Structural Organisation in Animals Test 21

Areolar connective tissue is a loosely arranged connective tissue that is widely distributed in the Body and contains collagen fibres, reticular fibres and a few elastic fibres embedded in a thin, almost fluid-like ground substance.
Fibroblast - responsible for synthesizing (creating) the collagen, elastin, and reticular fibres of the tissue.

The type A gelatin is produced by boiling collagen in an acidic solution while type B gelatin is produced by boiling it into an alkaline solution. Mostly animal parts are used for making gelatin which comes from cattle and pigs or sometimes leftover from meat and leather processing.

Fibrous joints are connected by dense connective tissue, consisting mainly of collagen. These are fixed joints where bones are united by a layer of white fibrous tissue of varying thickness. In the skull the joints between the bones are called sutures. Such immovable joints are also referred to as synarthroses.

The nucleus pulposus (NP) is a rounded region located within the center of the Intervertebral Disc. The NP is thickest from superior to inferior in the lumbar region, followed in thickness by the cervical region; it is the thinnest in the thoracic region.

A ligament is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and keep them stable. Ligaments can be found connecting most of the bones in the body. The function of a ligament is to provide a passive limit to amount of movement between your bones.

Option D is te correct option as because calcified cartilage is present in frog's Pelvic girdle.

Osteoclasts are large cells which dissolve the bones. They come from bone marrow whereas Osteoblasts help in formation of bones. They make a small bone called 'osteoid' made by some proteins nd collagen.

Bone consist of living cells embedded in a mineralized organic matrix. This matrix consists of organic components, mainly type I collagen- organic referring to materials produced as a result of the human body and inorganic components, primarily hydroxyapatite and other salts of sodium and phosphate.

Calcium phosphate predominates in the bone matrix.
Bone has 60% organic component of calcium phosphate while rest 40% inorganic component of bone is collagen fibre and a protein called ossein.