term test's next week!!!!
hahhhaha.
haven't been blogging for a week i think.
came here to destress. (:
today was HAP day.. still have chapter 4 left!
think i shall do it tmr.
I'm turning into a memorizing machine!
oh god.
(skip this if you want. This will make no sense to you. LOL. :P )
lets see:
Nerve Stimuluswhen an action potential reaches the presynaptic terminal, the neurotransmitter, ACh, is released from the vesicles, & into the synapse.The action potential then diffuses into the synaptic cleft and binds itself to the Na+ channel receptors in the sarcolemma, and this cause the receptor to open.This causes the sarcolemma to be permeable to the Na+ ions.The Na+ ions diffuse into the muscle cell, and initiates the action potential in the muscle cell.The action potential then moves towards the muscle fibre, which leads to muscle contraction.Sliding Filament Theory-When the action potential is produced in the presynaptic terminal, it triggers the sarcoplasmic recticulum to release calcium ions.-the calcium ions then bind the troponin to the actin filament. This binding causes the tropomyosin molecules to move away from the myosin binding sites.-the myosin heads then break down ATP to release energy, and this energy is stored in the myosin heads.- the myosin heads then attaches itself to the actin filament, & this causes cross bridges.- the cross bridges move closer towards the centre of the sarcomere, and cause the actin filaments to slide across the myosin actin filaments.- when the myosin heads moved as far as it can, it will release the actin filament to go back to its original position. The myosin heads then binds to other actin filaments, and this causes a cycle.Muscle relaxation- Ca+ ions are transported back to the sarcoplasmic recticulum.- the tropomyosin molecules then moves back to its original position, blocking the myosin attachment binding sites.- this means that the myosin heads is unable to attach itself onto the actin filaments, which leads to muscle relaxtion.Energy for Muscle contraction- ATP is the main source of energy of muscle contraction, and it is produced by aerobic respiration.- however, muscle fibres cannot store ATP.- the excess ATP is then used to produce CP, another high energy molecule that can be stored in the muscle fibres.- during moderate exercise, existing ATP is broken down, before CP is broken down to release more ATP.- During excessive exercise, anaerobic respiration takes place, and lactic acid and ATP is produced.OMG. thats it.
it took me an hour to memorise the blue chunks above. HAHA!
so had drums on monday. ROCKED. (:
i love drums! (:
took back all our papers within this week.
failed MSt.
AS EXPECTED. ):
BEATRICE SHI FU, you must teach me leh!
hahahahha i don't want to retake MSt next year!
saw Charmaine from salvo while waiting for Kaixin to finish lecture.
& that kaixin was super funny.
she told me to wait for her outside business sch, then she came out.
& called me just a few steps in front of me, to ask me where was I.
LOL!!
Marc, me & charmaine was laughing like crazy, omg.
had lunch at Bizpark - the hor fun's nice! (:
not bad!
talk talk talk, realised that i was late for MSt lecture. heh heh!
lalalala, then end of school.
then home-d. :D
(thanks!)chiong-ed HAP today.damn crazy, hahahaha.
alright, shall go sleeeeeep now. Church's tmr. :D
BYE! (:
