Question

8. The figure below is a diagrammatic representation of a small portion of a relaxed muscle cell (bracket indicates the portion enlarged). (A) In the UPPER figure, LABEL the muscle cell / fiber and a myofibril. Then select different colors for the structures listed below and use them to COLOR the coding circles and corresponding structures on the lower figure. (B) In the LOWER figure, bracket and LABEL an A band, an l band, and a sarcomere. (C) Finally, DRAW a contracted sarcomere in the space beneath the figures and LABEL the same structures as in (B). Thick filaments Thin filaments 090 Oz discs Bizne chat sok ene sin UURILU UN SUS SUS SUS SUS SU

Answer 1

K FILAMENT → MUSCLE BUNDLE SEASCILLE) MUSCLE CELL (MUSCLE FIBRE) Zlone TRIN FILAMENT y myo fibrils > THICK FILAMENT O- THIN FILAMENT → Z LINE FIBRE CAPILLARIES sarcomere Z LINE H-ZONE Z LINE - ACTINCT IN MYOSIN(THIC I BAND ABAND 1 SARCOMERES

(0 MUSCLE CONTRACTING SARCOMERE A BAND Z-LINE TIUS Constitute 배 w I BAND HZONE ULUTTU -- > ACTIN tl → MYOSIN decreased decreased 6 MAXIMALLY CONTRACTED ABAND 2-LINE M thith Noli BANDI NO H ZONE] Z SARCOMERES &

Above images have all the answers.

muscle bundle has many muscle fibres within which myofibrils are arrranged parallaly.myofibril covering is called sarcolemma.myofibril has 2types of fibres actin and myosin which are arranged in an alternating manner.

Sarcomere is the part between 2 Z lines.

Aband contains both myosin and actin filaments.

I band has only actin filaments,which is obliterated during muscle contraction.