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  

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?	Finish 3.1! --> This is homework! Afterwards:3.2 ass. 1, 3, 4, 8, 10, 12, 13, 16-18, 20, 23, 24, 28
How?	In your workbook (or computer). Use the information from your textbook.
Help?	You may gently consult with your neighbor or listen to music. Raise your hand if the two of you can't figure it out.
Time?	15 minutes
Finished?	Study the PIF or write a summary of 3.2.
Product	You have practiced 3.2!