Senses

Question 1

What are the 5 sense organs?

Answer 1

Eyes, nose, ears, tongue and skin

Question 2

What receptor do eyes have?

What are the stimuli?

Answer 2

Light receptors(rods-light and cones-colour)

Light and colour

Question 3

What receptor do ears have?

And their stimuli?

Answer 3

Sound and balance receptors

Sound and balance

Question 4

What receptors do noses have?

And their stimuli?

Answer 4

Taste and smell receptors

Chemical

Question 5

What receptors do skin have?

And their stimuli?

Answer 5

Pressure, heat and touch.

Pressure and heat.

Question 6

What receptors do tongues have?

And their stimuli?

Answer 6

Taste receptors

Bitter, salt, sweet and sour.

Question 7

What is the yellow spot?

Answer 7

It is a concentration of rods and cones and is where the light ideally focuses. This is the most sensitive part of the eye.

Question 8

What is the pupil?

Answer 8

It is a hole in the eye, controlled by the iris (a muscle)which contracts and relaxes, letting light in and out. It adjusts itself to the light so there aren’t excessive amounts of light in the eye.

Question 9

What is the blind spot?

Answer 9

This is where blood vessels and nerves join the eyeball. It has no light sensitive cells.

Question 10

What is the retina?

Answer 10

It is a layer of light sensitive cells.

Question 11

What is the vitreous humour?

Answer 11

It is a jelly which fills the back of the eye.

Question 12

What is the sclerotic layer?

Answer 12

It is a tough white protective layer of the eye.

Question 13

What is the lens?

Answer 13

The lens helps focus the light onto the back of the eye, thus creating a picture.

Question 14

What are the suspensory ligaments?

Answer 14

They hold the lens in place.

Question 15

What is the cornea?

Answer 15

It’s a clear window in the sclerotic in front of the iris. It lets light into the eye.

Question 16

What is the aqueous humour?

Answer 16

A watery liquid in the front of the eye.

Question 17

What is the conjunctiva?

Answer 17

It’s a thin clear skin which covers the front of the eye.

Question 18

What are ciliary muscles?

Answer 18

They change the shape of the lens during focusing.

Question 19

What’s the optic nerve?

Answer 19

It’s the nerve from the eye to the brain.

Question 20

How does the tongue detect taste?

Answer 20

Our taste buds pick up the stimuli salt, bitter, sweet and sour.

Question 21

How does sound travel?

why cant sound travel through a vacuum?

Answer 21

Sound is a vibration of the air particles hitting each other and they travel in a wave into the ear.

Sound can’t travel through a vacuum because there aren’t any air particles for sound to actually happen.

Question 22

Name a musical instrument and state how it makes sound.

Answer 22

A violin: the bow vibrates the metal strings which vibrate air particles and make the particles start moving.

Question 23

Is it faster for sound to travel through solid, liquid or gas? Why?

Answer 23

Solid. The particles are close together so the vibrations move from one particle to another very quickly.

Question 24

What is the most sensitive part of the body? Why is this useful?

Answer 24

Hands. Many delicate tasks are done with hands so the more information the brain gets through nerves, the more fragile a job the hands can do.

Question 25

What is noise?

Answer 25

Unwanted sound

Question 26

What is an echo?

Answer 26

It's a reflection of sound off a surface.. The sound waves hit a surface and return to the ears of the sound maker.

Question 27

What is the pinea?

Answer 27

It's the outer ear.

Question 28

What's the outer ear canal?

Answer 28

The sound vibrations travel along the ear canal to the ear drum. It is a passage to the ear drum.

Question 29

What's the ear drum?

Answer 29

When sound reaches, the ear drum vibrates in and out. This makes the ossicles vibrate.

Question 30

What are the ossicles?

Answer 30

They are connected to another. When the ossicles vibrate they cause the oval window to vibrate in and out. The ossicles magnify sound.

Question 31

What's the oval window?

Answer 31

It is connected to the cochlea. When is vibrates in and out, it causes vibrations to move through to the cochlea.

Question 32

What is the cochlea?

Answer 32

The cochlea contains a carpet of tiny hairs which are connected to nerves. Vibrations in the cochlea cause these hairs to vibrate up and down sending messages to the brain.

Question 33

What is the auditory nerve?

Answer 33

This transmits impulses from the cochlea to the brain.

Question 34

What are the semi-circular canals?

Answer 34

These are not involved in hearing but help us balance and tell us which way we move our head by using fluid in the ear.

Question 35

Name two ways of going deaf from loud noises.

Answer 35

The tiny hairs in the cochlea die out / loud noises burst your ear drum!

Question 36

What is a human's general auditory range?

Answer 36

20Hz - 20000Hz

Question 37

What is the unit of frequency?

Answer 37

Hertz.

Question 38

What is the unit for measuring the loudness of sound?

Answer 38

Decibels.

Question 39

How do we see objects with our eyes?

Answer 39

Light reflects off the object into our eyes. Light is bent as it passes through the lens. An upside-down picture of the object is focused on a layer called the retina. The retina sends messages to the brain which allows us to see the image the right way up.

Question 40

What does wavelength tell us about sound?

Answer 40

If the distance between the two crests or troughs is large the sound is high pitched. Wavelength is pitch and the larger the width between a trough the higher the pitch. So the smaller the width the lower the pitch.

Question 41

What does frequency tell us about a sound?

Answer 41

The number of waves passing one point per second. This corresponds to the pitch of the sound. The more waves passing a point per second, the higher the frequency.

Question 42

What does amplitude tell us about sound?

Answer 42

The height of a sound wave or the depth of a trough. This corresponds to how loud the sound is. The higher the wave, the louder the sound.

Question 43

Give an example of a luminous object. Why do we call it luminous?

Answer 43

The sun. A luminous object is an object that produces light. A mirror is NOT luminous as it doesn't produce light, it just reflects light.

Question 44

What is the law of reflection?

Answer 44

Incident ray = reflection ray Whatever the angle of the incident ray, the reflection ray will always be the same.

Question 45

How do you measure the angles of reflection of incidence?

Answer 45

You draw a straight line of 'normality' done the middle of the mirror on the surface. You place your ray of light where you want and draw the angle. After wards you measure the angle on the paper using a protractor.

Question 46

What needs to be done to taste and smell chemical before they are detected?

Answer 46

They need to be dissolved in water to affect special sense cells.