Question too vague. Resubmit. Are you thinking about physical structures or mechanical ?
The integumentary system protects and covers internal structures.
Epithlieal Tissue
Carapace
Your skin covers and protects your internal tissues and organs.
The skeletal system helps your body keep its shape and protects internal organs.
The external structures of animals protect the animal from harm to internal organs. An example of an external structure is the skin and fur on a bear. The skin protects the internal organs, and the fur protects the skin.
Plasma membrane protects cellular structures. They are made up of lipids
The skin covers and protects the body.
The nuclear membrane covers as well as protects the nucleus.
The skin is the tissue or organ that covers and protects the human body. It is the largest organ of the human body and serves multiple purposes.
The skin is an organ, and it is the organ that covers and protects the body.
Epithelial tissue covers and protects underlying tissue.