Recent questions tagged ch20

1. Repeated activation of the muscles can lead to the accumulation of pyruvic acid due to anaerobic breakdown of glycogen in them, causing fatigue. 2. Muscle contains a red coloured oxygen storing pigment called myoglobin Regarding 1 and 2 :

asked Apr 3, 2014 by pady_1

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Regarding Pectoral girdle - choose the incorrect answer :

asked Apr 3, 2014 by pady_1

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Regarding Pelvic girdle - choose the incorrect answer :

asked Apr 3, 2014 by pady_1

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Regarding ribs and rib cage - choose the correct answer :

asked Apr 3, 2014 by pady_1

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Regarding vertebral column - choose the correct answer :

asked Apr 3, 2014 by pady_1

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Axial skeleton comprises bones distributed along the main axis of the body. The and ____ constitute axial skeleton.

asked Apr 3, 2014 by pady_1

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1. Myosin and actin are arranged as rod-like structures, parallel to each other and also to the transverse axis of the myofibrils. 2. Actin filaments are thinner as compared to the myosin filaments, hence are commonly called thin and thick filaments respectively. Regarding 1 and 2 :

asked Apr 3, 2014 by pady_1

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Regarding Skeletal system movement -choose the incorrect statement :

asked Apr 3, 2014 by pady_1

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About _ per cent of the body weight of a human adult is contributed by muscles. They have special properties like ________________________ .

asked Apr 3, 2014 by pady_1

1 answer

Muscle is a specialised tissue of origin.

asked Apr 3, 2014 by pady_1

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Regarding Amoeboid movement -choose the incorrect statement :

asked Apr 3, 2014 by pady_1

1 answer

In cartilaginous joints, the bones involved are joined together with _________ . The joint between _ is of this pattern and it ___________ .

asked Apr 3, 2014 by pady_1

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Regarding Fibrous joints - choose the correct answer :

asked Apr 3, 2014 by pady_1

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1. Joints are points of contact between bones, or between bones and cartilages. 2. Force generated by the muscles is used to carry out movement through joints, where the joint acts as a fulcrum. Regarding 1 and 2 :

asked Apr 3, 2014 by pady_1

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Regarding Nature of various types of muscles : Match the following and choose the most appropriate option: (each option on 3 columns can be matched to multiple options on the another 2 columns) eg. A-(iv)-3,5; B-(i); C-(iii)-2; D-(ii),(vi),(vii)-1; (iii),(v)-6;

asked Apr 2, 2014 by pady_1

2 answers

Regarding Types of Synovial joints and their examples : Match the following & choose the most appropriate option:

asked Apr 2, 2014 by pady_1

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Regarding DISORDERS OF MUSCULAR AND SKELETAL SYSTEM : Match the following and choose the most appropriate option: (each option on 3 columns can be matched to multiple options on the another 2 columns) eg. A-(iv)-3,5; B-(i); C-(iii)-2; D-(ii),(vi),(vii)-1; (iii),(v)-6;

asked Apr 2, 2014 by pady_1

1 answer

During contraction : 1. Actin filaments are pulled towards the centre of ‘A’ band. The ‘Z’ line attached to these actins are also pulled inwards thereby causing a shortening of the sarcomere. 2. ‘I’ bands get reduced, whereas the ‘A’ bands retain the length Regarding 1 and 2 : What are A,B and C in order?

asked Mar 26, 2014 by pady_1

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Which of the following is important for muscle contraction and nerve transmission ?

asked Mar 26, 2014 by pady_1

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The HMM component projects outwards at regular distance and angle from each other from the surface of a polymerised myosin filament and is known as _____ (D) . The _ (C) is an active ATPase enzyme and has binding sites for _ (B) and _______ (A).

asked Mar 26, 2014 by pady_1

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Structure of Contractile Proteins (Myosin) : Many monomeric proteins called _ (E) constitute one thick filament. Each (E) has two important parts, a (C) with a and , the former being called the and the latter, the ____ .

asked Mar 26, 2014 by pady_1

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Structure of Contractile Proteins (Actin) : Each actin filament is made of two __ (C) helically wound to each other. Each (C) is a polymer of monomeric . Two filaments of another protein, _ (B) also run close to the (C) throughout its length. In the resting state a subunit of ___ (A) masks the active binding sites for myosin on the actin filaments

asked Mar 26, 2014 by pady_1

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The portion of the muscle fibre between two successive _ (A) is considered as the functional unit of contraction and is called a (E) . In a resting state, the edges of thin filaments on either side of the thick filaments partially overlap the free ends of the thick filaments leaving the central part of the thick filaments. This central part of thick filament, not overlapped by thin filaments is called the (D) .

asked Mar 26, 2014 by pady_1

2 answers

In the centre of each _______ (C) is an elastic fibre called (A) which bisects it. The thin filaments are firmly attached to the _ (A). The thick filaments in the (B) are also held together in the middle of this band by a thin fibrous membrane called _ . The (B) and ___ (C) are arranged alternately throughout the length of the myofibrils.

asked Mar 26, 2014 by pady_1

1 answer

Each myofibril has alternate dark and light bands on it. The light bands contain and is called _ (C), whereas the dark band called (B) contains ___ .

asked Mar 26, 2014 by pady_1

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Each organised skeletal muscle in our body is made of a number of ________ (A) held together by a common collagenous connective tissue layer called _ . Each __ (A) contains a number of _ (B). Each is _ (B) lined by the plasma membrane called __________ (C).

asked Mar 26, 2014 by pady_1

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