5.2 The senses

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

Chapter 5 Sense it

- Take off your coats and hats

- Take out your laptop and join the lesson-up

- Code is on the board to the right

This lesson

6 min	Revision previous learning goal
2 min	Learning goals for 5.2 + 5.3
37 min	New info + excercises
5 min	Review learning goals

Annette picks up her pen.
She feels her pen because impulses are produced in her tactile senses

1. How does your body notice changes around or inside you?

1. true
2. false

Put in the correct order

1. How does your body notice changes around or inside you?

1.

2.

3.

4.

An impulse is conducted to the brain

a low temperature reaches the snesory cells

The girl feels that the water is cold.

Cold senses convert stimuli into impulses

1. How does your body notice changes around or inside you?

Senses or response

Stimuli

look for food

ear

throwing up

tongue

catch a ball

listening music

smell parfum

see fire works

Feeling thirsty

5.2 the senses 

Learning goals:

1. What are your main sense organs?

2. What are your five main senses?

Sense organ

Organs which detect  a stimuli.

1. What are your main sense organs?

5 Main senses

Ability given by sense organs, such as vision, hearing, smell, taste and feeling.

2. What are your five main senses?

Which sense are you using
when you are petting a puppy?

2. What are your five main senses?

What is the difference between
a sense and a sense organ?

1. What are your main sense organs?

2. What are your five main senses?

5.3 Vision

Learning goals:

3. What are the parts of your eye?

4. What do the parts of your eye do to help you see?

5. How can vision problems be corrected?

The eye

3. What are the parts of your eye?

The eye

Cornea

A transparent layer in 

the front of your eye 

that covers the iris and the pupil.

Pupil

Opening of the iris

Sclera

The white, outer covering of the eye.

4. What do the parts of your eye do to help you see?

The iris and lens

Iris

Opens or closes to allow for more/less light to pass into the eye

Lens

Can change its shape to accommodate for distance.

Controlled by Ciliary muscle.

Relaxed muscle --> Long thin lens --> far away

Contracted muscle --> Short fat lens --> close by

4. What do the parts of your eye do to help you see?

Question: It is a sunny day and you are wearing sunglasses. Your friend does not have sunglasses. When you look into your friend’s eyes, you see very small pupils. Explain why your friend’s pupils are very small in sunny weather conditions.

4. What do the parts of your eye do to help you see?

Rods and cones

Retina

A thin layer of light-sensitive cells in the back of your eye.

Cones 

Light-sensitive cells in the retina that allow you to see

 colours in bright light.

Rods

Light-sensitive cells in the retina that allow you 

to see grey or black-and-white images in dim light.

4. What do the parts of your eye do to help you see?

Rods and cones

Fovea

The most sensitive part of the retina,

 right across from the lens, which contains many cones.

Optic nerve 

The nerve of the eye that transmits nerve impulses 

to the brain.

Blind spot

The spot where the optic nerve enters the eye; it does not contain light-sensitive cells.

4. What do the parts of your eye do to help you see?

When light enters the eye, it passes through various regions until it reaches the optic nerve. Which of the following gives the correct order for light passing through the eye? 

lens

retina

cornea

pupil

Lens

Iris

Cornea

Eye muscle

Choroid

Retina

Fovea

Blind spot

Optic nerve

Sclera

Vitreous body

What do we use to see colours

1. Rods
2. Cones
3. Lens
4. Fovea

• Sit in front of the screen.
  
• Close your left eye.
  
• Stare at the cross with your right eye.
  
• Very slowly move your face towards the screen and keep staring at the cross.
  
• At some point you will notice that the black dot disappears!

Next slide is about learning goal 5

 

How can vision problems be corrected?

1. What are your main sense organs?

I don't understand it and need more explanation😟

I don't understand it, but i'll try reading my textbook first 🤓

I understand it, but I can't explain it 🙂

I understand it and I can explain it to someone else 😎

2. What are your five main senses?

I don't understand it and need more explanation😟

I don't understand it, but i'll try reading my textbook first 🤓

I understand it, but I can't explain it 🙂

I understand it and I can explain it to someone else 😎

3. What are the parts of your eye?

I don't understand it and need more explanation😟

I don't understand it, but i'll try reading my textbook first 🤓

I understand it, but I can't explain it 🙂

I understand it and I can explain it to someone else 😎

4. What do the parts of your eye do to help you see?

I don't understand it and need more explanation😟

I don't understand it, but i'll try reading my textbook first 🤓

I understand it, but I can't explain it 🙂

I understand it and I can explain it to someone else 😎

5. How can vision problems be corrected?

I don't understand it and need more explanation😟

I don't understand it, but i'll try reading my textbook first 🤓

I understand it, but I can't explain it 🙂

I understand it and I can explain it to someone else 😎