Common Principles of Sensory & Motor System Flashcards Preview

Term IV: Neuro > Common Principles of Sensory & Motor System > Flashcards

Flashcards in Common Principles of Sensory & Motor System Deck (20):
1

Receptor potentials are typically ____ potentials, similar to synaptic potentials.

Graded

2

Receptor Potentials are converted into _____for Transmission to CNS

Rate Codes

3

What type of channels underlie several sensory responses?

Cation P-loop channels

4

In most cases, receptor adaptation to a sustained stimulus is a ____-regulated process

Ca2+

5

In the presence of weak stimuli, receptor is in its most _____ state

In the presence of stronger stimuli, receptor is adapted to respond only to _____ stimulus variations

sensitive

bigger

6

Give an example of a sensation we interpret from labeled lines.

Hot sensation of capsaicin

7

In many systems, the receptor is not a channel. Instead, the receptor does what?

Metabolically regulates the transduction channel

8

What leads to distinct information being sent to the CNS even though the same receptor potential generating channel is used for all stimuli?

differential expression of receptors

9

How does the brain detect different tastes?

Different neurons carry the different taste signals into the brain allowing the same transduction scheme to transmit distinct taste information

10

What is receptive field? Positive, negative, or both stimuli?

Set of stimuli that affect the firing of a sensory neuron

Both positive and negative

11

Stimuli that are focused on the ____ area of the receptive field are detected more strongly than stimuli that are _____ across the receptive field

positive

constant

12

What helps sharpen the info coming into the CNS?

Antagonistic field organization

13

Receptive field size is typically _____ related to how critical the information is for the animals survival

Inversely

Ex: Visual receptive fields are large in the periphery, but small in the fovea

14

T or F: Sensory pathways never cross over in CNS.

FALSE - most do

15

Where in the brain does sensory info enter?

cortex

16

Does the motor system receive feedback information?

YES - receives critical info about how actual mvt compares with intended mvt

17

How many motor neurons does a single muscle fiber receive input from?

ONE - all the muscle fibers together move to create a muscle mvt

18

What are the specific circuits called that coordinate motor plans?

Central pattern generators

19

Sensors in series provide info about muscle _____, while sensors in parallel provide info about muscle _____.

Forces, length

20

Reflexes are simple motor programs triggered by______

sensory inputs