Chapter 3: Observing | repetition 3.1-3.3

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

Chapter 3: Observing

repetition 3.1-3.3

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.

Check knowledge 3.2

Do you already know all the parts of the eye?

eyelid

tearduct

tear gland

eyebrow

eyelash

Eyebrow

Eyelashes

Tear fluid

Eyelid

sweat and other moisture runs past your eyes and not in them

protects against dirt and excessively bright light

protects against dehydration and cleans the eye

can close as a protective layer over your eye 

Lens

Iris

Cornea

Eye muscle

Choroid

Retina

Fovea

Blind spot

Optic nerve

Sclera

Vitreous body

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. 

Tones in hertz

• Humans can hear between ± 20 en 20 000 Hz .

- Lowest limit of hearing (onderste gehoorgrens) = lowest tone someone can hear

- Highest limit of hearing (bovenste gehoorgrens )= highest tone someone can hear

-Hearing range  (gehoorbereik) = Range between highest and lowest limit

Elderly people: hairs on the sensory cells in the cochlea break. The highest limit drops to 15000 Hz

Sound level (Geluidsniveau)

In decibel (dB)

130 dB and higher: chance of becoming deaf

How do you call the outside of your ear?

1. Earshell
2. Auricle
3. Retina
4. Auditory canal

Which part of your ear can be damaged by ear buds or other sharp objects?

1. Auditory canal
2. Tympanic cavity
3. Auricle
4. Eardrum

Why does an African elephant have such big ears?

1. To better capture sounds
2. To cool down
3. To communicate
4. All of the above

Tekst

auditory/ear canal

auricle

eardrum

ossicles

cochlea

Questions?