Main Concepts 🔍
- The nervous system perceives stimuli from the environment.
- There are various receptors, both external and internal.
- Signals travel via sensory neurons to the central nervous system (CNS).
✨ Fun Fact: Think of your nervous system like the ultimate Wi-Fi network. It receives data from all over, processes it, and tells the body how to respond. It's like getting a Snapchat notification and then deciding whether to open it or not!
Sensory reception & neurons
Sensory Receptors: Detect changes in the environment.
- Located in the skin and sense organs.
- Examples
- Nerve endings that sense touch and heat.
- Light-sensitive rod and cone cells in our eyes that help us see!
Imagine this: It's like your skin and eyes acting as antennas, picking up signals (stimuli) from around you.
Internal receptors
Monitor conditions inside the body.
- Stretch Receptors in Muscles: Detect muscle contractions. This lets your brain figure out if you're slouching or standing tall.
- Stretch Receptors in Arteries: They're like the body's barometers, measuring blood pressure.
- Chemoreceptors in Blood Vessels: Act like tiny scientists, analyzing if we have high or low levels of oxygen, carbon dioxide, and glucose.
Real World Example: It's like the sensors in a car. They let you know if the engine's too hot or if you need to refuel.