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.
Wearing glasses will improve your seeing .But a teacher cant force you to wear them.Wear glasses if you can't see the book in front of you or if you can't see the school board.The teacher wants you to wear them so there is no excuse y u didn't do school work or dont understand it.
The universal machine is a weight training machine in the gym.