muscles become longer, but thinner
Do you mean "contract". Well, when muscles contract they get shorter and fatter. When they relax they get longer and thinner.
The segments elongate when the circular muscles contract.
The diaphragm and intercostal muscles tighten and contract during inhalation, causing the rib cage to lift and expand, resulting in a shorter length. During exhalation, these muscles relax, allowing the rib cage to lower and return to its longer length.
No, muscles only do work when contracting. Thus muscles come in opposing sets that pull in opposite directions.
It becomes shorter.
False
They become longer.
The bar will contract (get shorter) as it cools down, and expand (get longer) as it is heated up.
Longer because if you think about it, that stretches it out.
In the northern hemisphere, USA and UK included, during Spring the days become longer and the nights become shorter. Conversely, in the southern hemisphere, Australia, and South Africa included , during the same period the days become shorter and the nights become longer. Depending on which side of the Equator you are on , the seasons and daylight hours are reversed. During Autumn (Fall)(northern hemisphere), the whole process is reversed in both hemispheres.
Your bones are solid and fixed - they cannot move by themselves because they have no flexibility. Your muscles are used to move your bones because each muscle can contract or relax - get shorter or longer - and therefore cause the bones to move.
Days get shorter and nights get longer until the winter solstice, at which point the days become longer and the nights become shorter.