Chapter 20

Assertion: Red fibres are referred as aerobic muscles Reason: These muscles contain large number of mitochondria which utilize the large amount of oxygen stored in them for ATP production.

Assertion: Bone have very hard matrix Reason: Matrix of bone contain calcium salt in it

Assertion: In parathyroid tetany rapid spasm of muscle occurs. Reason: It is due to low calcium ion in body fluid.

Assertion: Myasthenia gravis is autoimmune disorder. Reason: It results due to antibodies are formed that block our own nicotinic acetylcholine receptor at neuromuscular junction.