Question

The external or internal framework which provides support to the body is called
(a)Supportive chord
(b)Tendons
(c)Skeleton
(d)Muscles

Answer 1

Hint It is the basic supporting framework of an organism and is typically made out of hard, rigid tissue that supports the form of the animal’s body and also protects vulnerable organs.

Complete answer:
The skeleton is the external or internal framework that basically provides support, shape, and protection to the soft tissues and delicate organs of animals. There are different types of the skeleton:
-Exoskeleton: Insects have an exoskeleton that basically acts as a surface for muscle attachment, as watertight protection against drying, as a sense organ to interact with the environment, and also acts as a protective cover. The shell of molluscs also performs all of the same functions, but the only exception is that in most cases it does not contain sense organs.
- Endoskeleton: An endoskeleton is a form of the internal support structure of an animal, composed of mineralized tissue and is typical of vertebrates. Among different organisms, endoskeletons vary in complexity from functioning purely for support (as in the case of sponges), to serving as an attachment site for muscles and a mechanism for transmitting muscular forces.

Additional information:
The various types of skeleton found in different organisms are as follows:
-Sponges: The skeleton of sponges is made up of microscopic calcareous or siliceous spicules.
-Echinoderms: Their skeleton is mainly composed of calcite and a small amount of magnesium oxide. It lies beneath the epidermis in the mesoderm and is within cell clusters of frame-forming cells.
-Fish: In fish, the skeleton, which forms the support structure inside is either made of cartilage as in the (Chondrichthyes), or bones as in the (Osteichthyes). The main skeletal element includes the vertebral column which is composed of articulating vertebrae which are lightweight but strong.

So, the correct answer is ‘Skeleton’.

Notes: The cytoskeleton is used to stabilize and maintain the form of the cells. It is one of the most important structures found in cells, that maintains cell shape, protects the cell, enables cellular motion (using structures such as flagella, cilia, and lamellipodia). Intracellular transport (the movement of vesicles and organelles, for example) and cellular division are also significant functions of the cytoskeleton.