Electricity | Review Lesson
This 120-minute review lesson helps Grade 11 students connect electricity to biology by revisiting how electrical signals function in cells, nerves, muscles, and experimental equipment. Students will review key concepts, analyze data, and apply ideas to challenging scenarios using discussion, retrieval practice, and short problem-solving tasks.
| Term | Definition |
|---|---|
| ion | A charged atom or molecule, such as sodium (Na+) or potassium (K+). |
| membrane potential | The difference in electrical charge across a cell membrane. |
| resting potential | The membrane potential of a neuron when it is not firing an impulse. |
| action potential | A rapid change in membrane potential that travels along a neuron. |
| depolarization | A decrease in the difference in charge across the membrane, making the inside less negative. |
| repolarization | The return of the membrane potential toward resting conditions after depolarization. |
| synapse | The junction where one neuron communicates with another cell. |
| neurotransmitter | A chemical messenger released at a synapse to transmit a signal. |
| stimulus | A change in the environment that triggers a response in an organism. |
Display 5 quick review prompts on membranes, neurons, and ions. Circulate and note misconceptions.
Individually answer in notebooks, then compare answers with a partner.
Review membrane potential, ion movement, and the role of sodium and potassium pumps using a diagram. Emphasize cause-and-effect relationships.
Annotate a neuron diagram and add key labels and arrows showing ion movement.
Model the stages of an action potential and the sequence of synaptic transmission. Ask students to predict what happens if a step is blocked.
Complete a guided sequence chart and respond orally to teacher questions.
Present 2-3 challenging scenarios, such as how a toxin affects ion channels or how reaction time changes when signaling is altered. Prompt students to justify answers with evidence.
Work in pairs to analyze each scenario and write short scientific explanations.
Run a fast-paced question round or card sort that requires students to match terms, diagrams, and processes.
Collaborate in groups, explain answers, and challenge other groups respectfully.
Lead a summary discussion connecting electricity in biology to communication, coordination, and homeostasis.
Contribute one key idea and one question they still have.
Summarize the main takeaways and assign homework. Clarify expectations and due date.
Record homework and complete a brief self-check of confidence on the topic.
Revisit the lesson objectives and have students state one concept they understand better and one concept they still need to practice. End with a one-sentence summary: electrical signals allow cells to communicate quickly and coordinate body functions.
Complete a one-page review task: answer 6 mixed questions on membrane potential, action potentials, and synapses, plus one short response explaining how a change in ion movement can affect nerve signaling.