Multicellular Organisms - Control and Communication

Question 1

cerebrum

Answer 1

conrols memory, personality, reasoning and concious response

Question 2

cerebellum

Answer 2

controls co-ordination and balance

Question 3

medulla

Answer 3

controls heart rate and breathing rate

Question 4

neuron

the three types

Answer 4

• sensory
• inter
• motor

Question 5

neuron

definition

Answer 5

neurons are specialised cells of the nervous system that conduct electrical impulses through the body, to and from the CNS (central nervous system)

Question 6

reflex arc

Answer 6

• sense organs detect stimuli through receptor cells
• sensory neurons pass it along to the CNS
• CNS interprets message and a response is passed from the interneuron to the motor neuron to the effector
• the effecter then carries out the response

Question 7

reflex action

Answer 7

A rapid, automatic, involuntary response to a stimulus to prevent injury

the message is not referred to the brain as it would take too long

Question 8

synapse

definition

Answer 8

the space between the end and beginning of neurons

Question 9

synapse

how it works

Answer 9

when a nerve impulse reches the end of a neuron, the ending releases a chemical which diffuses across the space between the neurons and triggers an impulse in the next neuron

Question 10

blood glucose regulation

too much sugar

Answer 10

• pancreas detects increase in sugar
• pancreas releases insulin into the blood stream
• insulin in the liver triggers glucose to be stored as glycogen
• sugar levels decrease

Question 11

blood glucose regulation

too little sugar

Answer 11

• pancreas detects decease in sugar
• pancreas releases glucagon into the blood stream
• glucagon in the liver triggers glycogen to be released as glucose
• sugar levels increase