List of top Zoology Questions on Disorders Of Muscular And Skeletal System asked in TS EAMCET

Study the following and choose the correct statements.
• Sarcoplasmic reticulum is the store house of calcium ions.
• Thin filament of a myofibril is formed by actin, troponin and myosin molecules.
• Thick filaments of myofibril are held together by M-line.
• The portion of myofibril between two successive M-lines is called sarcomere.

Study the following and choose the correct statements:
• During muscle contraction, whenever action potential reaches the sarcoplasmic reticulum, \(Ca^{++}\) ions are released into the sarcoplasm.
• Accumulation of lactic acid in sarcoplasm leads to muscle fatigue.
• Ethmoid is considered as the keystone bone of the cranium.
• Sacrum is formed by the fusion of four sacral vertebrae.

These are the floating ribs in human rib cage

This bone forms the posterior part and most of the base of the human cranium

This bone of skull is modified into incus in the middle ear