Life Cycle - Human Biology (3B)
Pre Lab 

  • Comparing the different sensory organs.  
  • Contrasting their functions.
  • senses
  • sensory system
  • worksheets
  • reference material
  • Internet

Students compare their sensory organs. 



Children have learned that they have 5 different senses consisting of sight, hearing, taste, touch, and smell.  However, developing an understanding of each of these senses requires a more in depth study of the matter and an understanding of the how the brain interprets these signals. 

The sense of touch is dependant on the skin and the thousands of receptors that bring the information to the brain. It illustrates that the skin is composed of a bottom layer called the dermis and an upper layer called the epidermis.  Under most of the skin there is a layer of fat.  Certain parts of the body are more sensitive than others. 

The eyes are our window into seeing the world.  The different parts of eye, including the lens, cornea, iris, retina, and optic nerve allow light to be translated in our brain as objects. 

The sense of tasting uses the tongue, which can detect salt, bitter, sugar,  and sour in different places.  It also looks at why certain flavors taste the way they do.  

The smelling is due to tiny receptors in our olfactory membrane in our nasal cavity that sends information to the brain. 

The ears can translate sound waves into a recognizable form for the brain. 

The brain grows from 13 ounces as a baby to almost 3 pounds as a 6-year old. Electricity helps spark measures to our brain for interpreting.  It explains that damage to your brain can cause other damage, because the brain is so important for relaying messages from one part of the body to another.

  1. Give students the worksheet. Students should research more information about each of the senses pictured on the worksheet (hearing, touching, seeing, tasting, and smelling).  
  2. They should try and determine how and where in the brain does the translation occur.  Each of the sensory organs have ways to detect its surrounding.  Students should find out where they are located and how they work. 
  3. You may want to have students do search on the Internet or go to a children’s encyclopedia.

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