05:04
This means it needs to move to the appropriate environment always to have a good temperature.
00:05:09
But it consumes very little energy.
00:05:17
Snakes need very little food. Many snakes eat only once every three months.
00:05:20
only okay so the eagle needs to eat every day the snake does not need to eat
00:05:27
every day if there is no food the eagle is going to die much earlier than the
00:05:34
snake
00:05:41
- Idioma/s:
- Idioma/s subtítulos:
-
- Autor/es:
- Andrés Gaytán de Ayala Alonso
- Subido por:
- Andrés G.
- Licencia:
- Reconocimiento
- Visualizaciones:
- 20
- Fecha:
- 17 de octubre de 2020 - 10:47
- Visibilidad:
- Público
- Centro:
- IES AGORA
- Duración:
- 05′ 43″
- 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:
- 598x450 píxeles
- Tamaño:
- 7.80 MBytes
