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WorksheetsLocomotion and Movement- Quiz 3
Total questions: 10
Worksheet time: 4mins
Z-line divides the myofibrils into –
Sarcomere
Sarcolemma
Sarcosome
Microtubules
The region between the ends of the A-bands of 2-adjoining sarcomeres is called –
The Z-band
The H-zone
The T-tubule
The I-band
Choose the letter from the figure that most appropriately corresponds to the structure –
I. A-band II. I-band III. Sarcomere IV. H-zone V. Myosin VI. Actin, Troponin, Tropomyosin VII. Z - line
I - E, II - D, III - F, IV - A, V - B, VI - C, VII - G
I - E, II - D, III - C, IV - G, V - B, VI - A, VII - F
I - E, II - D, III - F, IV - G, V - C, VI - A, VII - B
I - E, II - D, III - F, IV - G, V - B, VI - C, VII - A
An individual sarcomere consist of –
A stack of actin fibres
A stack of myosin units
Overlapping actin and myosin
Overlapping myosin and membrane
The action potential that triggers a muscle contraction travels deep within the muscle cell by means of –
Sarcoplasmic reticulum
Transverse tubules
Synapse
Motor end plates
A motor unit is best described as –
All the nerve fibres and muscle fibres in a single muscle bundle
One muscle fibre and its single nerve fibre
A single motor neuron and all the muscle fibres that it innervates
It is the neuron which carries the messsage from muscle to CNS
According to the sliding filament theory –
Actin (thin filament) moves past myosin (thick filament)
Myosin moves past actin
Both myosin and actin move past each other
None of these is correct
Relaxation of muscle is due to –
Pumping of Ca+2 into sarcoplasmic cisternae
Presence of ATP
Confirmational change in troponin and masking of actin filaments
a and c
When a skeletal muscle shortens during contraction which of these statements is false?
The I-band shortens
The A-band shortens
The H-zone becomes narrow
The sarcomeres shorten
The diagrams given above show 3 different condition of sarcomeres. Identify these conditions –
A - contracting, B - relaxed, C - maximally contracted
A - relaxed, B - contracting, C - maximally contracted
A - maximally contracted, B - contracting, C - relaxed
A - relaxed, B - maximally contracted, C - contracting
