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B1 > Nerevs And Hormones > Flashcards

Nerevs And Hormones Flashcards

1
Q

nervous system 3

A

what allows you to respond to changes in your environment and co-ordinate actions
made up of neurones

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2
Q

stimilus

A

changes in your environment u might need to respond to

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3
Q

receptors 3

A

detect stimuli and change the stimulus energy into electrical impulses
found in sense organs

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4
Q

eyes

A

sensitive to light

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5
Q

ears

A

contain receptors sensitive to sound and balance receptors sensitive to change in position

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6
Q

nose

A

smell receptors sensitive to chemical stimuli

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7
Q

skin 4

A

receptors sensitive to touch pressure pain and tempchange

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8
Q

CNS 4

A

where all the information from the receptors is sent
where reflexes and actions are coordinated
consists of brain and spinal cord
neurons transmit information as electrical impulses to the cns

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9
Q

effectors3

A

muscles or glands
instructions from the cns are sent along neurons to effectors
effectors respond to nervous impulses

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10
Q

sensory neurones

A

nerve cells that carry signals as electrical impulses from the receptors to the cns

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11
Q

relay neurons 2

A

nerve cells that carry signals from sensory neurons to motor neurons
found in cns

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12
Q

motor neurons

A

nerve cells that carry signals from the cns to the effectors

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13
Q

synapses

A

connection between two neurons
nerve signal is transferred by chemicals which diffuse across the gap
chemicals then set off a new electrical signal in the next neurone

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14
Q

reflexes

A

fast automatic response to stimuli

bypass your brain

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15
Q

homeostasis controls 4

A

temperature water content

ion content blood glucose content

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16
Q

controlling body temp

A

37°C bc that’s the temp enzymes work at best

brain is ur thermostat it’s sensitive to blood temperature in the brain

17
Q

controlling ion content 2

A

some ions lost as sweat

the kidneys get rid of ions from theblood for urine

18
Q

controlling water3

A

skin as sweat
lungs as breath
kidneys as urine

19
Q

controlling blood glucose 2

A

normal metabolism of cells removes glucose from the blood

exercise removes glucose

20
Q

hormones 3

A

chemical messengers which travel in the blood to activate target cells
produced and secreted by glands
carried in the blood plasma

21
Q

menstrual cycle

A

build up of protective lining in the womb for f.egg
release of egg from ovaries
breakdown of uterus lining if no f.egg

22
Q

FSH4

A

follicle stimulating hormone
pituitary gland
causes egg to mature in one of the ovaries
stimulates the ovaries to produce oestrogen

23
Q

oestrogen

A

produced in the ovaries
causes pituitary gland to produce LH
inhibits further release of FSH

24
Q

LH

A

luteinising hormone
pituitary gland
stimulates release of an egg

25
Q

oestrogen reducing fertility

A

prevent egg release

consistabtly high levels of oestrogen prevents FSH therefore the maturation of an egg and so no egg is released

26
Q

progesterone reducing fertiility

A

stimulates the production of thick cervical mucus preventing the sperm getting to the egg

27
Q

problems with fertility drugs 3

A

they don’t always work
expensive to repeat the process
to many eggs stimlated meaning multiple pregnancies

28
Q

IVF 5

A
  1. FSH LH given to stimulate egg maturation
  2. eggs collected from ovaries
  3. eggs fertilised in lab
  4. f.eggs grow into embryos
  5. one or two embryos transferr3d back to uterus
29
Q

IVF problems 3

A

strong reaction to hormones. vomiting
increased cancer risk
multiple births high risk of stillbirth/miscarriage

30
Q

plants needs

A

light to make food

water to survive

31
Q

auxin

A

plants hormone that controls growth near tips of shoots amd roots
moves backwards to stimulate the cell elongation process

32
Q

phototropism

A

plant growth in response to light

33
Q

gravitropism

A

plant growth in response to gravity

34
Q

shoots grow towards light

A

when a shoot tip is exposed to light more auxin accumulates on the shades side making the shades side grow faster causing the plant to grow towards the light

35
Q

shoots grow away from gravity

A

gravity produces an uneven distribution of auxin audio in the tip with more on the lower side making the plant grow up

36
Q

roots towards gravity

A

more auxin will accumulate on its lower side when a root grows sideways
extra auxin on the lower side inhibits it’s its growth causing cell elongation on the upper side making the root bend downwards

37
Q

roots towards moisture

A

more auxin on the side with more moisture inhibiting growth on that side causing root to bend in that direction

38
Q

use of plant hormones 2

A

1.selective weedkillers
made of hormones that only affect the broad leave plants
2.rooting powders
plant cuttings will grow roots rapidly in soil

B1 (8 decks)

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