coordination and response

Question 1

homeostasis

thermoregulation

hypothalamus

Answer 1

maintenance of constant internal environment and body water content and body temp

regulating body temp

inside brain maintains temp of blood if varies from 37 too much causes changes

Question 2

synapse

Question 3

central nervous system
peripheral nervous system

Answer 3

-includes brain and spinal cord, processing centre of body
outside brain and spinal cord. relay info between brain and rest of body

Question 4

nervous v hormonal

Answer 4

electrical impulses. chemical

travels along axon. in blood

speed of response. fast due to shorter distance, small number of synapse, small number of neurone. slow

length of response. short lived. long

effect. localised. wide spread

Question 5

motor neuron, relay, sensory shapes and part

Answer 5

dendrite-many branches connect with neurones. where . communications received and sent

-cell body maintains neurone structure

-axon where electrical impulses from the nerve travel away to be received by other neurones. long too connect with many parts of body

-myelin sheath enables electrical impulse to travel faster through axon

axon terminal-where neurotransmitters released

Question 6

stimuli

response

reflex

Answer 6

a thing or event that evokes specific functional reaction. change in condition

response any behaviour as a result of an external or internal stimulus

simplest typeof a response. processed by spinal cord which means response is very in voluanty and fast protecting form harm

Question 7

iris in dim light

Answer 7

circular muscles contrast and radial muscles relax making pupils dilate so mores light enters eye

Question 8

rod and cone cells

Answer 8

respond to differences in light intensity not wavelength. most sensitive and used in low light intensities.

respond to diff wavelength thus respond to diff colours. work in bright light so we only see coloured images when light is bright enough. mostly clustered on fovea where light falls

Question 9

disant object

Answer 9

-light rays are almost parallel when they enter which means they need less refraction to come to a focus on light on the retina

-cornea starts to bend rays and the lens is less involved

-ciliary muscles relax and lens is pulled thinner. less curved by susperonsary ligament which pull them tight.

Question 10

negative feedback system

Answer 10

conditions in body change from set point. change detected. corrective mechanisms activated. corrective mechanisms switched off.

Question 11

to keep cool and hot

Answer 11

sweat as evaporation whcih requires heat so removes het
vasodilation hairs lay flat

shiver
release energy from food
hairs stand
vascoonstriction

Question 12

vasoconstriction and dilation

Answer 12

when too cold nerve impulses from hypothalamus cause arteriole to constrict which causes blood flow I skin capillaries bearsyrface o skin Tod ecrease s =o little heat can be lost to environment by radiaton and convection

Question 13

gland

Answer 13

organ that makes one or more substances such as hormones, digestive juices, sweats, tears

Question 14

insulin

Answer 14

converts glucose to glycogen which is stored in liver.
glucagon opposite. glucose soluble so osmotic efect

Question 15

auxins in stem

Answer 15

clinostat

auxins made in shoot/root tip ;
(auxin) spread / move / diffuse ;
idea of unequal distribution of auxin ;
auxins collect, in lower side of stem
auxin stimulates (cell) elongation (where it accumulates)

Question 16

rod cells

Answer 16

detect light
respond to diff in light intensity and most sensitive at low light intensities so used then cannot disintguish diff colours