The generation of excitation-contraction coupling involves all the following events except

• generation of end-plate potential

• release of calcium from troponin

• formation of cross-linkages between actin and myosin

• hydrolysis of ATP to ADP

Spindle fibre is made up of

• humulin

• intermediate filament

• flagellin

• tubulin

Osteomalacia is a deficiency disease of

• infants due to protein energy malnutrition

• adults due to protein energy malnutrition

• adults due to vitamin-D deficiency

• infants due to vitamin-K deficiency

Cardiac muscles are

• striated and voluntary

• striated and involuntary

• smooth and voluntary

• smooth and involuntary

All or none law is not applicable for

• whole skeletal muscle

• single skeletal muscle fibre

• whole cardiac muscle

• single smooth muscle fibre

96.

Bone is mainly composed of

• iron and phosphorus

• sulphur and calcium

• calcium and phosphorus

• calcium and magnesium

The H-zone in the skeletal muscle fibre is due to

• the absence of myofibrils in the central portion of A-band

• the central gap between myosin filaments in the A-band

• the central gap between actin filaments extending through myosin filaments in the A-band

• extension of myosin filaments in the central portion of the A-band

Select the correct statement with respect to locomotion in humans

• A decreased level of progesterone causes osteoporosis in old people

• Accumulation of uric acid crystals in joints causes their inflammation

• The vertebral column has 10 thoracic vertebrae

• The joint between adjacent vertebrae is a fibrous joint

The characteristics and an example of a synovial joint in humans is

• Characteristics	Examples
  Fluid cartilage between two bones, limited movements	Knee joints

• Fluid filled between two joints, provides cushion

  Skull bones

• Fluid filled synovial cavity between two bones

  Joint between atlas and axis

• Lymph filled between two bones, limited movement

  Gliding joint between carpals

The disease that occurs in mature adult human being due to deficiency of calciferol is

• keratomalacia

• osteomalacia

• glossitis

• pernicious anaemia