Locomotion and Movement- Quiz 2

Light bands (thin filaments) contain actin and are called –

• A-bands or Isotropic band

• A-bands or Anisotropic bands

• I-bands or Isotropic bands

• I-bands or Anisotropic bands

Which of the following statements about the striated muscles is false?

I. In the centre of each I-band is an elastic fibre (Z-line) which bisects it

II. Thin filaments are firmly attached to the Z-line

III. M-line is a fibrous membrane in the middle of A-bands

IV. A sarcomere comprises one full A-bands and 2 half I-bands

• All

• IV

• I and II

• None

One myosin filament in the myofibril of skeletal muscle fibres is surrounded by how many actin filaments –

• 8

• 2

• 6

• 4

The cross bridges of the sacromere in skeletal muscle are made up of –

• Actin

• Myosin

• Troponin

• Myelin

Tropomysin is moved by which of following proteins –

• Calmodulin

• Actin

• Troponin

• Acetylcholine

The energy for muscle contraction is most directly obtained from -

• Phosphocreatine

• ATP

• Anaerobic respiration

• Aerobic respiration

Which of the following does not belong with the others?

• multinucleated

• skeletal

• striated

• involuntary

Each muscle fiber is directly surrounded by connective tissue called the _____.

• perimysium

• fascia

• endomysium

• epimysium

Sarcolemma is found over

• heart

• nerve fibre

• bone

• skeletal muscle fibre

Cyclosis a characteristic of plant cell. this movement is due to

• Sliding microtubule

• Cytoplasmic streaming

• Beating of cilia

• Podia formation