Answer:
The Z lines and H- zone shortens during the muscle contraction.
Explanation:
Sarcomere is the area between the two Z lines. The Z- lines are present in the centre of I - band and H - zone is present in the A - band. The actin filaments which are thin filaments present in I- band and contracts, slide over the myosin filament during contraction.
The I - band, H- zones are became shortens as they are thin than the A- band. It is anisotropic band having thick myosin filaments. They are not flexible and remain in its constant shape during the muscle contraction.
After the muscle contraction, the A- band and the H- zone comes to their original shape. In other words, the sarcomere shortens and comes back during muscle contraction, and relaxation.
Explanation:
<em>Characteristics</em><em> </em><em>are</em><em> </em><em>as</em><em> </em><em>under:</em>
<em>1</em><em>.</em><em> </em><em>Living</em><em> </em><em>things</em><em> </em><em>respire.</em><em>.</em><em>.</em>
<em>2.</em><em> </em><em>Living </em><em>things</em><em> </em><em>can</em><em> </em><em>move</em><em>.</em><em>.</em>
<em>3</em><em>.</em><em> </em><em> </em><em>M</em><em>a</em><em>de </em><em>uo</em><em> </em><em>of</em><em> </em><em>cells</em><em>.</em><em>.</em>
<em>4</em><em>.</em><em> </em><em>Can</em><em> </em><em>Reproduce</em><em>.</em><em>.</em>
<em>5</em><em>.</em><em> </em><em>They</em><em> </em><em>carry</em><em> out</em><em> </em><em>various</em><em> </em><em>Life</em><em> </em><em>pr</em><em>o</em><em>cesses.</em><em>.</em><em>.</em>
Answer:
The two factors are:
• The kind/type of surface involved.
• The force that the surface are being pushed together.
Explanation:
Friction can be said to be the general term used to describe the force that one surface exert on another when they rub against each other.
When the surface is partially not smooth or totally rough, a greater force is been needed to move one surface past the other.
The weight of the can also significantly be a key factor. This is where the need to friction reduction come to play a role; and need for friction reducers like lubricant, rollers etc helps.
