Which of the following occurs during a muscle contraction ? The distance between the z-discs lengthens...

Which of the following occurs during a muscle contraction ?

		The distance between the z-discs lengthens
		The A band shortens
		The I band and the A band switch positions
		thick and thin myofillaments shorten
		The sarcomeres shorten

Jogging, swimming, and aerobics all have this effect on skeletal muscle tissue.

		Decreased # of myofillaments
		Increased # of nuclei per muscle cell
		Increased # of motor units
		None of the above
		Increased # of muscle fibers

In the sliding filament model, ________ stay in place and ________ are pulled toward the center of the
sarcomere.

		Z bands, A bands
		thin filaments, thick filaments
		muscle cells, myofibrils
		fast fibers, slow fibers
		myosin filaments, actin filaments

Solutions

Expert Solution

1)CORRECT ANSWER IS OPTION E - SARCOMERE SHORTEN

Sarcomere are the basic functional unit of muscle.

Sarcomere are mainly composed of Actin filament and myosin filament . They are the main protein that help in teh muscle contraction.

Sarcomere is teh art present between 2 Zline ., it is composed of a myosin filament and 2 half of actin filament.

when the muscle contract the z line will come closer (sarcomere shorten) aand the central H zone ( Region of the A band where the actin filament are absent) will disappear.

A Band is the anisotropic band which contain both the Myosin filament and actin filament

I band or isothropic band is the region where the actin filament only present no myosin filaments.

2) OPTION E - Increased # of muscle fibers

Jogging , swimming running are the example for the aerobic exercise.

In aerobic exercise the glucose in teh muscle are completly oxidised aerobically into energy.

This help in the increase of muscle mass.

,Muscle mass is increase by the hypertrophy of the muscle to the stimuli.

Muscle fibers forming the muscle are increased in the number making the muscle bulker.

3)OPTION E - myosin filaments, actin filaments

Sliding filament theory explain the muscle contraction in the skeletal muscle.

when a motor nerve innervate the the muscle fibre , it releases acetylcholine neurotransmitter into the synapse -------> it bind with the postsynaptic receptor on the muscle membrane -------> depolarises the muscle membrane ------->Calcium ionare released by the sarcoplasmic reticulum ------> it bind with the Troponin c present on the tropomyosin - actin complex------> change in spatial configuration of the tropomyosin result in the exposure of actin binding site -------> Myosin filament bind with the exposed actin binding site ----> Actin filament slide over the myosin filament ----> muscle contract.

Sydney Mullin answered 10 months ago

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