Multiple Choice QuestionsAll or none law is not applicable for
whole skeletal muscle
single skeletal muscle fibre
whole cardiac muscle
single smooth muscle fibre
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
B.
osteomalacia
Calciferol is vitamin-D responsible for enhancing intestinal absorption of calcium, iron, magnesium, phosphate and zinc. It is obtained from diet or from sun exposure. Its deficiency may cause osteomalacia in adults, in which bones of a person becomes soft, weak and fragile. Osteomalacia in children is known as rickets.
Keratomalacia is an eye disorder that results from Vitamin A deficiency.
Glossitis is the inflammation of the tongue.
Pernicious anemia refers to anemia that results from lack of intrinsic factor. It is common due to an autoimmune attack on the cells that create it in the stomach.
Which of the following is not involved in muscular contraction?
Calcium ion
Troponin
Actin
Magnesium ion
What type of cartilaginous tissue is found in the inter-vertebral discs?
Costal cartilage
Hyaline cartilage
White fibrous cartilage
Yellow elastic cartilage
Osteoid refers to
the smallest bone of the body
young hyaline matrix of true bone in which calcium salts are deposited
membranous ossification of cranium
the largest bone of the body
Read the following statements.
Statement I. The flat bones of skull are spongy without marrow cavity.
Statement II. Specialised Bones of skull in mammals are called diploic bones.
Identify wheather the given statements are true or false and choose the correct option.
| Statement I | Statement II |
| True | False |
| False | True |
| True | True |
| False | False |
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