nervous system

Question 1

what is homoesitis

Answer 1

its the balance of the internal conditions of an orgnaism to keep the optimal conditions for it to function

Question 2

what do inernal conditiions include

Answer 2

body temp
ph
glucose concentration in blood
water content in body

Question 3

what are automic control systems

Answer 3

thinsg that react to changes in the body, externally like heat and sunbut also internally like blood sugar and water loss, this includes the nervous system and chemical responses

Question 4

what are receptors

Answer 4

cells that detect the changes/ sttimuli

Question 5

what is stimuli

Answer 5

the changes internally or externally

Question 6

what are coordination centers

Answer 6

areas that hear about changes from the receotors and send out singals alerting the system, this includes the brain which sends out singals

Question 7

what are effectors

Answer 7

the muscle/ gland that responds to the stimuli by restorin the conditions

Question 8

how does the nervous system work

Answer 8

so once the receptors have picked up on the stimuli they send electrical signals that pass along cells called neurons to the coordination cneters which send the responses back down through motor neurons to the receptors

Question 9

what are sensroy and motor neurons

Answer 9

motor neurones carry info from the coordination centers to the effectors whilst neurons, ususally in giant bundles of nerves, just carry it to the CC

Question 10

WHAT ARE SENSPRY NEurones

Answer 10

carry imulses from sense organs to the CC- like the nose sends imulses to make the salivary gland produce moer when it smells food

Question 11

independant variables of reaction prpactical

Answer 11

you could change hands, drink something in between, change background noise etc

Question 12

explain required practical reaction time

Answer 12

so one person sits on a stool and stretches their hand across the table with their hand over it, person two places a ruler in their hand so the thumb is at 0 and drops it randomly. the faster the person can snap their hand shut the faster the reaction time

Question 13

what are reflexes

Answer 13

automic responses, like breathing, that dont resquire the concious part of the brain

Question 14

what neurpnes to reflexes involve

Answer 14

sensory
motor
relay

Question 15

what are relay neurones

Answer 15

found in the CC it links the other two

Question 16

what are synaposes

Answer 16

junctions between neurones that they have to diffuse across by a diffused chemical

Question 17

how does the reflex arc work if you touch something hot

Answer 17

when we come across a stimuli so a sudden burn an electrical impulse goes along the sensory neurone to the CNS
AWHEN WE ARRIVE AT THE SYNAPSE between the sensory and relay neurone a chemical is released that diffuses from the relay to the motor, then at that synapse another chemical is released travelling to the effector
an impulse also goes from the CNS to the brain to let us know its happened

Question 18

where are central communication centers

Answer 18

brain
spinal chord
pancreas