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5.1: Planning

Difficulty Level: At Grade Created by: CK-12

Key Ideas

• A reflex is the simplest circuit in the nervous system.
• Once triggered by a stimulus, a reflex goes to completion and causes a response, such as a muscle reaction. Some reflexes are easier to control than others.
• The five parts of a reflex arc are the sensor, sensory neuron, control center, motor neuron, and muscle.

Overview

In the previous sections students learned about components of the nervous system. In this section they investigate a nerve circuit. They learn that reflexes are simple circuits in the nervous system that result in a response. Students identify reflexes, which are an important part of behavior and serve as protection from harm.

Objectives

Students:

\begin{align*}\checkmark\end{align*} demonstrate and explain the five-part sequence of a reflex arc.

\begin{align*}\checkmark\end{align*} distinguish between a motor neuron and a sensory neuron.

\begin{align*}\checkmark\end{align*} explain the role of an inhibitory interneuron in a reflex.

reflex, stimulus

Student Materials

Activity 4-1: How Fast Is Your Reaction Time?

• Activity Report
• 20 cm\begin{align*}20 \ cm\end{align*} metric ruler

Teacher Materials

Activity 4-1: How Fast Is Your Reaction Time?

• Activity Report Answer Key

See Activity 4-1 in the Student Edition

Activity 4-1: How Fast Is Your Reaction Time

• Gather 20 cm\begin{align*}20 \ cm\end{align*} rulers.

Interdisciplinary Connections

Math Use strings of holiday minilights set to sequence mode to illustrate the nerve impulse traveling down the axon.

6 , 7 , 8

Date Created:

Feb 23, 2012

Apr 29, 2014
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