LOCOMOTION AND MOVEMENT

Which of the following cells exhibit amoeboid movement?

• (a) Macrophages

• (b) Leucocytes

• (c) RBC

• (d) Both (a) and (b)

Which muscle is not under direct control of nervous system?

• (a) Skeletal (Striated muscles)

• (b) Smooth (Non-striated muscles)

• (c) Cardiac muscles

• (d) All of these

Identify A, B, C and D in the given figure.

• (a) A–Sarcolemma, B–Blood capillary, C–Fascicle (muscle bundle), D–Muscle fibre (muscle cell)

• (b) A–Blood capillary, B–Muscle fibre (muscle cell), C–Fascicle (muscle bundle), D–Sarcolemma

• (c) A–Sacrolemma, B–Muscle fibre (muscle cell), C–Fesicle (muscle bundle), D–Blood capillary

• (d) A–Muscle fibre (muscle cell), B–Sarcolemma, C–Blood capillary, D–Fascicle (muscle bundles)

Sarcoplasmic reticulum is a storehouse of which ion

• (a) Ca2+

• (b) Na+

• (c) K+

• (d) Fe2+

Following is the figure of actin (thin) filaments. Identify A, B and C.

• (a) A−Tropomyosin, B−Troponin, C−F actin

• (b) A−Tropomyosin, B−Myosin, C−F Tropomyosin

• (c) A−Troponin, B−Tropomyosin, C−Myosin

• (d) A−Troponin, B−Tropomyosin, C−F actin

Identify A to D in the figure.

• (a) A–Actin binding sites, B–Head, C–Cross arm, D–ATP binding sites

• (b) A–Cross arm, B–Actin binding sites, C–ATP binding sites, D–Head

• (c) A–ATP binding sites, B–Head, C–Actin binding sites, D–Cross arm

• (d) A–Head, B–Cross arm, C–ATP binding sites, D–Actin binding sites

ATP provides energy for muscle contraction by allowing for

• (a) An action potential formation in the muscle cell.

• (b) Cross-bridge detachment of myosin from actin.

• (c) Cross-bridge attachment of myosin to actin.

• (d) Release of Ca2+ from sarcoplasmic reticulum.

Go through the following diagram describing muscle contraction. Identify A to E.

• (a) A−Sliding/Rotation, B−Actin filament, C−Myosin head, D−ATP

• (b) A–Myosin head, B–Sliding/Rotation, C–ATP, D–Actin filament

• (c) A−Sliding/Rotation, B−Myosin head, C−Actin filament, D−ATP

• (d) A−Actin filament, B−Sliding/Rotation, C−ATP, D−Myosin head

A motor unit is best described as

• (a) All the nerve fibres and muscle fibres in a single muscle bundle.

• (b) One muscle fibre and its single nerve fibre.

• (c) A single motor neuron and all the muscle fibres that it innervates.

• (d) As the neuron which carries the message from muscles to CNS.

The diagrams given above depicts three different condition of sarcomeres. Identify these

conditions:

• (a) A–contracting, B–relaxed, C–maximally contracted

• (b) A–relaxed, B–contracting, C–maximally contracted

• (c) A–maximally contracted, B–relaxed, C–contracting

• (d) A–relaxed, B–maximally contracted, C–contracting