Answer: They cannot bend or move easily, they are not flexible as normal cells and they can block the blood flow.
Explanation:
Sickle cell or sickle cell disorder( SCD) is a group of red blood cell disorders that are inherited and they cannot bend or move easily in a human body.
A Normal cell is round-shaped and normal cells can move through blood vessels. they are carrying oxygen to all parts of the human body and sickle-shaped cells cannot do that. A Sickle-shaped cell can block that blood flow and it can cause many problems and diseases in the human body.
A, because in all, stretching is to reduce muscle tightness and relax muscles. It also can be used as a warm up for sport activities, like a jog, or running a mile, etc.
It's also used a stretch warmup by P.E. Teachers sometimes. If you search up dynamic stretching it shows many stretches, and people do these all the time to prepare for exercise, or to loosen up tight muscles.
