jtotheizzoe

jtotheizzoe:

Introducing Victoria - Frankenstein MD Episode 1

Victoria’s show is designed to be sort of a video lab notebook, part educational, part experimental. YouTube already has some pretty great science shows (*cough*cough*) but I’m happy to welcome Victoria to the fold. And Iggy too, I guess.

In this episode, in addition to meeting the main characters and hearing some inspiring words about the importance of failure in the scientific method, we learn a bit about cardiac electrophysiology, those nerve impulses that control our heartbeat.

I find that GIF hypnotic. The human heart has its own pacemakers built in. One is known as the sinoatrial (SA) node, the other as the atrioventricular node (AV). These are the upper and lower red dots above, respectively.

Cardiac cells are interesting because they are sort of like nerves and muscle cells combined, they can do work, but they can also propagate electrical impulses (although we should be clear, they are definitely classified as muscle cells). 

Cells of the SA node sort of “leak” charge at a constant rate, which makes them fire (or send an electrical impulse) at that same constant rate. The result is a nice rhythmic heartbeat, controlled by its own cells.

When a heartbeat is initiated by a stray impulse at the bottom (ventricular) region of the heart, that’s what is known as a premature ventricular contraction, or PVC. That’s what happens to Iggy in this episode.

Single, isolated PVCs are pretty harmless, and most of us probably get them from time to time without even noticing. Leave it to Iggy to kill himself by trying to fix a problem that doesn’t exist.

At least Victoria was there to shock him back to life! Wonder if she’ll do that again at some point…?

smartgirlsattheparty
The fact is, like it or not, you still live a world where gender matters. Where gender controls not just the entire course of your life – but the lives of women all over the world. Every second, a child will be born female in a country where she will persecuted for this random biological occurrence for the rest of her life. So before you hold up your anti-Feminist placard proudly and smile at your own sense of empowerment, think not what Feminism can do for you, but what it can do for that one girl. She needs someone to stand up for her. That someone could be you.

The Thing ‘Women Against Feminism’ Fail to Understand

(via feminspire)

Just because your life is “unaffected” by your gender, that doesn’t mean the rest of the world is so fortunate.

(via fuck-yeah-feminist)