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Sensing the Environment: Integumentary System and Reflexes

Explore the integumentary system and reflexes, including the pupil, retina, farsightedness, iris, and sensory receptors for taste, smell, touch, and hearing.

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Sensing the Environment: Integumentary System and Reflexes

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  1. Chapter 17-2: Sensing the Environment Integumentary System: the organ system that forms a protective covering on the outside of the body. Reflex: an involuntary and almost immediate movement in response to a stimulus.

  2. Feedback Mechanism: a cycle of events in which information from one step controls or affects a previous step. • Pupil: the opening that is located in the center of the iris of the eye and that controls the amount of light that enters the eye.

  3. Retina: the light-sensitive inner layer of the eye, which it receives images formed by the lens and transmits them thru the optic nerve to the brain. Farsightednessresult if the lens of the eye focuses light just b/h the retina.

  4. Iris: the colored, circular part of the eye. Sequences for structures that light passes thru when entering the eye, from outside to inside:Cornea, Pupil, & Lens In order for you to see:eye must receive light that is reflected, scattered, or emitted by an object.

  5. Papillae: bumps on the tongue containing taste buds. Olfactory cells: cells in the nose that sense odors. Skin receptors: light touch, pressure and heat, and deep pressure and vibration.

  6. Cochlea: a coiled tube that is found in the inner ear and that is essential to hearing. Sequence of structures involved in hearing a sound: eardrum, ear bones, cochlea

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