Unit 3: Nervous System/sensory System

Front 1

Sensory System

Back 1

Protects a person by detecting changes in the environment

Front 2

Stimulus

Back 2

Can be an environment change that initiates a nerve impulse

Front 3

Sensory receptor

Back 3

Part of the nervous system that detects a stimulus

Front 4

Examples of sensory receptor

Back 4

free dendrite of a sensory neuron (pain and temp)
modified endind (end-organ) on the dendrite of an afferent neuron (touch)
Rods and cones of the eye's retina

Front 5

Receptors can classified according to type of stimulus to which they respond

Back 5

Chemoreceptors (taste, smell)
Photoreceptors (light)
Thermoreceptors ( temperature)
Mechanoreceptors (movement i.e. stretch, pressure, vibrations)

Front 6

Threshold Stimulus

Back 6

stimulus of adequate intensity to have a response and generate nerve impulse

Front 7

Special sense

Back 7

localized in a special sense organ

Front 8

General sense

Back 8

widely distributed throughout the body

Front 9

Special Senses

Back 9

Vision (receptors in the eye)
Hearing (internal ear)
Equilibrium ( internal ear)
Taste (tongue)
Smell (upper nasal cavities)

Front 10

General Senses

Back 10

Pressure, temperature, pain, touch from the skin and internal organs
Position from muscles, tendons, and joints

Front 11

Eye

Back 11

Protected by:
Skull Bones forming the orbital cavity
Upper and lower eyelids
Eyelashes and eyebrow
Conjunctiva
Lacrimal glands produce tears

Front 12

Coats of the Eyeball

Back 12

Sclera
Choroid
Retina

Front 13

Sclera

Back 13

Outermost tunic made of tough connective tissue
White of the eye

Front 14

Choroid

Back 14

Second tunic. Delicate connective tissue interlaced with blood vessels