2.1

Question 1

What are receptor cells

Answer 1

Groups of cells found in your sense organs

Question 2

Examples of receptor cells that detect stimuli (5)

Answer 2

Light
Sound
Smell
Taste
Touch
Heat

Question 3

What causes a response?

Answer 3

• information detected by your body is sent along neurons (bundled together in nerves) to the brain
• brain processes the info received
• brain sends impulse to effectors (muscles/glands) causing a response

Question 4

What is a reflex action

Answer 4

Automatic and rapid responses to stimuli

Question 5

Reflect actions involve what 3 neurons?

Answer 5

Sensory
Relay
Motor

Question 6

Sensory

Answer 6

Receptor cells —> CNS (brain/spinal chord)

Question 7

Relay

Answer 7

Found in CNS

Sensory —> motor

Question 8

Motor

Answer 8

CNS —> effectors

Question 9

How longitudinal waves travel from vibrating objects so that we can hear sounds
(3)

Answer 9

• when a drum is struck,it vibrates causing air particles next to it to vibrate
• these vibrations pass energy into neighbouring particles
• this eventually causes your ear drum to vibrate so that we can hear sound

Question 10

What is the human hearing range?

Answer 10

20-20,000 Hz

Question 11

Significance or homeostasis

Answer 11

The body needs to maintain a constant, internal environment called a homeostasis

Question 12

What are hormones?

Answer 12

Chemical substances that control many processes within the body

Question 13

What are hormones secreted by?

Where are they transported to?

Answer 13

Glands

Transported to their target organs in the bloodstream

Question 14

What do high blood glucose levels indicate?

Answer 14

Symptom of diabetes

Question 15

How are type 2 diabetes controlled?

Answer 15

Lifestyle change

Diet/exercise

Question 16

How are type 1 diabetes controlled?

Answer 16

Insulin change 
(Insulin dependent diabetes)

Question 17

How levels are monitored/controlled by the pancreas:

Too high

Answer 17

Pancreas releases the hormone insulin into the blood causing the liver to remove Glucose from the blood and store it as insoluble glycogen

Question 18

How levels are monitored/controlled by the pancreas:

Too low-

Answer 18

Pancreas releases glucagon causing the liver to convert glycogen back to glucose and release it into the blood

Question 19

The body maintains a constant temperature using what?

Answer 19

Thermoregulatory centre in the brain

Question 20

Constant temp

Increase/decrease sweating

Answer 20

Cools the body down by evaporation

Question 21

Constant temp

Dilating blood vessels in skin capillaries

Answer 21

Increase blood flow to/heat loss from skin

Question 22

Constant temp

Constricting blood vessels supplying skin capillaries

Answer 22

Decrease blood flow/amounts of heat lost

Question 23

What happens through negative feedback?

Answer 23

Changes are reversed and returned back to normal

Question 24

implications of loud sounds

Answer 24

tittinus

constant ringing in ear

Question 25

what must a person do to stay healthy?

Answer 25

the body must keep itself at the right temperature

control sugar content in the bloodstream

Question 26

the healthy body detects external changes using what?

Answer 26

sense organs and the process this information in the brain

nervous system coordinates response causing body to make physiological changes

Question 27

what is involved in a relay

Answer 27

• receptor detects a stimulus
• sensory neurone sends signal to relay neurone
• motor–> effector
• effector produces response

Question 28

info- neurons to brain

Answer 28

Receptors respond to a stimulus and send impulses along sensory—>CNS
•CNS coordinates info and sends impulses along motor—> effectors
•which bring about a response.

Question 29

how does the body maintain constant temp, using centre in brain

Answer 29

• sweating
• constricting
• dilating