The reason the contract and relax is because they move you arms up and down. When you straighten your arm, the bicept relaxes and the tricept contracts. When you pull your arm up ( flex ) the bicept contracts and the triceps relaxes.
By the way, I'm 11!
When you tense a muscle, you are tightening it or contracting it. The opposite is to relax.
I felt very tense and stressed out. A tense muscle can ache. The teacher asked students to identify the verb tense used in the sentence.
What happens to the bones when muscle shortening
If "happens now" means present tense, no. Told is the past tense of tell.
The main cause of tension is: when your angry you tense your muscle. Or wether you on a scary ride you get scared and tense your muscles then
muscle contraction
maybe a tense jaw
The Platysma muscle in tense during shaving
When a muscle contracts, it shortens in length.
you have then stretched your tendon / muscle beyond the normal range .
after a long period of exercise a muscle can cramp
when a muscle cramps