COM S1

Question 1

Identify the role of receptors in detecting stimuli

Answer 1

Cells of the nervous system not all same  some have role of detecting changes in the environment

Question 2

Name the receptors…

Answer 2

skin, taste, smell, photo receptors, mechanoreceptors, thermoreceptors, chemoreceptors

Question 3

Skins role as a receptor?

Answer 3

pressure, pain, heat & cold receptors

Question 4

Taste role as a receptor?

Answer 4

salty, sour, sweet, bitter, umami

Question 5

Smell role as a receptor?

Answer 5

Approx. 1000 different receptors that detect over 10000 different odours

Question 6

Photoreceptors role as a receptor?

Answer 6

eye > detect light

Question 7

Mechanoreceptors role as a receptor?

Answer 7

ear . vibrate in response to sound waves, skin . detect pressure and touch

Question 8

Thermoreceptors role as a receptor?

Answer 8

skin > detect warmth and cold

Question 9

Chemoreceptors role as a receptor?

Answer 9

nose and tongue > detect odours and tastes

Question 10

What does the response to a stimulus involve?

Answer 10

Essential for survival > we need to pick up information from environment > interpret it
> React appropriately
STIMULUS > RECEPTOR > MESSENGER > EFFECTOR > RESPONSE

Question 11

Whats the stimulus?

Answer 11

provoked by change in internal or external environment

Question 12

Whats the receptor?

Answer 12

detects stimulus

Each sensor receptor > responsible for particular stimulus

Question 13

Whats the messenger?

Answer 13

receptors that change energy of stimulus > into energy used to start nerve impulse > Nerve impulse = messenger

Question 14

What’s the effector?

Answer 14

Organ that receives message > carries out response

Question 15

Whats a response?

Answer 15

whats carried out

Question 16

identify the range of senses involved in communication.

Answer 16

visual (sight), olfactory (smell), Auditory (hearing), Tactile (touch), taste, other senses.

Question 17

Give a description of Sight.

Answer 17

• Communication by colour
• Pattern of plumage
• Posture
• Body movement
• Facial expression  used to signal breeding times, threat, defend territory

Question 18

Give a description of Smell

Answer 18

• Communication by chemical signals
• Scent marking of boundaries and territories
• To search for and identify food and water
• Species and sex recognition
• Detect and avoid harmful substances

Question 19

Give a description of Hearing

Answer 19

• Communication by sound
• Used to defend territory
• Alert others of danger
• Used in breeding
• Bird song helps females find males of same species

Question 20

Give a description of Touch

Answer 20

• Avoiding obstacles
• Fighting
• Defence mechanisms
• Friendship behaviour and copulation
• Animals use to attract others

Question 21

Give a description of Taste

Answer 21

• Bees and blowflies have taste receptors on feet that help locate food

Question 22

Give a description of Other senses.

Answer 22

• Senses to detect electric fields
• Magnetic fields
• Polarised light
• Gravity