Subjects
Careers
Maths
Biology
Chemistry
English Lang.
History
Energy transfers (a2 only)
Infection and response
Homeostasis and response
Responding to change (a2 only)
Cell biology
Organisms respond to changes in their internal and external environments (a-level only)
Biological molecules
Organisation
Substance exchange
Bioenergetics
Genetic information & variation
Inheritance, variation and evolution
Genetics & ecosystems (a2 only)
Ecology
Cells
Show all topics
World war two & the holocaust
Medieval period: 1066 -1509
1f industrialisation and the people: britain, c1783-1885
2m wars and welfare: britain in transition, 1906-1957
1l the quest for political stability: germany, 1871-1991
Britain & the wider world: 1745 -1901
2d religious conflict and the church in england, c1529-c1570
The cold war
1c the tudors: england, 1485-1603
Inter-war germany
2j america: a nation divided, c1845-1877
2n revolution and dictatorship: russia, 1917-1953
2s the making of modern britain, 1951-2007
World war one
Britain: 1509 -1745
Show all topics
6
0
Nikita
15/03/2023
Biology
Fertilisation - unit 4 wjec biology a-level
The fertilization process in human reproduction is a complex series of events leading to the formation of a zygote and subsequent embryo development. This summary covers key stages including sperm capacitation, acrosome reaction, cortical reaction, and early embryo development, as well as the formation and functions of the placenta.
15/03/2023
408
18
753
11/10
BIOLOGY - Menstrual Cycle
Menstrual Cycle stages and the 4 hormones.
102
1746
10/11
Hormones & Homeostasis summary
hey guys, here is summary of topic in biology hormones and homeostasis. i hope u guys find it helpful . it helped me to get grade 8-7 in science. pls follow for more and like 👍
7
779
11/9
HOMEOSTASIS & RESPONSE: Hormonal control, blood glucose, menstrual cycle + plant hormones
Notes on hormonal control, regulating blood glucose, the menstrual cycle, contraception, fertility treatments and plant hormones — GCSE AQA Biology: Homeostasis and response
6
79
10/11
Menstrual cycle
Talks about what happens on what day of the female menstrual cycle
17
647
10/11
GCSE AQA Biology Puberty & The Menstrual Cycle
Revision notes for the section of Puberty & The Menstrual Cycle of GCSE AQA Biology Paper 2
9
215
10/11
Menstrual Cycle
Notes on the menstrual cycle from the topic “Hormonal Coordination” for AQA GCSE Biology Higher Tier Paper 2.
Average app rating
Pupils love Knowunity
In education app charts in 17 countries
Students have uploaded notes
iOS User
Philip, iOS User
Lena, iOS user
Nikita
@nikitaxo8
The fertilization process in human reproduction is a complex series of events leading to the formation of a zygote and subsequent embryo development. This summary covers key stages including sperm capacitation, acrosome reaction, cortical reaction, and early embryo development, as... Show more
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
The process of fertilization in humans involves several intricate steps, from the meeting of sperm and egg to the formation of a zygote and its subsequent development into an embryo. This page covers the key stages of fertilization, early embryo development, and the formation and functions of the placenta.
The journey begins when spermatozoa swim to the fallopian tube to meet the secondary oocyte. As they travel, sperm undergo capacitation, preparing them for fertilization.
Vocabulary: Capacitation is the process that allows sperm to penetrate and fertilize an egg.
When capacitated sperm reach the oocyte, the acrosome reaction begins:
Highlight: The first sperm to penetrate the zona pellucida fuses its membrane with the oocyte's, incorporating its genetic material.
Immediately after membrane fusion, the cortical reaction occurs to prevent polyspermy:
After fertilization:
Definition: A blastocyst is a structure formed in early embryonic development, consisting of an inner cell mass and a fluid-filled cavity called the blastocele.
The blastocyst embeds in the uterus using trophoblastic villi, which grow into the endometrial layer to form the placenta. This process occurs between days 6-10, after which the woman is considered pregnant.
The placenta is a temporary organ formed from both maternal and fetal tissues. Its key functions include:
Highlight: The placenta's structure, with its chorionic villi, increased surface area, and counter-current flow, allows for efficient exchange of materials between mother and fetus.
Several hormones play crucial roles during pregnancy:
These hormones work together to maintain pregnancy and regulate fetal development.
App Store
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
