SENSES.

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Presentation transcript:

SENSES

What would happen next?

Nervous system Parts of our body we use to sense things are called SENSE ORGANS – eye, ear, mouth, skin, nose. Each SENSE ORGAN has special cells called RECEPTOR CELLS. Each receptor cell is sensitive to different things.

Senses Receptors in eye sensitive to light Receptors in ear and sensitive to sound Receptors on tongue and sensitive to chemicals Receptors in nose and sensitive to chemicals Receptors in the skin and sensitive to touch, pressure, pain, temperature

1.

Spinal cord cross section Main part of our nervous system is called the Central Nervous system Spinal cord cross section

Spinal Cord

Let me introduce you to my friends! Mrs. Sensory nerve Mr. Motor Nerve Nerve cell family are like messengers They carry electrical impulses to and from the sensory organ (eye) and the spinal cord.

Reflex in the finger Stimulus picked up by Receptor cells in finger (skin) Impulse passed on to sensory neurone Sensory neurone passes impulse to spinal cord Spinal cord sorts out response and send message to motor neurone Motor neurone tells the finger to pull away

Reflex in the leg Stimulus picked up by Receptor cells in leg (skin) Impulse passed on to sensory neurone Sensory neurone passes impulse to spinal cord Spinal cord sorts out response and send message to motor neurone Motor neurone tells the leg to move

Match up sense organ to stimuli

What have we leant today? Sense organs in the body are eye, tongue, ear, skin and nose Sense organs have receptor cells which respond to specific stimuli Nerve cells relay information (messengers) as electrical impulses Brain or CNS make the decisions!

Stimulus (change) picked up by receptor Impulse carried along nerve cell (Sensory neurone) to spinal cord Spinal cord or brain sorts out message Impulse carried along nerve cell (motor neurone) to effector organ Effector organ brings about a response

What did we do last lesson?? Reflex Arc What did we do last lesson?? Central Nervous System, electrical, organs, stimuli Sense ____ in the body are eye, tongue, ear, skin and nose Sense organs have receptor cells which respond to specific _______ Nerve cells relay information (messengers) as ____________ impulses CNS –________________make the decisions!

Why is good reflex important?

Learning objectives By the end of the lesson you will… Be able to test and measure your own reflexes Be able to record and display your results

How fast are your reflexes?? How can we measure our reflexes? Practical experiment….Using a ruler 1.Using a ruler you have to see how quickly you can catch it. 2. Each person will try three times and record their results in a table 3. We will then collect the class data and find out who has the fastest reflexes!!!

Results Name Result 1 Result 2 Result 3 Average NOTE : To work out the average you add all the result up, then divide by three…….EASY!!

Who is the fastest - Class results Name Average reflex (cm) A B C D E F G How else can we display our results? Graph Remember Title, label axis,

Learning objectives Know you can…. Test and measure your own reflexes And record and display your results WELL DONE

Name Result 1 Result 2 Result 3 Average Name Result 1 Result 2 Result 3 Average Name Result 1 Result 2 Result 3 Average Name Result 1 Result 2 Result 3 Average

Title Label Axis Title Label Axis