Nerves and Hormones

I Turner
Mind Map by , created over 5 years ago

Part of B1

I Turner
Created by I Turner over 5 years ago
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Nerves and Hormones
1 The Nervous System
1.1 Sense Organs
1.1.1 Detect stimuli
1.1.2 Contain receptors Groups of cells sensitive to a stimulus Change stimulus energy in electrical impulses
1.1.3 Eyes Stimuli=light Sense=sight
1.1.4 Ears Sense=hearing Stimuli=sound
1.1.5 Nose Sense=smell Stimuli=Gas Chemical
1.1.6 Tounge Sense=Taste Stimuli=Chemical
1.1.7 Skin Sense=Touch Stimuli=Pressure, temperature
1.2 How it works
1.2.1 Sensory Neurone Carry electrical impulses from receptors to central nervous system
1.2.2 Relay Neurone Signals from sensory neurone to motor neurone
1.2.3 Motor Neurone Signals from CNS to effector muscles or glands
1.2.4 Effectors Muscles contract in response to nervous impulses Glands secrete hormones
1.2.5 CNS Made up of Brain and Spinal Chord
2 Synapses
2.1 Connection between two neurones
2.2 Nerve signal transferred by chemicals which diffuse across a gap
2.2.1 These chemicals set off new electrical signal in next neurone
3 Controlling Fertility
3.1 Contraceptive Pill
3.1.1 Prevents Pregnancy
3.1.2 Oestrogen stops body from producing FSH
3.1.3 Artificial hormone levels stop if you forget to use it
3.1.4 Pros Made families smaller-prevents hunger issues
3.1.5 Cons Destroys eggs
3.2 IVF
3.2.1 FSH Used As many eggs as possible mature
3.2.2 Sperm mixed with eggs, fertilised eggs planted in tiny ball of cells
3.2.3 Happens in fallopian tube
3.2.4 Pros Helps struggling families
3.2.5 Cons Expensive Many eggs are killed
3.2.6 Helps fertilisation happen
4 Plant Hormones
4.1 Auxins
4.1.1 Controls growth near tips of roots & shoots
4.1.2 Responds to light (phototropism) gravity (gravitropism) and moisture
4.1.3 Moves backwards to stimulate cell elongation
4.1.4 No tip, no auxin
4.1.5 Shoots grow towards light and away from gravity
4.1.6 Roots grow towards gravity and moisture
4.2 Uses
4.2.1 Selective Weedkillers Only gets rid of unwanted plants
4.2.2 Fruit Ripening Helps fruit stay riper for longer-long shelf life
4.2.3 Rooting Powder Stimulates Growth
4.2.4 Seedless Fruits
5 Homeostasis
5.1 Keeping internal conditions stable
5.2 Ion Content
5.2.1 Lost in sweat
5.2.2 Absorbed into blood
5.2.3 Excess should be removed Kidneys remove it Ends up in urine
5.3 Water Content
5.3.1 Lost in sweat
5.3.2 Lost in breath
5.3.3 Lost in Urine
5.4 Sugar Content
5.4.1 Food puts glucose into the blood Normal metabolism of cells removes it Exercise removes too much
5.4.2 Insulin helps you to maintain correct glucose levels
5.5 Temperature
5.5.1 Enzymes work best at 37oC Body tries to maintain this temp
5.5.2 Brain acts as a thermostat
6 Reflexes
6.1 Automatic responses to certain stimuli
6.2 Reduces chances of being injured
6.3 Stimulus
6.3.1 Receptor Sensory neurone Relay Neurone Motor Neurone Effector Response
7 The Menstrual Cycle
7.1 Day 1:Bleeding Starts
7.1.1 Day 4-: Lining builds up Day 14: Egg Released Day 14-28: Wall Maintained Day 28:Lining breaks down
7.2 Hormones Involved
7.2.1 FSH Produced by pituitary gland Causes egg to mature in ovary Stimulates ovaries to produce oestrogen
7.2.2 Oestrogen Produced in ovaries Causes pituitary to produce LH Inhibits further release of FSH
7.2.3 LH Produced by pituitary gland Stimulates release of egg around middle of cycle

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