Response

Stimulus and Response

• Definitions:

  • Stimulus: Any factor in the environment that triggers a response from an organism.

  • Response: The reaction from the organism towards a stimulus.

Nervous System

• Function: The nervous system is responsible for processing stimuli and initiating responses.

• Information Processing:

  • Senses collect information from the environment.

  • The information is transported to the brain for analysis (e.g., determining danger, love, hate).

  • The brain gives orders to the body's cells and organs.

Neurons

• Definition: Neurons are nerve cells that make up the nervous system.

• Parts of Neurons:

  • Dendrites: Receive signals from other cells.

  • Cell Body: Contains the nucleus and organelles.

  • Axon: Long projection that transmits impulses away from the cell body.

  • Schwann Cells: Produce the myelin sheath.

  • Myelin Sheath: Insulating layer that speeds up nerve impulse transmission.

  • Nodes of Ranvier: Gaps in the myelin sheath where impulses jump, enhancing speed.

  • Axon Terminal: End of the axon that transmits the signal to the next neuron.

Summary of Process

• Process of Response:

  • Step 1: Senses detect stimuli.

  • Step 2: Information travels to the brain.

  • Step 3: Brain analyzes the information.

  • Step 4: Orders are sent through neurons to create a response.