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Bio Predications (20 Viewers)

nitroexcalibur

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Yo biological homies, is it a bad idea to try to do some revision tonight? Or should I only exclusively do practice questions? I’m getting some conflicting answers from some friends so i wanna be sure im playing it right
 

nitroexcalibur

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I’m pretty confident in majority of mod 5, mod 6, and like 3/4 of mod 7. Mod 8 I’m good with for eyes + ears (I think), but I need to touch on kidney reabsorption (technologies I’m sorted). Homeostasis I’m all sorted for except for the plant stuff, same for non infectious diseases.
 
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I’m pretty confident in majority of mod 5, mod 6, and like 3/4 of mod 7. Mod 8 I’m good with for eyes + ears (I think), but I need to touch on kidney reabsorption (technologies I’m sorted). Homeostasis I’m all sorted for except for the plant stuff, same for non infectious diseases.
i'd revise mod 7/8 since a lot of the big questions come from that and then maybe do some past paper questions on those mods to get it in ur head yk
 

lxrnahj

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Yo biological homies, is it a bad idea to try to do some revision tonight? Or should I only exclusively do practice questions? I’m getting some conflicting answers from some friends so i wanna be sure im playing it right
tbh do revision this isn tlike chem where it requires application if u know the content really well u can asnwer questions lol
 

lxrnahj

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can we collectively agree not to learn action potentials and polarisation ty
jokes here i feel bad: "

An action potential is an electrical impulse that allows neurons to transmit signals over long distances. The process begins with the depolarization of the neuron membrane. When a neuron receives a stimulus, voltage-gated sodium (Na⁺) channels open, allowing Na⁺ ions to rush into the cell. This influx of positive ions makes the inside of the cell more positive, causing the membrane potential to rise from its resting state of about -70 mV to around +30 mV.


After reaching this peak, the neuron undergoes repolarization. Voltage-gated potassium (K⁺) channels open, and K⁺ ions move out of the cell, restoring the membrane potential to a more negative value. This movement of K⁺ out of the cell reestablishes the negative internal charge.


Finally, the neuron briefly enters a state called the hyperpolarization phase, where the membrane potential becomes slightly more negative than the resting potential. The sodium-potassium pump then restores the resting potential by actively transporting Na⁺ out and K⁺ back into the cell, preparing the neuron for another action potential.

" just know this
 
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jokes here i feel bad: "

An action potential is an electrical impulse that allows neurons to transmit signals over long distances. The process begins with the depolarization of the neuron membrane. When a neuron receives a stimulus, voltage-gated sodium (Na⁺) channels open, allowing Na⁺ ions to rush into the cell. This influx of positive ions makes the inside of the cell more positive, causing the membrane potential to rise from its resting state of about -70 mV to around +30 mV.


After reaching this peak, the neuron undergoes repolarization. Voltage-gated potassium (K⁺) channels open, and K⁺ ions move out of the cell, restoring the membrane potential to a more negative value. This movement of K⁺ out of the cell reestablishes the negative internal charge.


Finally, the neuron briefly enters a state called the hyperpolarization phase, where the membrane potential becomes slightly more negative than the resting potential. The sodium-potassium pump then restores the resting potential by actively transporting Na⁺ out and K⁺ back into the cell, preparing the neuron for another action potential.

" just know this
I was going to say RUDE but tysm there's sooo much and i cbf to learn thisss 😭
 

lxrnahj

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I was going to say RUDE but tysm there's sooo much and i cbf to learn thisss 😭
its not a big part of the syllabus tbh just know that sodium goes in (depolaarisation) and potassium goes out thru the membrane (repolarisation). sodium amkes it psoitive, and potassium gets it back to being negtaively charged. but beacause of this the cell becomes hyperpolarised (too negative). so sodium-potassium pump does the opposite (sodium out, potassium in) to get it back to normal before the whole thing repeats. did this make it easier
 

aqwerty13402

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im rank 1, but it doesnt help whatsoever cos my school is trash.

actually so scared for tmrw i swear, i dont feel ready
 

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