Life Cycle - Human Biology (2B)
Pre Lab 

  • Analyzing requirements for growth. 
  • Investigating growth in humans.
  • energy
  • fat
  • fuel
  • mineral 
  • nutrient
  • protein
  • vitamin
  • worksheet

Students list what a body needs to grow.



Physical growth is easily measured in terms of weight and height.  Individual growth is an individual matter, sudden weight gain may be as ominous as weight loss.  

In general, a baby weighs three times as much at the end of the first year as he did when he was born.  His birth weight is doubled at approximately five months of age.  Continuous weight gain during the first year is one index of good nutrition.  If a baby's weight after the first few months from birth remains stationary this is an indication of illness or improper feeding.  Weight continues to increase during the second year, but at a considerable slower "velocity."  Sometime around two or three years of age, a child may look comparatively thin and undernourished to a worried mother, although his growth rate is normal.  A great growth spurt comes with puberty, which begins at different ages in different children.  Rapidly growing adolescents customarily consume, and need more food than adults.

How tall will a child be?  There are some rough formulas for predicting height.  First take a child's height at two years of age and multiply by two.  Add slightly to this result if the child is a boy, subtract a little if the child is a girl. The answer, however cannot be taken too seriously since growth is not a fixed process but a variable condition.    

In order to grow our bodies must obtain fuel and energy to meet the needs of our body cells.  The substances that meet these needs are called nutrients.  Animals take in these nutrients by eating food.  Food supplies us with necessary nutrients such as carbohydrates, proteins, fats, vitamins, and minerals.  In order to keep our bodies in the best of health we must eat a balanced diet.  A balanced diet includes eating from the four food groups, milk group, meat group, vegetable and fruit group, and breads and cereals group.  Three to four groups per day insures a nutritionally balanced diet.  

  1. Give the student the worksheet and read off the words listed below.  Have the students write in the appropriate place whether they are needed for the body to grow or they are not needed.


  1. The answers for the lab sheet are that the body does not need coffee, paint, dirt, candy, nor aspirin. 

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