Zusammenfassung der Ressource
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