study or sleep? @study-or-sleep - Tumblr Blog

What if oxygen is poisonous and it just takes 75-100 years to kill us?

My science teacher said he thinks that’s true actually

Yeah this is actually pretty much exactly what is going on. It’s why anti-oxidants are such a big deal. Bonus fact: oxygen oxidizes stuff in your cells or, in other words, it’s not toxic, just setting you on fire very very slowly.

sarah-mcelroy-deactivated202601

femonologue

What if there are aliens out there but they subsist on entirely different substances and they’re just scared as shit of us and our crazy ass hell planet? Once in a while some alien anthropologist type suggests checking out the people on this inhabited planet out towards the galaxy’s edge. The other aliens just look at the naive academic with horror. No!! We do not go to that world. That is where the DEATH BREATHERS live. They recreationally consume poisons and are more or less composed of biological fire. Their atmosphere is made of rocket fuel. We must leave the DEATH BREATHERS in peace. Do not go there. Do not.

optimysticals

I tend to always reblog posts about humans being terrifying weirdos to aliens.

alessariel

@brainsforbabyjesus

brainsforbabyjesus

okay but…that is actually what went down on earth about 2.5 billion years ago.

Earth was doing just fine with a mostly nitrogen/carbon dioxide atmosphere and everyone was happy to go on living in anaerobic bliss and then cyanobacteria suddenly hit the scene, altered the atmosphere composition so that there was a ton of oxygen gas and killed practically everything (97% or more of all species on earth).

We are literally descendants of the DEATH BREATHERS and cyanobacteria is our deadly mother.

digitaldiscipline

The cyanobacteria holocaust is so big, it doesn’t even have a cool name; it’s just called “The Great Oxygenation Event”; the *second* most apocalyptic extinction event in our planet’s history is the one that’s called THE GREAT DYING (the Permian-Triassic event, about 252 million years ago).

This shit makes like the rock-throwing that wiped out the dinosaurs look like kindergarten.

violent-darts

OH HOW I LOVE THIS POST. It makes me so much happier about being alive. I AM BURNING VERY SLOWLY. *hugs it*

adv3nturelust

This is it: this is your sign. You’re brand new, refreshed, empowered to change. Your calmer, softer times are coming. Your confidence, your happiness, your bliss, is arriving. Self acceptance is easier, and taking care of yourself is no longer a chore, but something you look forward to. You start to feel replenished - you’re *you* again - and the next chapter of your happier life begins now.

biomedicool

Pregnancy - physiology

Hormones

hCG - human chorionic gonadotropin - present in blood and urine, produced by blastocyst and placenta

Low levels of hCG could mean miscarriage, ectopic pregnancy, miscalculation of dates

High levels = molar pregnancy (cells that normally form a baby dysfunction and form cysts instead), multiple pregnancy (twins etc), miscalculation of dates

Progesterone increases fat deposition in early weeks and stimulates appetite

Increased oestrogen from corpus luteum promotes mammary gland development (breasts enlarge)

And inhibits ovulation via negative feedback [OES decreases GnRH release by hypothalamus –> linhibition of FHS and LH –> no ovulation]

Relaxin (secreted by corpus luteum) softens connective tissue in preparation for labour - not specific, all joints can be affected

Peaks in early and late pregnancy

Physical changes

Blood pressure

As early as 4 weeks into pregnancy

plasma volume increase

caused by the affects of oestrogen and progesterone on the kidneys

OES and Prg cause vasodilation

less resistance = less pressure

Heart rate increases by 25% to compensate

stroke volume increases

increased overall cardiac output by 50% in third trimester

Direct action of enlarged uterus:

compresses the descending aorta and inferior vena cava

decreased venous return - less blood in means less blood out, less blood in ventricle –> reduced pressure on walls –> reduced force to exit –> reduced placental perfusion

increased aortic pressure

increased heart rate

[shouldn’t sleep on back for this reason]

Outcomes:

Fall in blood pressure (can cause collapse if serious)

Can cause foetal hypoxia even without mother symptoms

Haematological changes

red cell mass increase by 20% (renal - increased erythropoietin production in response to detection of blood oxygenation and sodium/water balance)

Plasma volume increases more than RBC count does, causing the impression of decreased haemoglobin (anaemia)

Increased tendency to clot (hypercoagulable)

due to increase in clotting factors and plasma fibrinogen

platelet production increase (however count drops due to increase in activity and consumption) - function remains normal]

WBC count may increase due to an increase in granulocytes

Respiratory changes

Increased chest diameter, diaphragmatic expression and elevation

dyspnoea common (difficulty breathing)

breathing becomes more costal (mouth) than abdominal

mainly mediated by progesterone levels (cause bronchial and smooth muscle relaxation and hypersensitivity to CO2)

Changes to the urinary system

cardiac output increase –> increase in renal plasma flow and glomerular filtration

increase in urea, creatinine, urate and biocarbonate clearance

with progesterone, renin and aldosterone up water retention increases

can lead to urinary stasis and increased risk of UTI

Any drugs given that are excreted renally must be given in much higher quantities consequently

Gastrointestinal changes

Appetite increase + cravings

Gastric reflux sphincter relaxation (increased indigestion, also due to increased intra-gastric pressure (expanding uterus))

gallbladder dilated

GI motility decreased and transit time slower

albumin and protein decrease

cholesterol twice normal value

Muskuloskeletal

Calcium reuptake into bloodstream results in mild decalcification of bones

relaxin softens joints (pubic symphysis + alters gait (waddling))

abdominal muscles stretch to elastic limit

stretch marks (stria gravidarum) caused by rupture of elastic fibres and small blood vessels

Reproductive changes

Massive increase in mass

Placenta growth (nutrition, excretion, immunity, endocrine)

Parental blood supply

elleroseblogs

Sometimes self care is studying for that test. Sometimes it’s cleaning your room. Sometimes it’s having that conversation you’re afraid of having, confront that person you’re afraid to confront. Sometimes it’s not just wrapping yourself up in a blanket and relaxing. Sometimes instead, it’s taking action against the problem.

mrsklemzak

Unpopular opinion, but yeah.

marystudies

tag yourself studyblr edition

im cactus

the-notegarden

remembering the kanji // 27.07.17

shibuyaku

Graffiti is prohibited

Got it.

aliciah

Saturday, February 27th, 2016. Physics notes I made yesterday during class (on the right page). Today I have so much work to do and this hot wheather is not helping at all.

cravingfreedom

Don’t think too much. Just do it. Live, travel and explore. Find yourself and see as much as you can, while you can.

CH (via cravinfreedom)

colormecosmic

snippets of my bullet journal ♪( ´▽｀)

nakedly

studymotivationuniversity

Let’s get started 📚👓

https://www.instagram.com/lauriedel/

take-up-and-read

23.10.2016 // Trying to finish my latin homework ft. my cat who won’t leave me alone 🐱🐱

theycallmecynic-deactivated2018

24.11.2016 days of productivity: 1/100

decided to start the 100 days of productivity challenge even though my A’s are about to be over (who says holidays can’t be productive!) and today i’ve achieved quite a fair bit, hopefully i’m ready for tomorrow’s paper :)