Taste, Smell and more….

After quiz have journals ready

Students will be able to… Demonstrate their understanding of the

senses

What is your favorite food to eat? Why? Explain with detail.

How do you know where sound is coming from? Difference in time it takes to reach each ear

What’s the difference? Key Terms

Low pitch v. medium to high pitch Nerve impulse rate to brain v. vibration on the

basilar membrane

Where is it located? Above the cochlea – inner ear

What do the semicircular canals do? Filled with fluid that moves in response to

movement of head Hair Cells respond to the movement

What is its function? Maintaining balance

What is it? Sensory mismatch between info form vestibular

system (head movement and eye sees no movement)

What are the symptoms? Nausea, dizziness

What is Meniere’s disease Malfunction of canals – viral infection of the inner ear Symptoms – spinning and buzzing sounds

What is Vertigo? Malfunction of canals Dizziness and nausea

Question of the day – Type 111/1/10

Taste test…. Explain everything that happens when

you are tasting the candy in your journal. Include all of your senses at work and

anything that comes to mind…including memories.

Taste Tongue

5 basic tastes – Sweet, salty, sour, bitter, umami Surface of Tongue

Chemicals breakdown stimuli into molecules Mix with saliva and run into trenches on surface Stimulate taste buds

Taste buds Look like onions Produce nerve impulses that reach parietal lobe Brain transforms into sensations of taste Replaced every 10 days

Flavor Combo of taste and smell

Stimulus Smell volatile substance (molecules in air)

Olfactory cells Receptors in 1 inch square patch of tissue in

uppermost part of nasal passages Covered in mucus which dissolves molecules

and stimulates cells Cells trigger nerve impulses that travel to

brain which interprets the smell

Sensation memories We can identify as many as 10,000 different

odors Adaptation goes into effect

Functions To intensify the taste of food Warn of dangerous foods Elicit strong memories/feelings

Pressure, temperature and pain Half-dozen miniature sensors that are

receptors Change the pressure into nerve impulses

and send to brain

Skin Outer layer Thin film of dead cells, no receptors Different shapes and functions

Hair Middle layer Free nerve endings wrap around base of each hair follicle Follicles fire with a burst of activity when first bent Sensory adaptation

Free nerve endings Near bottom of skin Nothing protecting them

Pacinian corpuscle In fatty layer Largest touch sensor Highly sensitive to touch Responds to vibrations and adapts quickly

What causes pain? unpleasant sensory and emotional experience

from tissue damage, thoughts, beliefs, or environmental stressors

results from many different stimuli

How does the mind stop pain?

Gate control theory of pain Nonpainful nerve impulses compete with pain

impulses in trying to reach the brain Creates a bottleneck or neutral gate Shifting attention or rubbing an injured area

decreases the passage of painful impulses Result: pain is dulled

Chemicals produced by the brain and secreted in response to injury or severe physical or psychological stress

similar to those of morphine Brain produces in situations that evoke great

fear, anxiety, stress, or bodily injury as well as intense aerobic activity

Connected to pain centers in brain

Acupuncture Thin needles inserted in various points on

body’s surface – twirl needle 10 – 20 mins reduction in pain for some

Homework

Identify and memorize the definitions of perception and sensation

On your worksheet label each image with an P if it is more of a Perception or an S if it is more of a Sensation.

If it is more of a perception explain what the illusion is and what is producing it.

Essay – will count as 25 points towards your combined quizzes, worth 75pts, to make a test grade out of 100.

No Reading for homework…stepping away from book next week!

SEE YOU MONDAY!