All or none law is not applicable for
whole skeletal muscle
single skeletal muscle fibre
whole cardiac muscle
single smooth muscle fibre
A.
whole skeletal muscle
All or none law or Bowditch's law is a principle which states that response of a muscle nerve to a stimulus is not proportionate to the intensity of stimulus but is either present in full strength or completely absent. This law is applicable to single muscle fibre but entire muscle does not follow this law.
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
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
The disease that occurs in mature adult human being due to deficiency of calciferol is
keratomalacia
osteomalacia
glossitis
pernicious anaemia
Bone is mainly composed of
iron and phosphorus
sulphur and calcium
calcium and phosphorus
calcium and magnesium
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 |
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
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
