Y2_T3_LSN_3.4+3.5

• Science
• Middelbare school
• havo, vwo
• Leerjaar 2

Get ready

• Your Macbook (join the LessonUp)
• Your notebook.
• Your textbook.
• Pen & highlighter

Topic 3

ORGANIZING THE WORLD

Plan for today

• Explanation T3.4 The nervous system
  
• 5 minute break
• Explanation T3.5 The spinal cord
• Make homework 

3.4 The Nervous system

Learning goals

I can....

• explain the function of the nervous system
• describe the components of the central nervous system 
• explain the process wherein the nervous system detects information from the environment and reacts to it
• describe the functions of the three different types of

neurons 

Key words

• Nervous system
• Brain
• Spinal cord
• Central Nervous system
• Peripheral nervous system
• Stimulus
• Receptor cells
• Impulse 

• Coordinator
• Effector 
• Response 
• Neurons
• Sensory neurons
• Interneurons
• Motor neurones 

Your nervous system

Your nervous system is your bodies fast communication system:

• Your CNS - Central nervous system (control system)
• Your PNS - Peripheral nervous system (routers)

Signals

When your body observes stimuli from it's environment, the following cycle happens:

• PNS - Your body receives a stimuli (senses)
• CNS - Your brain/spinal cord coordinates a response.
• PNS - Muscles / glands create a response

Neurones - Wires

Our body has 3 types of neurones:

• sensory neurones - connects senses to the CNS
• interneurones - the neurones within the CNS
• motor neurones - connects the CNS to the effectors

5 minute break

3.5 The Spinal Cord

Learning goals

I can....

• explain how reflexes are different than a normal nervous system response.
• follow the chain of events that take place during a reflex arc.
• explain how impulses are passed from one neuron to the next.
• explain the function of neurotransmitters in spreading impulses.
• describe how drugs can connect to receptors and disturb impulses.

Key words

• Reflexes 
• Spinal cord
• Synapses
• Vesicles
• Neurotransmitters

Reflexes

A reflex is also a response of your body, but then using your spinal cord as a coordinator instead of a your brain:

• this is often used in cases of emergency

Synapses

Synapses are connections in your nervous system that use chemicals in stead of electricity:

• synapses work with a chemical called neurotransmitters
• the bag that holds the neurotransmitter is called a vessicle

Homework

• Study the glossary of 3.4 & 3.5
  
• Complete the exercises of 3.4 (p. 136-141)
• Complete the exercises of 3.5 (p.144-151)

Next week = review lesson

Week after = presentations