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.
Answer:
B. Gametophytes of seedless vascular plants
<span>Ferrite Magnets (</span><span>ferromagnetic or ferrimagnetic) </span>are the kinds of magnets in a fridge magnet. <span>A refrigerator magnet is made of </span>powdered ferrite<span> (iron rust) and a liquid binding agent of </span>plastic<span> or rubber. The two are heated, mixed together, and poured into a sheet mold which is then exposed to a strong magnetic field.</span>
Once retinal has absorbed a photon which initiates effects that create nerve impulses, the impulses get carried to the brain, which then processes the impulses along with other signals, ultimately allowing the eyes to see.
