Sensory receptor and nerve message

Question 1

Different types of sensory receptors

Answer 1

We can distinguish 2 types of sensory receptors:

1) the exteroceptors that bring information from the external medium (sound-light)
2) the interoceptors that bring information from the internal medium (blood pH, Temp, glycemia, arterial pressure..)

Question 2

We can classify the receptors according to the kind of stimulus they are sensitive to, classify.

Answer 2

1) Mechanoreceptors: sensitive to pressure, touch and stretching; they are found at the level of the muscles and blood vessels
2) Thermoreceptors: sensitive to the variations of temperature(hot and cold), they are found at the level of the retina of the eye
3) Light receptors: sensitive to the variations in light intensity, they are found at the level of the retina of the eye
4) Nociceptors: sensitive to pain, they are found at the level of the skin
5) Chemoreceptors: sensitive to certain chemical substances, they are found at the level of the tongue and nose

Question 3

what is a receptor potential?

Answer 3

Receptor potential is a local non-propagable depolarization whose amplitude depends on the intensity of stimulus

Question 4

What is a generator potential?

Answer 4

The generator potential always begins by an initial hypopolarization that reaches the depolarization threshold (50 mv), its amplitude is always constant and maximum
(100 mv). Its frequency depends on the intensity of the stimulus. It propagates under the form of an action potential of the same amplitude and frequency.