Nervous System Responses

Name:

Date:

Mapping the Nervous System in Action

Learning intentions: I can identify key parts of the nervous system. I can map how a stimulus produces a response. I can compare voluntary actions with reflex arcs.

Part 1: Nervous System Vocabulary

Match each term in the left column with the correct meaning in the right column. Write the letter in the gap.

1. Receptor ______

2. Sensory neuron ______

3. Motor neuron ______

4. Effector ______

5. Central nervous system ______

A. A muscle or gland that carries out a response

B. The brain and spinal cord

C. A cell that detects a change in the environment

D. A neuron that carries messages towards the CNS

E. A neuron that carries messages to an effector

Part 2: Sequence the Pathway

6. Number these parts from 1 to 5 to show the usual pathway from a stimulus to a response.

_____ receptor _____ sensory neuron _____ CNS/interneuron _____ motor neuron _____ effector

Part 3: Responses in Action

7. What is the difference between a voluntary response and a reflex arc? Give one example of each.

8. Explain the roles of the brain, spinal cord and neurons in producing a response.

9. Draw and label a reflex arc. Include: receptor, sensory neuron, spinal cord/interneuron, motor neuron and effector.

10. You touch a hot object. Describe the pathway that helps you move your hand away quickly. Explain why this response is useful.

11. Exit ticket: Complete this sentence: A nervous system response begins when __________ and ends when __________.

Teacher Answer Key – Final Page

1–5. Vocabulary matching: 1–C, 2–D, 3–E, 4–A, 5–B.

6. Pathway sequence: receptor 1; sensory neuron 2; CNS/interneuron 3; motor neuron 4; effector 5.

7. Voluntary response and reflex arc: A voluntary response is consciously controlled, such as choosing to lift a book. A reflex arc is a rapid, automatic response that helps protect the body, such as pulling a hand away from a hot object.

8. Roles: Receptors detect stimuli. Neurons carry electrical messages. The spinal cord helps carry messages and can coordinate rapid reflexes. The brain processes information, makes decisions and coordinates many responses.

9. Reflex arc diagram: Award credit for the correct sequence and labels: receptor → sensory neuron → spinal cord/interneuron → motor neuron → effector. Arrows should show the direction of the message.

10. Hot object: Heat and pain receptors in the skin detect the stimulus. A sensory neuron carries the message to the spinal cord. An interneuron passes it to a motor neuron, which carries the message to arm muscles. The muscles contract and pull the hand away. The rapid response reduces tissue damage.

11. Exit ticket: Accept answers such as “a receptor detects a stimulus” and “an effector produces a response”.