Anatomy

During exercise, our ________________work really hard.

Tiny ________________ inside muscles repeatedly make them stretch and relax.

Extensive stretching of muscles can lead to the ________________ connecting them to our bones tearing, or even breaking.

The injery can cause painful ________________, or more serious ________________, which may take a long time to heal.

Intensive exercise is beneficial to our health. It increases our heart rate, which improves our blood ________________.

During intensive exercise our ________________ quickens.

When breathing becomes quicker we take in more oxygen through the many air ________________ leading to our ________________.

Another positive aspect of exercising is that our skin produces ________________, which is a way our body releases toxins.

Some people can't clearly see objects which are far away because of the condition called ____________ .

How do we call any tubes of the body for air, food ets. to move through?