Sir, you are the best ever, sir please don't stop uploading videos, we all Nigerian medical students are impressed to have you, you are a blessing to all medical students of the world, please keep uploading much of embryology videos, like, respiratory, urogenital,cardiovascular, nervous integumentary ,and musculoskeletal system development, embryology of ear, eye, head and neck embryology, and finally birth defects and signaling pathways and molecules, like wnt, hedgehog, fgfs etc

I'm watching this 6 years after production and it is amazing how far Ninja Nerds have come❤

I'm in my 6th year of medical school now. I am watching this to refresh my memory and I just can't help it but smile at how much I used to watch your videos back in the day. Thank you bro ❤

Honestly, you are the best educator I have ever seen in my life. Keep the good job and I wish you all the best in your life.

I don't usually comment on videos, not even on those I like. But you deserve some thumbs up man. Thank you so much!!

I've watched dozens of fertilization discussion. This is by far the most thorough. It helped me digest all the other information. Thank you, thank you.

didn't attend embryology class this semester, now im getting more knowledge of the course than i would have from my professor, your are truly a hero. Big thanks from Morocco.

Love you sir,,salute your hardworking,,you are amazing teacher of the globe,,I just pay fee to university not absorb a single words from university,,I am copying your every lecture and remember,,you are my ideal teacher,,God blessing you,,more than 100 students I spread your lectures and daily consouling,,abundle of thanks

this is the best embryology lecture I have ever seen. Sir, the lecture was too good with all the details of enzymes and differernt secretions.My concepts are crystal clear after watching your video. Thanks!

These videos are a lifesaver with distance learning. Thank you big time.

God I hope my professors explained like this in their lectures. Your videos save my ass once again 😂

I have to pay 1.800 dollars for attending the med school per semester, and here i just got lectures for free... Thanks a lot zach and team, i love you guys, god bless you all👍

This guy is legit the best lecturer ever! It all makes sense with you. Thanks so much!

You just have a way of making these topics easier and more understandable. Thank you so much sir. You're helping a lot of people☺

you made medicine so much easy on me. You're vids are my best friends while studying

Outstanding. One of the best medical videos here in the web!

Im indonesian and there are other who admire your work, i personallu very much thankful for all of your video sir, i must say your effort is pretty much appreciated. And im planning to donate some of my work on your patreon

I love how you add a lot of details and still make everything really understandable, thanks :)

What a way of teaching ..you make me understand each and everything just simply without wasting time.. best way of teaching👍

I just understood this concept in less than 30 mins. Take your flowers🌹🌺. I use to hear of Ninja Nerd before I became a medical student. I'm glad to learn from you sir.

Hi Mr Ninja Nerd Sir, you really teach all of these concepts with so much passion. I am going to pass Anatomy & Physiology because of you.

U r like blessing for medical student like me u made all content very easy to understand ... It's my request plzz never stop making video ..... Loads of respect...

9:24 Changes in sperm for fertilization 1) *Capacitation* -Cleans head -Increases motility 2) *Acrosomal reaction* 3) *Fast block to polyspermy* 4) *Slow block to polyspermy*

This guys is one of the best medical teacher in the whole world !!

I haven't seen such a cool teacher!! It really help to understand quick and kind of grap most of the things.. Yo!! Sir!! Big salute... outstanding lecture.. ever boring topics seem interesting.. when you explain..

Sir, salute forever. Love you..... I'm a DVM student.. Again love from Bangladesh.. 😍😍😘😘😘😍😍😍😍😍😍

This helps me so much with my medical carrer, thank you so much, totally understand every topic i have watched on here 💗

my thanks to you, here from Brazil. you are an amazing teacher. Deserve all the thumbs up and monetization that is possible to have

As a nursing student, i read wide and versatile like am a doctor (though is my wish).... You make it easier and gracious to learn more.... Thank you. 🎉

Trying to get a better understanding of how this process works, and you blew my mind!! So interesting, and fairly easy to follow and understand! Wow! And... Really easy on the eyes! 😉

YOU ARE LITERALLY THE BEST. It all made sense and the whole explanation was very entertaining and fun to watch. Thank you so much

I have not even completed my schooling but when I see those videos I feel like I am learning true Biology and you are 👍👍👍

Thank you so much! You cleared so much stuff for me! My professor let us go over this part on our own and the book was so confusing! 😁

I would not be able to understand or pass my exams and studies without your videos. Thank you so much you are our hero.

Summary- Changes in the sperm- 1. Capacitation- alteration in glycoprotein and seminal proteins that coat the spermatozoal head. Occurs in the uterus Increases motility 2. Acrosomal reaction- The sperm has specific protein that bind to the zona pellucida receptors ,ZP3. Upon binding, acrosomal head opens releasing acrosin and proteases. This creates a hole in zona pellucida. 3. Fast block to polysperny- As the sperm touches the cell membrane, Na+ influx occurs . 4. Slow block to polyspermy- Smooth ER releases Ca2+ ions which activates lysosome to fuse with the cell membrane of occytes. Hydrolytic enzymes are secreted causing degradation of Zp3 proteins and hardeining of cell membrane.

These lectures are really a huge box of gold to me !!!!! Really awesome thanku so much for such a beautiful , amazing explanation !!!!!!!

Helping me get through Anatomy classes one video at a time

This guy does wonders! He is so good at teaching and it's fun to watch! Got a really good grade bc of him.

so far the best vedio explaining fertilisation on a medical level i myself as a post-graduate appreciate your effort thanks alot

Thank you so much. You make everything as simple as it can be. Keep going god bless you 👏🏻

The best explanation, so detailed but easy to follow. Thanks so much!

Hey, I love your videos. They have helped me so much throughout my studies. You are honestly a god send

Really i appreciate the contents you make. these are so coherent a question comes to the mind and next the answer comes. please keep the excellent work. I would like to see videos on Cell cycle, mitosis and meiosis.

Dude I can't believe I'm just finding your channel. This is amazing

your lectures are very very helpful to me😊. Thanks for making embryology easier 🌼

Can't thank you enough, thank you for making it available, you are a superhero a real med ninja 🤗🤗

When it comes to Ninja nerd lectures , my video quality increases to 720p ...❤️

THE WAY HE DELIVERS THE POINTS! you cant be bored at all!

Honestly, thank you so much for your videos Sir. You are truly a blessing. Seriously thank you. You’re a lifesaver🥺. FromZambia 🇿🇲

Can you please consider making anatomy videos like these please?? You're the best at explaining

You my friend, have a natural gift/ talent. Keep up the great work.

I lack to express my joy, you explanation is excellent you're the best ever

I really admire you sir....u help me a lot going through med school...i really wanna see u in person one day...🙂

You're the best , and your videos are the best medical videos I've ever seen 💜💜💜💜💜💜💜💜

From india.... i send you a lot of wishes man💐... you are a great professor.... i really appreciate your work

You explain and simplify things in a good way... I always understand

Thanks a lot for these amazing videos. A blessing in this lockdown

Hey, I'm from Brazil. Your classes help me a lot, I'm in Nurse school.

Thank u bro...For clearing this whole concept in a very easy way...from India

Asslamo Alaikum SR,Your lactures are very Great very Helpfull and comprehensive! Your style of teaching is also very great!! Thumbs up for you struggle! Please make lecturers on complete embryology, and Monosaccharide Metabolism, xenobiotic metabolism,Feed fast cycle.

Thank you very much, i was confused,but you gave me the all points 😍😍

Your videos are very helpful! I was trying to count how many times you say "actually" but I lost track at about 100. lol

perfect... I am an Arabic medical student..and your videos are very simple and useful..thank

Hello Sir first of all thank you so much, Allah bless you you make videos for free I am watching you from Kabul Afghanistan. you may do not know how helpful are your videos specially when you made all free for student like me who does not have money to pay for learning again thanks a lot we all pray for you and your team have long life and blessed and live all healthy and great

One of the best teachers out there! Kudos

THANK YOU SO MUCH!!! Your tutoring is so very helpful!

I'm watching your videos alongside my lecture notes and it's ten Times more fun

حرامات انتهى الفيديو و الله الواحد ميحس بالفيديو من كثر المتعة اليقدمها زاك thank you zach 😍! it was unbelievable explanation

Your videos are all I watch ....I actually got a B from this lecture in my today exam thanks 🙏 ✅

wow you are the best teacher ever.....i enjoy your videos ,,,thanks a million

You are my lifesaver. I couldnt understand anything from my professor. Love u from Thai Medical student ❤.

Another topic crystal clear. Kudos to you

You are a real MVP!! I love you!! Don't stop what you're doing!

Your videos are the best! They have helped me tremendously.

this vid is really helps me understand more than my own teacher:)

You are th smartest person in the world at all, love you dude, thank you for your affords

Don't stop ur lecture sir we need ur classes 🙏🙏🙏Namaste 🙏 🙏 🙏

GOAT prolly the best teacher ive ever seen

THANK YOU SO MUCH, I HAVE QUIZ TOMMOROW AND UR A SAVIOR

man you are amazing, i'm so lucky that i found you

amazing and amazing explanation. Thank you very much

you are the smartest human I Know. You took my through Nursing School

Wow !!! Such a beautiful explanation Alot thanks✨💓 to figure out such concept easily 👍👍

Outstanding, ❤❤❤ Respect & love from Pakistan.

Wow! One would think it's world war in these bodies of ours. The number of events happening at the same time is insane. Thank you, this is well understood.

Bestest ever!!!! Why i didnt find you in my first year of med school!!!! 😍😍😍😍😍😍

This guy just makes everything so easy

Excellent explanation. Best to be in the pre-nuptial councilling for couples before wedding. And good for pre-medical students before the seminar on reproductiive system of man and woman.

Thanks for the lecture. It is helping me a lot. The number of sperm that get to the fertilization site is actually about 200, but one usually fertilizes the oocyte.

Amazing! I really appreciate this hope you don't stop......I need you to complete my medicine course

Lots of Love man! Thank you from the bottom of my heart

your videos are such useful , please continue , and thank you a lot

Bro you have a wonderful teaching skills and good subject knowledge

Nursing student from Kenya am enjoying the lessons.keep it up

thanks for saving our report!!! :)

this is the only channel that i actually waant to remind me to hit the like button at the end of the video

Thumb up! You make all the things understandable

Cheers man... You're good at this... It really helped 🤜🏾🤛🏾😎

brother, you are special. please dont stop

Thank you so so much, you are really the best!!