Sensory Nervous System

Question 1

Neuronal Cells

Answer 1

transmit electrical ad chemical signals,, 3 body parts of soma, dendrites, axon- electrically excitable, sensory, motor, interneurons

Question 2

Non-neuronal (glia) cell

Answer 2

provide support, protection, nourishment, many different kind -do not generate AP -communicate with each other

Question 3

Single Sensory Receptors

Answer 3

detect specific types of stimulus, single celled
-photoreceptors, mechanoreceptors, thermoreceptors

Question 4

Complex Receptors

Answer 4

multiple cell types, multiple components of sensory cells, accessory structures and supporting cells
-taste buds, inner ears -allows multiple types of sensory info to be integrated and specialized

Question 5

6 categories of sensory receptors

Answer 5

Mechano-respond to mechanical deformation (stretch)
Thermo-respond to cold and heat
Nocio- respond to pain (tissue damage)
Electromagnetic- respond to electrical magnetic fields, infrared and ultraviolet light
Photo- respond to visible light
Chemo- respond to various chemicals

Question 6

Receptor potential:

Answer 6

produced from stimuli after ion movement across membrane: alters rate at which AP is generated in axon hillock

Question 7

Mechanoreceptors

Answer 7

stretch receptors: common in invertebrates and vertebrates -detect relative position of body structure
-mechanically gated Na+ channels

Question 8

Hair cells

Answer 8

receptor cell with stereocilia to detect fluid currents

Question 9

Phototransduction

Answer 9

rods and cones

Question 10

Chemoreceptors

Answer 10

taste, salt and sour simple

Question 11

Thermoreceptors

Answer 11

temperature infrared, pit organs and crotalid snakes

Question 12

Electroreceptors

Answer 12

electric field, electric fish