nerves and senses

Question 1

define eumetazoa

Answer 1

complex multicellular organisms with tissue and nervous system

Question 2

what is the flow of stimulus through the nervous system?

Answer 2

receptor–> relay neurone–> CNS–> motor neurone–> effector

Question 3

in order of transmission, what is the structure of a relay neurone

Answer 3

dendrite–> axon (myelinated)–> axon terminal

Question 4

which axon can transmit impulses faster, squid or vertebrates?

Answer 4

squid (25m/s) v vertebrate (50m/s)

Question 5

true or false: the more folds in the brain of an organism, the more intelligent it is

Answer 5

TRUE

Question 6

what is the forebrain for?

Answer 6

thinking and processing senses

Question 7

what is the cerebellum for?

Answer 7

movement and coordination

Question 8

what is the brainstem for?

Answer 8

basic behaviours such as unconscious breathing and other autonomous actions

Question 9

do sponges have central brains?

Answer 9

NO

Question 10

do flatworms have brains?

Answer 10

YES very small ones and two ventral nerve chords running the length of their bodies

Question 11

do molluscs have brains?

Answer 11

YES very small ones and two ventral nerve chords running the length of their bodies

Question 12

do arthropods have brains?

Answer 12

YES they are very simple and are for processing sensory info directly from eyes and other receptors

Question 13

do crustaceans have brains?- refer to ganglions

Answer 13

YES very small ones. they have one ganglion per body segment joined by paired nerve chords