Chitin which makes the exoskeleton in insects is further hardened by:
Correct answer: B. Protein and Calcium Carbonate
- A. Protein and Sodium Bicarbonate
- B. Protein and Calcium Carbonate
- C. Protein and Potassium Carbonate
- D. Protein and Sodium Carbonate
Explanation
Chitin is translucent and tough in its pure form, but it also combines with other materials to form a strong outer structure. For example, in arthropods, it combines with proteins while in crustaceans, it combines with calcium carbonate. This material makes the exoskeleton and shells hard, tough, and stiff.
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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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