when a muscle contracts,it becomes
cause pupillary constrictive muscle contracts
A muscle becomes shorter when it contracts.
when the muscle shortens (contracts), the two bones come closer together, isometric contraction excepted.
While there are a lot of muscles involved, the most important muscle of respiration is the diaphragm.
A muscle that contracts shortens whereas a muscle that relaxes lengthens.
during a hiccup, the diaphragm contracts and causes air to be sucked abruptly into the lungs. the action of the air unexpectedly rushing into the lungs causes the epiglottis to close, thus creating the hiccup sound.
because the muscle beneath your lungs twichers and hits your lungs and your chest and makes you hiccup.