3.2 Seeing

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 1

Chapter 3: Observing

3.2 Seeing

Schedule today

Welcome

Learning objectives

Check knowledge 3.1

Instruction

Homework

End of class

Learning objectives

You will learn 

- how your eyes are constructed

- how you are able to see colours

- how you control the amount of light in your eyes

- how your eyes are able to focus 

- how you see depth.

Translate:
Prikkel

1. Sense
2. Stimuli
3. Impulse
4. Neuron

Translate:
Sense

1. Reageren
2. Ruiken
3. Zintuig
4. Prikkel

Wat is a sensory organ?

1. A change in the environment
2. Electrical signals that travel through the nerves to the brain
3. An organ that can sense stimuli and convert them into impulses
4. The processing of impulses from the environment

What is a stimulus?

1. Something you feel when you touch a sharp object.
2. Information from your surroundings.
3. A signal that's being transported through the body.
4. A part of the central nervous system.

A stimulus can be picked up by a sensory organ. Then it is being converted into an impulse. What is an impulse?

1. A chemical reaction of the body.
2. An electrical signal.
3. The same as a stimulus.

What are senses of heat?

1. Senses that are hot.
2. Senses that get hot when you use them.
3. Senses that percieve heat.
4. Senses that only operate during the summer.

The outside of the eyes

Rods and cones

Rods (Staafjes): Black, white, grey

- work during nighttime

Cones (Kegeltjes): colours

- work during daytime

- Three types: Red, green, blue  

Homework 3.2 part 1

3,4,7,8,10,13,14,15

Welcome! Are you ready?

- Phone in your locker

- Coats are on the coat rack or in your locker

- Bags are off the table

- Take off your hat or hoodie

- Books and laptops are on the table

- Did you do your homework?

Homework for today was:

3.2 part 1

3,4,7,8,10,13,14,15

Schedule:

1. Welcome (5 min)

2. Day opening (5 min)

3. Check your homework (10 min)

     Finished? Make 3.2 ass. 17-18,       20, 23, 24, 28

4. Log in (LessonUp) for a quiz            (5 min)

5. Instruction 3.2 (part B) (10 min)

6. Homework 3.2 (10 min)

7. End of class (5 min)

Which cones are activated when you see the colour yellow?

1. Green and blue
2. Red and blue
3. Red and green
4. Yellow

What is the name of the part of the eye that controls the size of the pupil?

1. Sclera
2. Cornea
3. Retina
4. Iris

What part of the retina is best at seeing colours?

1. Sclera
2. Macula
3. Choroid
4. Blind spot

Most people produce tears when crying.
Where are these tears produced?

1. Tear duct
2. Tear gland
3. Tear duct and tear gland

Which type of neuron do you see in the picture?

1. Sensory nerve
2. Moving nerve
3. Motor nerve
4. Impulse nerve

Write down the stimuli you can perceive with the senses in your skin.

It is your birthday, but to your surprise your present has not been wrapped. You are blindfolded and need to guess what is in front of you. Carefully, you start feeling the object and as a result of the tension you also feel the beating of your heart. The present has a soft skin, a warm body, and….this can only be a puppy!! You have never felt so good about a present before.

Pupillary reflex (pupilreflex)

= enlarging the pupils in dim light and making the pupils smaller in bright light.

Accomodating (accomoderen)

Accomodating = Making the eye lens more convex (bol) or flat (plat).

Ciliary muscle (straallichaam)=  A muscle surrounding the eye lens.

Lens is attached to suspensory ligaments (lensbandjes).

Glasses

accomodating or eyeball length 

Far sighted (Verziend): Short eyeball, only clear vision of distant objects.

Short-sighted (Bijziend): Long eyeball, only clear vision of nearby objects. 

What?	3.2 ass. 17,18, 20, 23, 24, 28
How?	In your workbook. Use the information from your textbook.
Help?	You may gently consult with your neighbor. Raise your hand if the two of you can't figure it out.
Time?	10 minutes
Finished?	write a summary of 3.2.
Product	You have practiced 3.2!