Question 6 (1 point) A muscle has just been stimulated by a neurotransmitter. It

Question

Question 6 (1 point) A muscle has just been stimulated by a neurotransmitter. It is likely this muscle would be in the SELECT ONE STATEMENT Latent period answer not listed stress period refractory period relaxation period Question 7 (1 poind During vigorous workouts, many people complain of 'feeling the burn" Although the burn is primary due to high K levels around muscles, many people once belleved that pyruvic acid is broken down into lactic acid whe n insufficient is available during exercise and this 8

Explanation / Answer

Ans. Muscle contraction involves three successive steps- latent period, contraction period and relaxation period.

Latent period is the FIRST stage trigger by stimulation by a neurotransmitter. It is characterized by the time span between acceptance of stimulation by muscle to the beginning of onset of contraction. The contraction period is the duration of muscle contraction. The last phase, relaxation period, is the time during which a muscle returns from contraction to resting phase.

If a muscle has just been stimulated (muscle fibre has contract), it can’t contract again immediately. The next muscle contraction is only after certain time gap. The minimum time duration of inability to contract between two successive contractions is called refractory period.    

# So, if a muscle has just been stimulated by a neurotransmitter, it is likely that this muscle would be in Latent period, refractory period or relaxation period. The exact stage would depend when you take the measurements.

So, correct options are- A. Latent period, D. Refractory period, E. Relaxation period.

# Note: the term “stress period” is not used in muscle activity in general.

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