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Biology 1
Descripción
Biology Unit 1
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FaultyHammer
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Resumen del Recurso
Biology 1
Adaptation of animals
Synapses and Reflexes
Synapses connect neurones
Chemicals diffuse across gap, carrying signal
Reflexes are automatic responses
EXAMPLE: Shock, body releases adrenaline.
REFLEX ARC
Stimulation of pain recepton
Impulses travel sensory neurone
Impulse passed along relay neurone
Impulse travels along motor neurone
Muscle contracts to react.
Hormones
Ovaries produce oestogen
Chemical messengers that travel in the blood to activate target cells
Pituitary Gland makes FSH and LH
FSH causes eggs to be produced
LH causes egg to be released from ovary
Oestrogen causes LH to be made
IVF treatment
Eggs taken in lab
Fertilised with donor sperm, making embryo
this then implanted back into mother
Plant Hormones PAGE 24
Auxin is growth hormone
Grows near tips of shoots and roots
IN SHOOTS, EXTRA AUXIN CAUSES GROWTH
IN ROOTS, EXTRA AUXIN INHIBITS GROWTH
TOWARDS LIGHT
More auxin in the shade, shoot bends
AWAY FROM GRAVITY
More Auxin on lower side, shoot grows up
Immune system
White Blood Cells
Produce Antitoxins
Produce antibodies
Invading cells have antigens
When foreign antigen found, antibodies made
These are protiens
Made RAPIDLY
Specific to ONE antigen
Consume pathogens
Pathogens
Bacteria
Small living cells, reproduce rapidly
Virus
NOT Cells, much smaller
Invade cells and multiply
Make us ill
Make Toxins
Damage Cells
Vaccination
Dead/Inactive cells
Allows body to recognise antigen more quickly next time
Stops us from getting infected
Pros and Cons
Pros
Control/wipe out diseases
Epidemics prevented
Cons
Don't always work
Allergic reactions, but rare
Preparing a petri dish
Sterilise before use to kill bacteria
Swab bacteria onto agar jelly
Seal with tape and allow to incubate
KEY
IMPORTANT
LIST OF THINGS
TOPIC
TOPIC
TOPIC
Recursos multimedia adjuntos
Reflex_Arc (image/jpg)
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