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Hello, welcome to this new unit.

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After you have studied the nervous and endocrine system,

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all the coordination centers in our body,

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let's go in to see how we receive the information from the outer world.

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Unit number 8, sensory receptors.

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On our first point, we're going to talk a little bit of the different types of receptors

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that we have in our body.

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Point number 1, sensory receptors.

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In class, I'm just going to give you a photocopy, in fact, a photocopy with two circles.

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In these two circles, we're going to make a flap, something like this, so we're going

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to leave a space here in the middle, we're going to make flaps that open and close.

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As you have seen, in the outer circle we have a rectangle which says sensory receptor, underneath

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we are going to write the definition of it.

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Sensory receptors, specialized neurons capable of transducing sensory stimuli into nerve

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impulses.

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Underneath the flap that says according to the stimulus they receive, you should have

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something like that photoreceptor mechanoreceptor chemoreceptors and thermoreceptors also there's

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a middle line here we have here stimuli location what are we gonna write here we're gonna write the

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different information about what stimuli the photoreceptor received what location the

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photoreceptor have uh what stimuli the chemoreceptor received what location the chemoreceptors have

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The photoreceptors, as you could guess, they are our eyes, so location is the eye, and the stimuli is the light that we receive from the outer wall.

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Mechanoreceptors are going to receive mechanical stimuli from the outer wall.

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What are mechanical stimuli?

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Our stimuli that include pressure, contact and sound. Sound is also a mechanical stimuli.

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What are the organs or the places in our body that are going to have these receptor cells?

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We have the skin, our muscles, the joints. Remember that the joints in Spanish are articulaciones.

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they are the parts that join the muscle with the bones, and also the ear for the sun.

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The chemoreceptors are going to identify chemical changes, chemical molecules that are around,

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and they are going to stimulate certain parts of our body, like our mouth and our nose.

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So, flavor and smells are chemical stimuli.

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Thermoreceptors detect the temperature, if it's cold, if it's hot and all the temperatures in between.

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The part of our body that detects this is our skin.

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On the lower part of our flag, here the bottom part, you should have the part that says according to the location.

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We have two different types depending on where these receptor cells are located.

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they can be internal receptors or external receptors internal receptors

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will be located in internal organs imagine for example that I feel stomach

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ache I feel pain okay I feel pressure for example because I have ate a lot and

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my stomach is moving a lot then I have internal receptors to have these

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feelings whereas external receptors they are going to be located on the surface

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of the body so all the skin receptors are external the eyes the ears will be

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internal we have different examples here of internal and external receptors

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Ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha.