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Archived threads in /sci/ - Science & Math - 9. page

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Help /sci/ I need some assistance with my physiology assignment I was sick when we covered most of the stuff on the heart and im stumped on how to answer this question.

Left sided heart failure, is a condition which affects patients following a heart attack. In these cases, the heart attack causes some of the myocardium in the left ventricle to die, and, as a result the left ventricle does not work as well as it did when it was healthy. Given your knowledge of the cardiac cycle and the role of the left ventricle. Explain what would happen to Cardiac Output and Blood Pressure as a result of left heart failure. Use the two equations below to help illustrate your answer;
CO = HR x SV and BP = CO x TPR
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>>9163592
>>9163592
CO will decrease as SV decreases due to the weakened myocardium. Less muscle means a lower volume of blood pumped per stroke.

The left ventricle is extremely important as it's the last chamber before blood leaves the heart and enters the systemic circuit. A single stroke from the LV must push a bolus or "wave" of blood through the arteries, capillary beds, veins all the way back to the right atrium. There's an interestingly related condition called Left Ventricular Hypertrophy in which the LV becomes "overgrown" or puts on much more muscle mass to compensate for hardened arteries and higher blood pressure (which would resist the bolus from entering the systemic circuit). So the myocardium grows to provide a better SV, in that case. Left Side Heart Failure would basically b e the inverse.

t. Anatomy professor
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>stamp collecting

why don't you medshits just learn pattern recognition techniques and let the memorization for computers?

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Wt du think about this article and the lgbt response to it...

Apparently you can train algorithms to recognise gay people based on facial features.

http://www.bbc.co.uk/news/technology-41188560
5 posts and 1 images submitted.
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>>9162924
Shitty popsci clickbait.
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>>9162924
Humans can often tell when someones gay

Why not computers?

I think body language is much more telling though
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my mum is Dutch and calls me bas for a nickname

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When a medication should be taken "with food" because food increases it's absorbtion, how long do you have after eating to reap this benefit?
Would a drink with absorbable nutrients work the same in lieu of food?

Drug in question specifically is Spironolactone.
4 posts and 2 images submitted.
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there's lots of reasons.

One is first pass metabolism, that can decrease drug absorption by increasing drug metabolism.

Another would be the opposite, the drug could be more potent because there is nothing to dilute it, and depending on the drug this can mean the drug doesn't last as long, or is much more potent

But mostly i think you are supposed to drink water and have eaten when you take meds because this is how the drugs are made to be taken.


just ask your doctor.
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>>9162737
TRAAAAAANNNNNNNNNNSSSSSS
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as long as there's fatty substance in your stomach i'd imagine. a couple hours maybe?

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Can humans quantum tunnel theoretical although impossiblely low does it explain why some people dispear from the face of the earth all of a sudden
4 posts and 1 images submitted.
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>>9162636
nah that's just cause they blocked u on facebook

can u rlly blame them?
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>>9162636
It's technically possible but the odds are so low that there's an equal chance Jesus Christ would quantum tunnel to Manhattan in the year 2018
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>>9162636
Every single particle that you are made up of would have to simultaneously quantum tunnel in the same direction.

What was his fucking problem?
Also, post degenerate scientists
3 posts and 1 images submitted.
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https://youtu.be/4OxppDxzSww?t=1h14m48s
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>>9162570
>Spent too long around degenerate diseases.
>Became a degenerate.

Irony.

EMPIRACLE PROOF THAT STANDARDS OF BEAUTY CHANCE OVER TIME.
3 posts and 1 images submitted.
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>>9162537
I'd say it's proof the 13 Persian "men" were closet fudge packers. "Closet" might be contested.
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>>9162537
>Not empirical
Make it a 14th, faggot

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How is the boiling point of carbon dioxide lower than its melting point? How does sublimation occur? I don't understand.
4 posts and 2 images submitted.
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>>9162460
The boiling point isn't lower than the melting point, neither of those exist at STP because liquid co2 doesn't exist at STP. However at higher pressures and temps it does
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Is it not true though that, if one were to decrease the temperature or increase the pressure of gaseous carbon dioxide, it would reach of solid state before a liquid state?
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>>9162746
Depending on your starting temperature and pressure, it could be a yes or a no. You just described the reverse of sublimation, which is entirely possible. Look up how to read a phase diagram then look at the one I posted earlier. For your purposes you can ignore the supercritical fluid phase

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https://www.youtube.com/watch?v=Jint5kjoy6I
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Is the manner in which electrons behave not also determined? We are incapable of predicting their motion but nonetheless they must follow some order.
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>>9162436
Why must they follow some order? Isn't it equally likely that there is randomness in the universe? Even assuming they follow some order, does it even matter since noone will ever know and predicting the future far enough ahead is still impossible
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>>9162815
You mean, by "random" to say that certain things may occur without a previous cause? I suppose there is a small chance.

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Is it possible to master all of high school math, high school chemistry,physics and biology all in 4 months? It's killing me and my hair is starting to fall out.
4 posts and 1 images submitted.
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Pick up a Barron's sat book, that will teach you a lot.
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>>9162380
It's how I realized I was a self learner.
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Not even kidding, Barron's will fuck you up good

Why are we eating so much bread then? Carbs are bad for teeth, they turn into sugar quick. So why does the governments focus on chocolate and shiiet instrad of bread and cereal?
3 posts and 1 images submitted.
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>>9162236
>if UNFOUNDED STATEMENT then RETARDED CONCLUSION
thank you for confirming that GIGO still holds you negro
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>>9162382

Dude... carbs are bad for teeth. Are you that retarded?

https://www.deltadentalins.com/oral_health/healthyfoods.html

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Hey guys, let's say you have a factory and have a starting budget. You can buy different machines which will produce a product you can sell to gain money. There's low tier machines with low profit and higher tier with higher profit, if a low-tier machine costs x and produces y a higher tier costing 2x will produce strictly more than 2y. You can buy new machines anytime. Is the best pattern always (if anytime) buying the lowest tier and keeping one until you can buy the highest tier? If not, how do you determine what should you do, assuming they'll never break and economy is just "object x= y money"?
>inb4 homework, I'd have given you more data to give me directly the answer
It's something more game-related, but it could also be seen as cryptocurrency-related (what gpu mining rig should I buy?). Just curious tho.
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>>9162011
Bumperino
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>>9162011
look into lagrange multiplier - can calculate with that
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>economics
>science

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What's the best tool to manage information? I use Mindmanager but I don't feel very happy with it.
5 posts and 1 images submitted.
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brain
onenote
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onenote is not visual enough, but thanks!
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I use pen and paper. Sometimes i draw a crude, fast mindmap if in the process of understanding a subject well enough. My final mindmap should be spaced as evenly as possible. (This means I chose the right abstractions about the topic). By the time I am done, 95% of the learning is already done. I might review the mindmap some times, but usually I never look at it again, and also never forget the core concepts again.

Does entropy and heat make long term human space travel effectively impossible? How do you cool off enough when there's nothing but vacuum around and you can't afford to jettison anything? This is assuming there is enough energy somehow for continuous life support.

The only answer I imagined was extruding a fuckhuge thin surface material that cycles water through it edge it towards the background radiation temperature, but I have no idea if that would even work. Sounds problematic anyway.
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>>9161959
convert to electricity and shoot it away with lasers?
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>>9161959
No. We call what you described radiators. Both the space station and the shuttle have them.
>>9161991
That is thermodynamically impossible

What's the point of human space travel? We hold ourselves so far back by trying to make traveling through space possible for humans. Humans just aren't made to fly a ship through space. It's like making an aircraft carrier to transport a Macintosh 1. Other stars are so far away that a single human could never hope to travel to them in a lifetime, and then if we do manage to colonize a planet far away, they would be an entirely different world because of the time communications would take. All this is so much easier to accomplish with robots and ai made specifically to mine the asteroid belt, or explore the distant planets of Alpha Centauri. Why go on with people?
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>>9161939

Because answers are outer.
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>>9161939
Because a human could do everything the rovers have done on Mars in a day.

Robots are fine for exploration but they are much slower than humans, simply because of the transmission latency. You could always try better AIs to work alone and just send data back and get overall instructions, but there's always other trade offs, like if an instrument jams there's nothing you can do from Earth, but a human might be able to diagnose and fix it.

And I don't think anyone is really planning any human trips to Alpha Centauri, just so you know.
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>>9161939
What's the point of human space travel?
Because what the fuck else is there to do? stay on Earth until we wipe ourselves out? May as well make some token attempt to get off the planet.

Someone could explain how banking information during payment works especially during card-payment?

I mean all goes through a simple network/telephone cable , is there any encryption? any protocol ?Any safety features to. protect our data?

How this system could works in 2017 in this a really basic and simple way.

Any idea? any explanation to this?
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If you have a leak in a hose you can see where it is
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>>9161803
>encryption
RSA or its variant
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RSA ok thanks I will search it and figure it out how it works :D

by the way you can see a leak only if you where to look ;)

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