Assertion Reason Test: Locomotion & Movement - NEET MCQ

A: All muscles follow the 'All or None' principle.

R: All muscles contract either fully or not contract at all depending upon threshold stimulus availability.

A: Tibia is stronger than fibula and is present medially whereas fibula is lateral to the tibia and slender bone of lower leg or shank.

R: Tibia has a sharp crest in the shaft, and a projection on the inner side of the ankle called lateral malleolus.

A: In case of gout Inflammation of a skeletal joint may immobilize the movements of the joint.

R: Uric acid crystals in the joint cavity and ossification of articular cartilage leading to this.

A: Sella tursica is located in the skull which lodges the pituitary gland.

R: It is depression present in the sphenoid bone.

A: Muscle tetanus is the phenomenon of sustained muscle contraction due to succession of nerve impulse/stimuli being received by it.

R: Many of our daily activities are due to tetanic contraction of muscles like holding the book.

A: Application of stimuli repeatedly just at the start of relaxation of a muscle fibre shows an increase in the extent of contraction initially and results in treppe or staircase phenomenon.

R: It can be attributed to the summation effect of the subthreshold stimuli being given again and again.

A: Latent period is the interval between the application of an appropriate stimulus and the initiation of contraction.

R: Latent period is minimum in cardiac muscle fibres.