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The Senses 35-4. BIO 1004 Flora. Senses. Sensory receptors – react to a specific stimulus such as light or sound by sending impulses to the CNS Sense organs – Eyes Ears Nose Mouth skin. 5 Categories of Sensory Receptors. Pain – located throughout body – except brain

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The Senses 35-4

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The senses 35 4

The Senses 35-4

BIO 1004

Flora


Senses

Senses

  • Sensory receptors – react to a specific stimulus such as light or sound by sending impulses to the CNS

  • Sense organs –

    • Eyes

    • Ears

    • Nose

    • Mouth

    • skin


5 categories of sensory receptors

5 Categories of Sensory Receptors

  • Pain – located throughout body – except brain

    • Respond to chemicals released by damaged cells

  • Thermo – located in skin, body, and hypothalamus

    • Detect variations in temperature

  • Mechano – skin, skeletal muscle, ears

    • Detect sensation of touch, pressure, and sound


5 categories of sensory receptors1

5 Categories of Sensory Receptors

  • Chemo – Nose/Taste buds – senses to chemicals in the environment

  • Photo – eyes – sensitive to light


Vision process

Vision Process

  • Light enters through cornea

    • Cornea – focuses light

  • Light passes through aqueous humor

    • Aqueous humor – fluid chamber

  • Iris – colored disk structure at back of aqueous humor

  • Pupil – small opening in iris

    • Muscles adjust the size of the pupil regulating the amount of light that enters the eye


Vision process cont

Vision Process Cont.

  • Lens – behind the iris, helps the eye focus on or near distant objects

  • Vitreous humor – large chamber of the eye that is filled with fluid

  • Retina – light is focused here

    • Photo receptors are located here

  • Optic nerve - carries impulses assembled in the eye to the brain


2 types of photoreceptors

2 Types of Photoreceptors

  • Rods – Sensitive to light, not color

  • Cones – not sensitive to light

    • Responsible for our color vision


Hearing and balance

Hearing and Balance

  • 2 Functions of ear

    • Hearing

    • Balance


Hearing process

Hearing Process

  • Vibrations enter through auditory Canal

  • Vibrations cause tympanum (ear drum) to vibrate

  • Vibrations are picked up by hammer, anvil, and stirrup

  • Stirrup transmits vibrations to oval window

  • Vibrations cause pressure waves in fluid-filled cochlea

    • Cochlea is lined with hairs that move as a result of the waves, thus sending nerve impulses to the brain through cochlear nerves


Balance

Balance

  • Semicircular Canals – monitor position of the body in relation to gravity

  • Process:

    • Fluid in canals changes with position of head

    • Fluid moving causes hairs to bend and send impulses to brain that determine body position


Smell taste and touch

Smell, Taste, and Touch

  • Chemoreceptors in nasal passages respond to chemicals and communicate with the brain

  • Taste of food is actually smell (hold nose when you eat)

  • Taste buds – sense organ

  • Skin – largest sense organ

    • Contains the most sensory receptors that respond to temp, pain, and touch

      • Face, fingers, and toes have the most


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