Which of the following is important for muscle contraction and nerve impulse transmission?

• Ca²⁺ ions

• Mg²⁺ ions

• Both (a) and (b)

• Fe²⁺ ions

Spindle fibre is made up of

• tubulin

• humulin

• intermediate filament

• flagelin

Action potential is generated by

• Na⁺

• K⁺

• Ca⁺

• Cl^-

Ligament is mainly made up of

• reticulin

• elastin

• myosin

• collagen

175.

Sigmoid notch is formed by

• cavity formed by humerus

• cavity formed by radius-ulna

• cavity formed by tibia-fibula

• cavity formed by femur

An acromian process is characteristically found in the

• pelvic girdle of mammals

• skull of frog

• pectoral girdle of mammals

• sperm of mammals

Which of the following pairs is correctly matched?

• Cartilaginous joint - Skull bones

• Hinge joint - Between vertebrae

• Fibrous joint - Between phalanges

• Gliding joint - Between zygapophyses of the successive vertebrae

The thin filaments of a muscle fibre are made up of

• actin, troponin, tropomyosin

• actin, troponin

• myosin, troponin

• actin, tropomyosin

Which of the following is a transparent tissue

• Tendon

• Hyaline cartilage

• Fibrous cartilage

• All of these

Total number of bones in the hind limb of a man is

• 21

• 23

• 27

• 30