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Flashcards in Sensory Receptors 1 Deck (20):
1

Define sensory receptors.

Nerve endings, often with specialised non-neural structures.

2

Define sensory modality.

A type of stimulus activating a particular response.

3

Define adequate stimulus.

The type of energy a receptor responds to.

4

Define sensory receptors.

Highly sensitive to one specific energy but can be activated by other energies.

5

Define mechanoreceptors.

Stimulated by mechanical stimuli i.e pressure.

6

Define proprioceptors.

Mechanoreceptors in joints and muscles that signal information related to body or limb position.

7

Define nociceptors.

Respond to pain stimuli.

8

Define thermoreceptors.

Detect cold and warmth.

9

Define chemoreceptors.

Detect chemical changes.

10

Define photoreceptors.

Respond to particular wavelengths of light.

11

What does transduction involve in all sensory receptors?

Opening and closing of ion channels.

12

Adequate stimulus causes a ______ potential change which is membrane ______.

Grade, deformation.

13

What is frequency coding of stimulus intensity?

When a larger stimulus gives a larger receptor potential and therefore increases frequency of action potentials in a sensory nerve.

14

Define pacinian corpuscle.

A myelinated nerve with a naked nerve ending, enclosed by a connective tissue capsule of layered membrane lamellae.

15

When do pacinian corpuscles respond?

When a mechanical stimulus deforms the capsule and nerve ending.

16

What activates a somatic sensory neuron?

Stimuli in a specific area (receptive field).

17

Sensory neurons with neighbouring receptive fields exhibit ______ ______.

Neuronal convergence.

18

What does convergence allow?

Simultaneous sub-threshold stimuli to sum at the secondary neuron, initiating action potentials.

19

Define activity.

The ability to locate a stimulus on the skin and differentiate it from another closeby.

20

What does lateral inhibition help with?

The precision of knowing where the skin is being touched.