Translation of "distender" into English

Estou vendo coisas ou o abdômen está distendido?

Am I seeing things, or is his abdomen distended?

Eu o usava em puros sangues quando distendiam um musculo.

They use it on thoroughbreds when they pull a muscle.

Acho que distendi um músculo da perna, mas valeu bem a pena.

I think I strained a leg muscle, but it was well worth it.

Quando as válvulas falham, o sangue se acumula sob elas, fazendo as veias se distenderem, transformando-se nas chamadas veias varicosas, ou varizes.

When these valves fail, blood forms pools below them, causing the veins to distend and become what is known as varicose veins.