Bones: Made of active connective tissue Stores calcium phosphate and minerals Hematopoiesis~blood cell production 206 bones Axial or perpendicular | | Vertical. Appendages/others Shape: Long bones longer than wide Short bones short cube like Flat bones thin ones Irregular bones can't classify Compact bone smooth Spongey porous: cross hatching supports (trabeculae)~resist stress & bone marrow red=blood cells yellow =fat Flared ends=epiphyses Middle=dialysis Middle layer=medullary cavity Osteons: cylindrical/weight baring/cented of bone (animation of bone being cut in half they are outside the center hole of bone, and appear to be like frog eggs) Each "frog egg" is a lamellae and filled with collagen fibers that run in same directions. Central canals: hold nerves and blood vessels~nutrients Lucanae spaces by central canals~astrocytes: mature bone cells that monitor and maintain your bone matrix Bone remodeling~ Osteo blasts & Osteo clasts #1. O. Blasts: bone makers Cartilage is framework for bone #2. O. Clasts: bone breakers ~resorption, apoptosis (self destruct)
I'm finally going to reach out and thank you via a comment... little do you know, I am a nursing student and I have used your videos for every biology course I've had to take as a quick refresher before exams. I cannot thank you enough for these videos! You explain it in a language that I can understand as opposed to the boring lull of the borderline medical journal of a textbook that I have! (why do they insist on being so sleep provoking?!) So, THANK YOU, your channel rocks and I recommend them to all my fellow students that need a quick rehash. :)
Because studying anything to do with health or medicine can actually get boring but it's people like us that eventually save lives. (that's my motivation)
As a nursing student, we constantly have to go back to anatomy and physiology to understand what happens during disease processes. These videos are super helpful and so much more convenient compared to flipping books open. Thanks so much for these! I was super impressed by how detailed and accurate your A&P videos are.
I am a current A&P student in college and I couldn't understand this from my own teacher. This video definitely helped me and broke it down in a way she couldn't. Keep up with these videos! They help so much
I'm so thankful for wonderful people like you. I can stare about my books for hours feeling frustrated about the point not getting through. Y'all make learning easy and fun! If only I could get my BS from Crash Course instead of my college.
I wish you would slow down when you speak, sometimes I'm trying to process what you'd just finished saying and in that span of time you've already moved on to two other things. Thanks so much for these videos though they're really helping me with my anatomy class, I'm a visual learner xx
Glaerdrune, you'er right, you can....it would be nice if they'd include a .75 setting though. (After all, they offer more options to speed up than to slow down.) At .5, he's just as hard to listen to but for the opposite reason. ...lol....I'm an American but teach Science here in Thailand, and would like such an option, as most of my kids are non-native speakers. Ya hear, that, RU-vid admins? We want 75% playback speed!!
You want to slow down read a book for few hours and study. Once you feel you ok with topic and need a quick refresh, watch it.. And it's going to be a great review. English is my second language and I understand him perfectly. That's actually a good practice, because in med school that's how studying should be.. Very very fast
Spooky, scary skeletons ♫♪ send shivers down your spine♫♪ Shrieking skulls will shock your soul ♫♪ Seal your doom tonight ♫♪ Spooky, scary skeletons ♫♪ speak with such a screech ♫♪ You'll shake and shudder in surprise ♫♪ when you hear these zombies shriek ♫♪ We're so sorry, skeletons♫♪ You're so misunderstood ♫♪ You only want to socialize ♫♪ (but I don't think we should) 'Cause Spooky, scary skeletons ♫♪ shout startling, shrilly screams ♫♪ They'll sneak from their sarcophagus ♫♪ and just won't leave you be ♫♪ Spirits, supernatural ♫♪ are shy, what's all the fuss? ♫♪ But bags of bones seem so unsafe ♫♪ It's semi-serious! ♫♪ Spooky, scary skeletons ♫♪ are silly all the same ♫♪ They'll smile and scrabble slowly by ♫♪ and drive you so insane! ♫♪ Sticks and stones will break your bones ♫♪ They seldom let you snooze ♫♪ Spooky, scary skeletons ♫♪ will wake you with a BOO! ♫♪♫♪♫♪♫♪♫♪♫♪♫♪♫♪♫♪♫♪♫♪♫♪♫♪♫♪♫♪♫♪♫♪♫♪♫♪♫♪
Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/2SrDulJ
Dude you are amazing!!!! U make me love the subject! Don't listen to any negative feedback! Keep going! Love the way u talk so fast! So don't give it up!
Yes. Maximizing time is most appropriate when creating videos, and perhaps, the viewers shall adjust the speed into 0.75x if they can't understand fully because the channel never asked them to watch their videos. Hahaha, This is just my opinion.
Currently pulling an all nighter watching your videos for my exam tomorrow. I wish i found you at the beginning of the semester. You simplify everything greatly. Idk why professors teach a whole bunch of other junk that wont even be on the test. You get straight to the point. Love it
As a 14-year-old Iranian student, your videos really really help me to improve my English and knowledge of Biology at the same time. I watch your videos before my classes & they help me to stay on the top of my studies. Thank U!
Currently studying to receive my NASM personal traininer certification, I'm terrible at studying but I have not only found but also understood all the material on the test through your videos, thank you so much I will definitely be contributing to the channel through patreon!
Hello- ur video really help me understand but can you please make a video more about the bone the endochondral ossification and intramembranous ossification about there formation of steps:)
I have to do a 20 slide "slideshow" for a final. My textbook is so confusing. literally bolds and italicizes everything that is important. Crash course is the only reason I'll be passing this year. I'm just watching these videos. I won't even bother reading. Thank you Crash Course! You guys are the absolute best!
well made videos with lotta effort put into it...but i must say, doesnt suit my style of learning..too fast for starters lol...also lotta unnecesary stuff
Even though certain life circumstances prevented me from pursuing my lifetime goal of becoming a physician, I still love learning all I can about our miraculous human form! I am especially interested in diseases and rare diseases that can, and do, afflict our mortal selves and the advances (and failures) that so many dedicated researchers, scientists, physicians and nurses have devoted their careers to understand, and to hopefully discover the treatments and cures so many us are looking forward to! Kudo's to you all!
this is sooo weird but you guys are kinda synced up with my biology class lessons...you uploaded this video on the week we started learning about bones and stuff,and the same was with the nervous system and the "vision" one,where we started learning about eyes.... reaaalllyyy curious
I have a hypothesis id like to express, my idea is that while in null g or zero g the bone cells are tricked into thinking that your in the fulid cavity called the womb, that simulates null g. Why do i say this, well i personally talked to a nurse friend of mine and he mentioned that newborns have very rubbery skeletons, more cartilage and connective tissue than calcium phosphate that is our bones. If our bones think there in a womb like state then they want to get ready for birth, that involves reducing the mass of our bones in our body. It is just a hypothesis, if anyone has anything thed like to add I welcome it.pardon any grammatical mistakes it natural.
Collin Bruce Yes Collin, I think it is a very plausible hypothesis. The zero gravity could trigger the signalling of osteoclast activity and inhibition of osteoblast cell cycle. There has been report published that supports this hypothesis : www.ncbi.nlm.nih.gov/pubmed/23637819 But whether or not this is analogous to fetal development in the womb is yet to be determined. I think somebody should start working in this direction to establish this.
Thank you Hank. I am a AP Psych and Health teacher and am currently studying RHIT for a certificate from ELAC. Your videos were informative, entertaining, fast and I learned things I did not know before. I will change how I teach Health and AP Psych thanks to Hank. You are a live saver!
I just wanted to say thank you for all your videos, and making them interesting and funny while teaching. I home school my 10 year old son, and he absolutely enjoys watching your channel
You should cut to the chase. I don't care about astronauts. I am here to learn about bone anatomy. I had to skip 2.5 minutes of video just to get to the topic that the title of the video was talking about.
Personally, I enjoy the mini stories as they serve as a point of reference to the bigger concepts that he goes over. Khan academy might be better for you if you just want straight facts.
Though you might find it boring, those astronauts are experiencing bone loss in space on the ISS for the sole purpose of understanding why it happens so fast in space so that in the future, other astronauts do not have to suffer. So I think both men deserve a honorable mention.
I'm a Pre-med student starting medicine soon. Our Prof came today and said "you guys have been performing excellently so far, lets throw in some MD anatomy in your skeletal system content, you'll thank me later". Long story short, here i am learning about the skeletal system and then I gotta learn the name of 50 bones after this video. Feelsbadman
Hank you honestly are my favourite everything! You are helping me through SO many classes where my teacher sounds like hes speaking friggin German when explaining anatomy. When I become an RMT, you have a free massage ready for you as a thank you!!!! I had NO idea just how medical this profession is going to be or the training to get there. You are saving me!
Great episode as always! I met John Glenn sometime around 1996 and he'd gone up on the shuttle as part of an experiment on physiologic changes in space. He'd had to work out on a stationary bike every day at regular intervals. He said an extra bonus was that he was a few nanoseconds (milliseconds? I can't remember) younger than he should have been because of relativity. I also recall that he was taller than I expected.
If the viewers don't know how to slow down the speed even at least up to 0.75x in the settings of this video, then maybe yes, he should slow down in talking.
