Spanish · Pronunciation Guide
el koh-rah-SOHN, three beats — the z is an s and the accent puts the stress at the end.
Three syllables, co-ra-ZÓN, and the accent is load-bearing. The word ends in n, so the default rule would put the beat on RA. The mark moves it to the end. The plural "corazones" drops the accent, because the added syllable puts the default stress exactly where it belongs.
Listen: el corazón
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El corazón es un músculo.
The heart is a muscle.
Listen: El corazón es un músculo.
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"El corazón es un músculo" ends on a word with an accent pulling the stress three syllables back: MÚS-cu-lo. Spanish marks every such word. Say "es un" and the s links into the u, giving e-SOON as one run.
Two things go wrong together: a buzzed z and an ignored accent, leaving a front-heavy "ko-RAH-zon". Hiss the z and put the beat at the end. The r then wants an English curl instead of a single flick. And when pluralizing, learners keep the accent — "corazónes" — when it should disappear, since the default rule takes over.