Assertion` :-` On repeated application of stimuli, involuntary stripled muscles undergo fatigue.
Reason `:` This is due to non availability of ATP molecules.

Assertion :- On repeated application of stimuli, involuntary striped muscles undergo fatigue. Reason : This is due to non availability of ATP molecules.

Assertion : Cardiac muscles contract rapidly like striated muscles but do not undergo fatigue. Reason : Cardiac muscles contract rhythmically.

Assertion : Non-myelinated nerve fibres do not possess nodes of Ranvier. Reason : This is due to the absence of nissl's bodies in node of Ranvier.

These questions consist of two statement each, printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses. A. If both Assertion and Reason are true and Reason is a correct explanation of the Assertion. B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion. C. If Assertion is true but Reason is false. D. If both Assertion and Reason are false. Assertion: Cardoac muscle contract rapdily like striated muscles but do not undergo fatigue. Reason. Cardiac muscles contract rhythmically

Assertion : Pigeons and kites can fly for long period without undergoing fatigue. Reason : These birds have white muscle fibres which undergo slow and sustained contraction for long period.

Assertion : Muscle contraction force increases with rise in strength of stimulus. Reason: This is due to increased contraction of individual muscle fibres with increases in stimulus strength.

Assertion: Some cells enter G_(0) phase leading to inactivation of cell cycle. Reason: G_(0) phase occurs due to non-availability of mitogen and energy rich compounds.