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Science · Grade 7

Organism Systems and Information Processing

Learners trace how information travels from sensory receptors along neurons to the brain or spinal cord and out to muscles, and compare fast automatic reflexes with slower voluntary responses that can change through memory and practice. They analyse reaction-time data from a ruler-drop investigation, explain homeostasis as negative feedback using body temperature, and use exercise data to argue that the respiratory, circulatory, muscular and nervous systems work together.

  • 5 lessons
  • About 115 minutes
  • Organism systems and information check: 11 questions
  • Ways to answer: fill in the blanks, choose an answer, highlight a text, label a picture, match pairs and type a number
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What learners will discover

  • Describe the pathway from stimulus to response: receptors detect a stimulus, sensory neurons carry signals to the brain or spinal cord, which process them, and motor neurons carry signals to effectors such as muscles.
  • Compare reflexes with voluntary responses, explain how sensory information can lead to immediate action or be stored as memory, and analyse reaction-time data as evidence.
  • Explain homeostasis as keeping internal conditions within a narrow range by negative feedback, using body temperature as the main example.
  • Use evidence to argue that the body is a system of interacting subsystems, especially how the respiratory, circulatory, muscular and nervous systems work together during exercise.

Lessons

  1. From stimulus to response 9 steps5 practiceabout 22 min
  2. Reflexes, decisions and memory 7 steps4 practiceabout 20 min
  3. Investigating reaction time 9 steps5 practiceabout 24 min
  4. Homeostasis and negative feedback 9 steps5 practiceabout 22 min
  5. Body systems working together 8 steps5 practiceabout 22 min
  6. Organism systems and information check 11 questions at the end

Keep exploring

Games to practice with

  • Bridge LabBuild a bridge from beams, brace it with triangles, and stay on budget.
  • Circuit Workshop 3DWire up batteries, bulbs and switches on a 3D workbench.
  • River MysterySomething changed the river. Sample sites with a limited budget, follow the evidence and find where the change begins.

More 7th grade science

Guide for grown-ups