Biology Fsc Part 1 Chapter 12 Online Test With Answers

Biology Fsc Part 1 Chapter 12 Online Test

Sr. # Questions Answers Choice
1 Red marrow is found in Ends of long bones Ribs Pelvis and sternum All of above
2 The concentric layers of lamellae surround a central canal are called. Medullary canal Haversian canal Lacunae Periosteum
3 The concentric layers of mineralized extra cellular matrix that contains collagen fibres and needle shaped crystals of calcium phosphate is  Lacunae Lamellae Haversian canal Canaliculi
4 the basic structurl uits of compact bone are called. Neural canal Haversian canal Haversian system Lacuna
5 the thick layer unde the periosteum made up of hard material, osteocytes, collagen is called. spongy bone Compact bone Callus all of above
6 The middle part of long boen along the length is called. Diaphysis Shaft Epiphysis Both a and b
7 The broad ends of a bone are called Epiphysis Diaphysis Paaphysis Metaphysis
8 What is true abotu antagonistic pair of muscles . It provides a backup if one of the muscles is injured One muscle pushes whle other pulls It allows muscles to produce opposing movements It doubles the strength of contraction 
9 Tendons connect bone and Muscle Bone Ligaments Cartilage
10 Which statement cotraction.rrectly describes an event of muscle con Myosin heads bind to troponin ATP binds to the actin binding site ATP is used to detech the myosin head from actin Troponin blocks the binding sites
11 When a muscle fibre shortens, which of the following also shortens. Actin filament Sarcomere Myosin filament Z-line
12 Which statement is correct to describe sliding filament model of muscle contraction Mosin filaments pull on the sarcomere so that actin filaments are shortened Myosin filaments pull on actin filaments so that sarcomere is shortened Actin filaments pull on myosin filaments so that sarcomere is shortned Actin filaments pull on sarcomere so that myosin filaments are shortened.
13 Which part of muscle fibre releases calcium ions which trigger, contraction. Sarcolemma Sarcoplasm Sarcoplasmic reticulum T-tubules
14 Sarcomer is a part between Two Z-lines Two H-lines Two A-bands Two - I-bands
15 In a muscle, the Z-line are th roteins for the attachemnt of the ends of. Actin filaments Myosin filaments Both actin and myosin filaments Sarcomeres
16 Actin filaments are made of proteins. Actin, tropomyosin and troponin Myosin andiroponin Acin and myosin Myosin and troponin
17 Which of these extends the entire length of a muscle fibre. Myofibril Sarcomere Myosin filament Actin filament
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