The supportive skeletal structures in the human external ears and in the nose tip are examples of:
Correct answer: D. Cartilage
- A. Ligaments
- B. Areolar tissue
- C. Bone
- D. Cartilage
Explanation
Cartilage is a semirigid supportive or skeletal connective tissue in which the matrix is solid and made of mucoprotein or proteoglycan called chondrin. It is of four types- hyaline, fibrous, calcified and elastic. Yellow, elastic fibrocartilage is found in the pinna and external auditory canals of the ear, Eustachian tubes, epiglottis and the tip of the nose. Its matrix contains numerous yellow fibres which form a network by uniting with one another. Due to the presence of yellow fibres, the cartilage becomes more flexible. Hence, it provides flexibility to these organs.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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