UTXOs behave in a similar fashion. Just as you can't tear off a piece of your $10 bill to pay for your coffee, you cannot send part of a UTXO. If you want to send someone 3.75 BTC, but only have a UTXO worth 10 BTC in your wallet, you must send the entire UTXO to the recipient and then receive change, just like you would when paying in cash. (Of course, this process is handled by the blockchain protocol, and doesn't require you to trust the recipient to return your change). As such, when you made this transfer, the recipient would receive 3.75 BTC, and the remaining 6.25 in "change" would be sent back to your address as a new, smaller UTXO.