Anatomy B/C

rsascioly
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Re: Anatomy B/C

Postby rsascioly » February 25th, 2014, 7:58 pm

Hey guys! I got first place in Anatomy at regionals, but the test was too easy. I don't know what to expect at the Southern California State competition. Last year, they made us label a bunch of diagrams. Do you know what they have had for years before?

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Re: Anatomy B/C

Postby mej710 » February 26th, 2014, 2:57 pm

Could you guys help explain how a impulse works, with the Na+ and K+ transfer? I don't get it :!: :!: :!:
Basically, when a neuron is at resting membrane potential, there is a higher concentration of Na+ ions outside the cell and a higher concentration of K+ ions inside the cell. However, there are fewer ions inside making it less positive or more negative. This means the cell is polarized when it is more negative inside. The action potential is the electrical current that travels through the neuron when it is stimulated. The minimum stimulus needed to achieve action potential is called the threshold stimulus. When a stimulus is received by the neuron, the Na+ gates open and because it is less negative on the inside of the cell and more positive on the outside, the Na+ ions come rushing into the cell. This is called depolarization because it makes the inside of the cell more positive than the outside. Then, the K+ gates open and K+ rushes out of the cell. This is called repolarization. At this point, the neuron is back to being more negative on the inside and more positive on the outside. However, Na+ is concentrated inside the cell and K+ is concentrated outside, which is the opposite of where they were concentrated when the cell was at resting membrane potential. So the Na+/K+ pump, with the help of ATP, pumps 3 Na+ ions out of the cell for every 2 K+ pumped in until the ion concentration on the inside and outside are back to normal.

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hmath729
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Re: Anatomy B/C

Postby hmath729 » February 27th, 2014, 5:12 pm

That helps a lot. Thanks!!! 8-)
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hmath729
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Re: Anatomy B/C

Postby hmath729 » March 1st, 2014, 2:14 am

NO NERVOUS SYSTEM NEXT YEAR!!!!! :evil: :(
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hmath729
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Re: Anatomy B/C

Postby hmath729 » March 1st, 2014, 2:16 am

What do you guys think will be the new system next year????
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mej710
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Re: Anatomy B/C

Postby mej710 » March 1st, 2014, 4:39 am

So we will definitely have integumentary system but no nervous system?

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darkdeserthighway
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Re: Anatomy B/C

Postby darkdeserthighway » March 1st, 2014, 5:37 am

NO NERVOUS SYSTEM NEXT YEAR!!!!! :evil: :(
There will be no nervous system? are you sure?
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Crazy Puny Man
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Re: Anatomy B/C

Postby Crazy Puny Man » March 1st, 2014, 8:15 am

I hope you're wrong :(

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Re: Anatomy B/C

Postby vennowsah » March 1st, 2014, 12:18 pm

From what I've heard, the systems for Anatomy rotate every two years. Nervous system has been here for last year (2013) and this year (2014), so I doubt it will serve again next year.
I hope I'm wrong though. Nervous system is the best.
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hmath729
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Re: Anatomy B/C

Postby hmath729 » March 2nd, 2014, 5:03 am

Sucks, doesn't it? :evil: :cry:
Which system is next? I think respiratory.
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