From 1:58 in the video
How do macrophages destroy invading microbes?
They engulf microbes, trap them inside a membrane, and break them down with enzymes.
Pausly turns a YouTube lesson into flashcards. Paste a video link, sign in, and choose how many cards you want, up to 20. Each card is written from the video's transcript and linked to the moment it came from, so a card you miss takes you straight back to the explanation.
Use a public YouTube video with captions or a transcript. Your link is kept in this browser while you create your account.
After sign-in, the video opens with flashcard settings ready. Pick how many cards you want, up to 20, and the language. Nothing is created until you confirm.
Flip through the deck and mark what you knew. At the end, study the cards you missed again, or jump to the moment in the video each one came from.
Pausly made these cards from Kurzgesagt's video on how the immune system fights a bacterial infection. Each one points to the moment in the video it was written from. They appear here exactly as generated.
From 1:58 in the video
They engulf microbes, trap them inside a membrane, and break them down with enzymes.
From 2:16 in the video
They signal blood vessels to release fluid into the affected tissue, causing swelling, and release messenger proteins that communicate the infection’s location and urgency.
From 2:26 in the video
They attack microbes and generate barriers that trap and kill bacteria, but their aggressive activity can also kill healthy cells.
From 3:32 in the video
They collect material from invaders, display fragments on their surface, and travel to a lymph node to find a helper T cell that recognizes those fragments.
A flashcard is a small test: you see the question, you try to answer, then you check. That makes it a form of practice testing, one of only two study techniques rated highly useful in a major 2013 review of learning research. Watching a lesson again feels productive because the material looks familiar, but recognising an explanation is not the same as recalling it. Cards built from the video you just watched turn that lesson into questions you can answer without it, and the ones you get wrong show you exactly which part to revisit. For the whole method, read our guide on how to study from YouTube videos.
Good cards hold one idea each and ask how or why, not just what. Compare "What is a macrophage?" with the card above that asks how macrophages destroy microbes: the second forces you to explain a process, which is what an exam will ask you to do. Keep the answer short enough to say out loud, and keep the link to where it came from, so checking a card takes seconds instead of scrubbing through the whole video. Cards are written from the transcript, so a diagram or equation that only appears on screen may not make it into the deck. Note those details yourself while you watch.
Spreading reviews out beats doing them all at once. For a test a week away, a large 2008 study found the best gap to be a day or two, growing as the test gets further away. Pausly does not schedule reviews for you yet, so go through the deck right after the video, again the next day, and again about a week later. After each pass, study the cards you missed on their own before you move on.
Not yet. Your cards stay in your Pausly workspace, where each one links back to its moment in the video.
Up to 20 per deck. For a short lesson, 10 to 15 cards usually cover the main ideas without padding.
Public videos with captions or an available transcript. Pausly reads what is said, so silent demonstrations and on-screen-only content may be missed. Private or caption-free videos may not work.
Yes. You choose the language the cards are written in.
You can start for free. Making a deck uses part of your weekly usage, and Pro gives you more.