Exam2: Sensory Systems

Question 1

What is the basis for all conscious & subconscious perception?

Answer 1

Flow of Na⁺ into sensory cell (ie. a graded potential) is the basis for all conscious & subconscious perception

Question 2

The brain decides the _______ and the ______ of the stimulus.

Answer 2

The brain decides the importance** and the **type of (the) stimulus

Question 3

___________ of stimulus translated into #AP/unit time

Answer 3

Intensity of stimulus translated into #AP/unit time

Question 4

__________ of stimulus translated into how long signaling continues

Answer 4

Duration of stimulus translated into how long signaling continues

Question 5

Every stimulus is interpreted as a particular type only because of what?

Answer 5

Every stimulus is interpreted as a particular type only because of where neural pathway ends in the brain

Question 6

Describe and show diagram of the

Somatic Sensory Pathway

Answer 6

Pathways: stimulation of primary (1^o) sensory neuron àsynapse with secondary (2^o) interneurons in spinal cord àwhich synapse with tertiary (3^o) neurons in thalamus (midbrain), which project to somatosensory cortex

Question 7

Fast pain is governed by what?

Answer 7

Fast governed by A(lowercase delta) fibers (myelinated)

A(lc. delta) used for location of pain

Question 8

Slow pain is governed by what?

Answer 8

Slow pain is governed by C fibers (unmyelinated)

C fibers for emotional response & attention to pain (~70% of nociceptors in body are C fibers)