This site is about learning: Especially learning using Drawing and Sketching (and see my free downloadable book at: pdheid.blog). To learn these topics, I'll tell you what works for my students: Make your own sketches from the videos, and practice redrawing the sketches while thinking about the topics. My students learn more, and they learn faster, when they practice their own sketches. These videos contain essential information for problem solving in the courses I teach. A typical class session uses two to five videos. The videos are organized into playlists on related parts of a topic. In many playlists, the videos make the most sense if watched in order. I don't yet have videos for all of the topics I cover. When I teach these courses next, I'll add more videos. Viewers are welcome to contact me and request topics -- I'll try to add those topics if I feel I would use them in my classes. I can also revise or replace videos that don't make sense!
Just wanted to remind you that there are still people learning from your videos. Thank you for what you have done. I came from your digestion system part 4 as I was attempting to understand how sodium and chloride ions are absorbed into the body. Your video gave me a good foundation to build on.
This video was pretty good. Before watching this video I was unable to understand the structures of carbohydrates but now I have cleared all structures. Thank you so much sir.
This is very fascinating (to me, at least). These organisms are so simple that you can probably make a map of every cell in their body, and yet they’re still almost unfathomably complex if you look closely enough. It makes me wonder if some ancient organisms like dickinsonia were some form of giant placozoan-like thing. That’d be weird to imagine, a meter long, more organized cousin of the placozoa. It’s also fascinating to me how similar those crystal cells seem to some structures I’ve heard of in jellyfish that fulfill the same function! They’re kinda creepy to me in how they effectively walk on their cilia, are microscopic saline hot pockets and can tear themselves apart to reproduce. At 3:50 though, that looks a lot more like an illustration to me than an electron micrograph… my only other complaint is that this video isn’t longer!
Excellent video! I'm writing an assignment on avian salt glands and would love to know your sources. I was also unable to access the book you have linked in your bio
Thank you so much for the details of the closed tubes. Now it makes sense. Is there any evidence for this issue, books or studies, or is it just your personal logical conclusion?
Bird lungs are so freaking cool! This is the first explaination I’ve seen that goes through whats going on in both sets of air sacs during inhales/exhales (instead of following a single breath), and its also the first time I’ve seen countercurrent exchange explained. Freaking fascinating and you make it so clear to understand too!
My professor showed our class your video series on bacteria and they're really good. Concise and straight to the point while also being as simple as possible. I love your videos
Very nice, best explanation i could find. Now my question, what happens if birds hold their breath? (eg penguins) do they move the air back and forth, or only blow up posterior and slowly fill up anterior while still getting the oxigen?
The water molecules are actually broken down by the removal of the electrons from that atoms that make up the water molecules, IE, hydrogen and oxygen atoms. You see it is that act of taking the electrons away from the atoms that make up the water molecules that breaks the bonds of the water molecules and it doesn't mater how one goes about doing it. You see the atoms are sharing electrons and if those electrons are removed the water molecules simply fall apart into it's component atoms, IE, hydrogen and oxygen gas atoms at ATM. This is something that is missed by most of the scientific community as this relationship is very important in going about breaking the bonds of the water molecules outside of Dr. Faraday's electrolysis method. Very nice explanation and presentation.
Excellent, concise video - thank you so much. The only thing I have to mention is that the explanation of emulsification of fat globules by bile is a bit hard to understand. But perhaps that may be a fault on my end.
The valves are so called aerodynamical ones. They are obtained by connecting the pipes to the main tube at right angles. For example during inhalation air goes straight to the posterior sacs situated at the end of the main tube. Anterior sacks are not so efficient in taking the air, as it passes quickly and does not intend to turn at the right angle into the opening leading to the anterior sacks. It means that between two ends of the lungs a differnce of pressure is created. In my opinion muscular valves would be better, yet the aerodynamical ones probably proved to be sufficient enough.
Wait, so are you saying that there is no actual closure of the air pathways, and ONLY a differential in the efficiency of the flow paths for different directions? O are you saying that both apply?
