Boardling

Biology lessons, one board at a time

Each lesson explains one idea in about three minutes while the notes are built on a board in front of you. Every page has the video, written notes, a practice question, common mix-ups, and the finished board to copy into your own notes.

Endocrine system

3:20
HPA axis
How stress travels from the brain to the adrenal glands: CRH, ACTH, cortisol, negative feedback and the daily rhythm.
3:13
Tropic vs non-tropic hormones
Which pituitary hormones act on other glands, the FLAT PEG trick, and how to find the gland that broke.
3:33
Steroid vs peptide hormones
Why insulin works in seconds and cortisol takes hours: solubility, receptors, genes vs cAMP, and the amine trap.

Immune system

3:13
Clonal selection
How one matching B cell is picked and copied into ~1,000 cells, then becomes plasma and memory cells.

About Boardling

Boardling is a biology lesson series made by the team behind Instaboard, a board app for organizing notes with cards. Each lesson builds its notes live on an Instaboard board, and you can copy that board for free.

How the lessons are made: the narration is a synthetic (text-to-speech) voice, and scripts and notes are written with AI help, then checked against textbooks such as OpenStax Anatomy & Physiology. Each lesson page lists its sources and the date they were last checked. If you spot a mistake, email support@instaboard.app and we'll fix it.

New lessons come out on the Boardling YouTube channel.