🌟 Overview: Reflex actions are quick, automatic body responses to stimuli. Imagine accidentally touching a hot stove - you'll pull your hand back quickly without even thinking about it! Let's delve deep into how this all works.

• 🚫🤔 Involuntary: You don’t need to think about them; they just happen!
• 💡 Example: You step on a Lego (ouch!) and immediately lift your foot.

• 🧠 Some reflexes are coordinated by the brain.
  • Example: Pupils in your eyes shrink in bright light, protecting your eyes.
• 🦴 Some are coordinated by the spinal cord.
  • Example: Pain reflex when stepping on something sharp.

A. Receptors 🎯

• Detect changes called stimuli.
• Some nerve endings can sense directly.
  • Example: Feeling pain or heat through nerve endings in the skin.

B. Sensory Neurons 🚀

• Collect messages from receptors.
• Send them to the central nervous system (CNS).
• Think of them as messengers sprinting from the scene to the control room.

C. Interneurons 🔄

• Located inside the CNS.
• Process signals, decide responses.
• Like the decision-makers, choosing what to do next based on the info they get.
• Fun Fact: For some reflex actions, there's only one interneuron doing this job!

D. Motor Neurons 🌉

• Receive signals from interneurons.
• If they get a strong enough signal, they send an impulse to an effector.
  • Think of them as the bridge between decisions and actions.

E. Effectors 🎬

• Muscles or glands that act in response.
• Muscles: They contract.
  • Example: Lifting foot when stepping on something sharp.
• Glands: They secrete stuff.
  • Example: Drooling at the sight or smell of your favorite food.