Biology SL
Biology SL
4
Chapters
553
Notes
Theme A - Unity & Diversity
Theme A - Unity & Diversity
Theme B - Form & Function
Theme B - Form & Function
Theme C - Interaction &  Interdependence
Theme C - Interaction & Interdependence
Theme D - Continuity & Change
Theme D - Continuity & Change
IB Resources
Theme C - Interaction &  Interdependence
Biology SL
Biology SL

Theme C - Interaction & Interdependence

Uncover Sensory Neuron Secrets Unlock Body's Response!

Word Count Emoji
590 words
Reading Time Emoji
3 mins read
Updated at Emoji
Last edited on 14th Jun 2024

Table of content

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.

How do Signals travel?

  • Signals from receptors are sent to the CNS by sensory neurons in the form of nerve impulses.

  • These travel through axons. Fun fact: an axon might be over a meter long if the receptor is at your toe's end!

  • Brain gets signals from main organs in the head (e.g., eyes & ears).

  • Spinal cord receives signals from other parts of the body (e.g., skin & muscles).

  • Specific parts of the brain handle different signals. E.g., the visual cortex processes what we see.

    Think of it like this: It's as if your body is a big city, and the neurons are the highways, ensuring that messages (cars) get to the right destination.

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IB Resources
Theme C - Interaction &  Interdependence
Biology SL
Biology SL

Theme C - Interaction & Interdependence

Uncover Sensory Neuron Secrets Unlock Body's Response!

Word Count Emoji
590 words
Reading Time Emoji
3 mins read
Updated at Emoji
Last edited on 14th Jun 2024

Table of content

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.

How do Signals travel?

  • Signals from receptors are sent to the CNS by sensory neurons in the form of nerve impulses.

  • These travel through axons. Fun fact: an axon might be over a meter long if the receptor is at your toe's end!

  • Brain gets signals from main organs in the head (e.g., eyes & ears).

  • Spinal cord receives signals from other parts of the body (e.g., skin & muscles).

  • Specific parts of the brain handle different signals. E.g., the visual cortex processes what we see.

    Think of it like this: It's as if your body is a big city, and the neurons are the highways, ensuring that messages (cars) get to the right destination.

Unlock the Full Content! File Is Locked Emoji

Dive deeper and gain exclusive access to premium files of Biology SL. Subscribe now and get closer to that 45 🌟