238280
Which statement is correct for muscle contraction?
1 Length of H-zone is decreased
2 Length of A-band remains constant
3 Length of I-band gets increased
4 Length of two Z-line get increased
Explanation:
During muscles contraction length of A-bond remains constant Muscles contraction initiate when utilizing the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross-bridge. This pulls the attached actin filaments towards the center of ' \(A\) ' band. The ' \(Z\) ' line attached to these actin are also pulled inward thereby causing a shortening of the sarcomere, i.e. contraction. - It is clear the above step, that during shortening of muscles i.e. contraction. The 'I' band get reduced and A band retain the length.
238283
The generation of excitation-contraction coupling involves all the following events except
1 generation of end- plate potential
2 release of calcium from troponin
3 formation of cross-linkages between actin and myosin
4 hydrolysis of ATP to ADP
Explanation:
Sarcoplasmic reticulum is a specialized form of the endoplasmic reticulum which stores ca++ ions. - Calcium ions are released from the sarcoplasmic reticulum during contraction. These \(\mathrm{Ca}^{+}\)ions bind with the tropanin to initiate contraction. So \(\mathrm{Ca}^{+}\)excitation contraction coupling.
WB JEE-2009
Locomotion and Movement
238285
The thin filaments of a muscle fibre are made up of :
1 actin, troponin, tropomyosin
2 actin, troponin
3 myosin, troponin
4 actin, tropomyosin
Explanation:
Exp. A Thin filaments are polymer of actin with tightly bound regulatory proteins troponin and tropomyosin when the cytoplasmic \(\mathrm{Ca}^{2+\mathrm{s}}\) concentration inhibit the actin- activated adenosine triphosphatase (ATP) of myosin. Tropomyosin and a gigantic filamentous protein, nebulin, stabilize thin filamentous laterally.
AP EAMCET - 2015 / Haryana PMT-2005 JIPMER-2005
Locomotion and Movement
238287
In human, muscular coordination is controlled by
1 bone marrow
2 medula oblongata
3 cerebellum
4 cerebrum
Explanation:
In Human muscular coordination is controlled by cerebellum. Cerebellum controlled balance for walking and standing and other complex function. It is the second largest part of Brain. - The bone marrow is essential part of body where the RBC formed. - Medulla oblongata is responsible for involuntary functions such as breathing and heart rate. - Cerebrum is the largest part of the brain.
CG PMT-2006
Locomotion and Movement
238290
The region between two successive Z-lines in a myofibril is
1 Sarcomere
2 Sarcosome
3 Fascia
4 Anisotropic band
5 Isotropic band
Explanation:
Exp. A The region between two successive Z-lines in a myofibril is called a sarcomere. Sarcomere is basic structural units of striated muscle fibers and responsible for muscle contraction. They are composed of overlapping actin and myosin filaments. Which give rise to the alternating dark and light bands observed in striated muscle. The Z-lines mark the boundaries of a sarcomere and provide anchorage for the actin filaments during muscle contraction.
238280
Which statement is correct for muscle contraction?
1 Length of H-zone is decreased
2 Length of A-band remains constant
3 Length of I-band gets increased
4 Length of two Z-line get increased
Explanation:
During muscles contraction length of A-bond remains constant Muscles contraction initiate when utilizing the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross-bridge. This pulls the attached actin filaments towards the center of ' \(A\) ' band. The ' \(Z\) ' line attached to these actin are also pulled inward thereby causing a shortening of the sarcomere, i.e. contraction. - It is clear the above step, that during shortening of muscles i.e. contraction. The 'I' band get reduced and A band retain the length.
238283
The generation of excitation-contraction coupling involves all the following events except
1 generation of end- plate potential
2 release of calcium from troponin
3 formation of cross-linkages between actin and myosin
4 hydrolysis of ATP to ADP
Explanation:
Sarcoplasmic reticulum is a specialized form of the endoplasmic reticulum which stores ca++ ions. - Calcium ions are released from the sarcoplasmic reticulum during contraction. These \(\mathrm{Ca}^{+}\)ions bind with the tropanin to initiate contraction. So \(\mathrm{Ca}^{+}\)excitation contraction coupling.
WB JEE-2009
Locomotion and Movement
238285
The thin filaments of a muscle fibre are made up of :
1 actin, troponin, tropomyosin
2 actin, troponin
3 myosin, troponin
4 actin, tropomyosin
Explanation:
Exp. A Thin filaments are polymer of actin with tightly bound regulatory proteins troponin and tropomyosin when the cytoplasmic \(\mathrm{Ca}^{2+\mathrm{s}}\) concentration inhibit the actin- activated adenosine triphosphatase (ATP) of myosin. Tropomyosin and a gigantic filamentous protein, nebulin, stabilize thin filamentous laterally.
AP EAMCET - 2015 / Haryana PMT-2005 JIPMER-2005
Locomotion and Movement
238287
In human, muscular coordination is controlled by
1 bone marrow
2 medula oblongata
3 cerebellum
4 cerebrum
Explanation:
In Human muscular coordination is controlled by cerebellum. Cerebellum controlled balance for walking and standing and other complex function. It is the second largest part of Brain. - The bone marrow is essential part of body where the RBC formed. - Medulla oblongata is responsible for involuntary functions such as breathing and heart rate. - Cerebrum is the largest part of the brain.
CG PMT-2006
Locomotion and Movement
238290
The region between two successive Z-lines in a myofibril is
1 Sarcomere
2 Sarcosome
3 Fascia
4 Anisotropic band
5 Isotropic band
Explanation:
Exp. A The region between two successive Z-lines in a myofibril is called a sarcomere. Sarcomere is basic structural units of striated muscle fibers and responsible for muscle contraction. They are composed of overlapping actin and myosin filaments. Which give rise to the alternating dark and light bands observed in striated muscle. The Z-lines mark the boundaries of a sarcomere and provide anchorage for the actin filaments during muscle contraction.
NEET Test Series from KOTA - 10 Papers In MS WORD
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Locomotion and Movement
238280
Which statement is correct for muscle contraction?
1 Length of H-zone is decreased
2 Length of A-band remains constant
3 Length of I-band gets increased
4 Length of two Z-line get increased
Explanation:
During muscles contraction length of A-bond remains constant Muscles contraction initiate when utilizing the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross-bridge. This pulls the attached actin filaments towards the center of ' \(A\) ' band. The ' \(Z\) ' line attached to these actin are also pulled inward thereby causing a shortening of the sarcomere, i.e. contraction. - It is clear the above step, that during shortening of muscles i.e. contraction. The 'I' band get reduced and A band retain the length.
238283
The generation of excitation-contraction coupling involves all the following events except
1 generation of end- plate potential
2 release of calcium from troponin
3 formation of cross-linkages between actin and myosin
4 hydrolysis of ATP to ADP
Explanation:
Sarcoplasmic reticulum is a specialized form of the endoplasmic reticulum which stores ca++ ions. - Calcium ions are released from the sarcoplasmic reticulum during contraction. These \(\mathrm{Ca}^{+}\)ions bind with the tropanin to initiate contraction. So \(\mathrm{Ca}^{+}\)excitation contraction coupling.
WB JEE-2009
Locomotion and Movement
238285
The thin filaments of a muscle fibre are made up of :
1 actin, troponin, tropomyosin
2 actin, troponin
3 myosin, troponin
4 actin, tropomyosin
Explanation:
Exp. A Thin filaments are polymer of actin with tightly bound regulatory proteins troponin and tropomyosin when the cytoplasmic \(\mathrm{Ca}^{2+\mathrm{s}}\) concentration inhibit the actin- activated adenosine triphosphatase (ATP) of myosin. Tropomyosin and a gigantic filamentous protein, nebulin, stabilize thin filamentous laterally.
AP EAMCET - 2015 / Haryana PMT-2005 JIPMER-2005
Locomotion and Movement
238287
In human, muscular coordination is controlled by
1 bone marrow
2 medula oblongata
3 cerebellum
4 cerebrum
Explanation:
In Human muscular coordination is controlled by cerebellum. Cerebellum controlled balance for walking and standing and other complex function. It is the second largest part of Brain. - The bone marrow is essential part of body where the RBC formed. - Medulla oblongata is responsible for involuntary functions such as breathing and heart rate. - Cerebrum is the largest part of the brain.
CG PMT-2006
Locomotion and Movement
238290
The region between two successive Z-lines in a myofibril is
1 Sarcomere
2 Sarcosome
3 Fascia
4 Anisotropic band
5 Isotropic band
Explanation:
Exp. A The region between two successive Z-lines in a myofibril is called a sarcomere. Sarcomere is basic structural units of striated muscle fibers and responsible for muscle contraction. They are composed of overlapping actin and myosin filaments. Which give rise to the alternating dark and light bands observed in striated muscle. The Z-lines mark the boundaries of a sarcomere and provide anchorage for the actin filaments during muscle contraction.
238280
Which statement is correct for muscle contraction?
1 Length of H-zone is decreased
2 Length of A-band remains constant
3 Length of I-band gets increased
4 Length of two Z-line get increased
Explanation:
During muscles contraction length of A-bond remains constant Muscles contraction initiate when utilizing the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross-bridge. This pulls the attached actin filaments towards the center of ' \(A\) ' band. The ' \(Z\) ' line attached to these actin are also pulled inward thereby causing a shortening of the sarcomere, i.e. contraction. - It is clear the above step, that during shortening of muscles i.e. contraction. The 'I' band get reduced and A band retain the length.
238283
The generation of excitation-contraction coupling involves all the following events except
1 generation of end- plate potential
2 release of calcium from troponin
3 formation of cross-linkages between actin and myosin
4 hydrolysis of ATP to ADP
Explanation:
Sarcoplasmic reticulum is a specialized form of the endoplasmic reticulum which stores ca++ ions. - Calcium ions are released from the sarcoplasmic reticulum during contraction. These \(\mathrm{Ca}^{+}\)ions bind with the tropanin to initiate contraction. So \(\mathrm{Ca}^{+}\)excitation contraction coupling.
WB JEE-2009
Locomotion and Movement
238285
The thin filaments of a muscle fibre are made up of :
1 actin, troponin, tropomyosin
2 actin, troponin
3 myosin, troponin
4 actin, tropomyosin
Explanation:
Exp. A Thin filaments are polymer of actin with tightly bound regulatory proteins troponin and tropomyosin when the cytoplasmic \(\mathrm{Ca}^{2+\mathrm{s}}\) concentration inhibit the actin- activated adenosine triphosphatase (ATP) of myosin. Tropomyosin and a gigantic filamentous protein, nebulin, stabilize thin filamentous laterally.
AP EAMCET - 2015 / Haryana PMT-2005 JIPMER-2005
Locomotion and Movement
238287
In human, muscular coordination is controlled by
1 bone marrow
2 medula oblongata
3 cerebellum
4 cerebrum
Explanation:
In Human muscular coordination is controlled by cerebellum. Cerebellum controlled balance for walking and standing and other complex function. It is the second largest part of Brain. - The bone marrow is essential part of body where the RBC formed. - Medulla oblongata is responsible for involuntary functions such as breathing and heart rate. - Cerebrum is the largest part of the brain.
CG PMT-2006
Locomotion and Movement
238290
The region between two successive Z-lines in a myofibril is
1 Sarcomere
2 Sarcosome
3 Fascia
4 Anisotropic band
5 Isotropic band
Explanation:
Exp. A The region between two successive Z-lines in a myofibril is called a sarcomere. Sarcomere is basic structural units of striated muscle fibers and responsible for muscle contraction. They are composed of overlapping actin and myosin filaments. Which give rise to the alternating dark and light bands observed in striated muscle. The Z-lines mark the boundaries of a sarcomere and provide anchorage for the actin filaments during muscle contraction.
238280
Which statement is correct for muscle contraction?
1 Length of H-zone is decreased
2 Length of A-band remains constant
3 Length of I-band gets increased
4 Length of two Z-line get increased
Explanation:
During muscles contraction length of A-bond remains constant Muscles contraction initiate when utilizing the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross-bridge. This pulls the attached actin filaments towards the center of ' \(A\) ' band. The ' \(Z\) ' line attached to these actin are also pulled inward thereby causing a shortening of the sarcomere, i.e. contraction. - It is clear the above step, that during shortening of muscles i.e. contraction. The 'I' band get reduced and A band retain the length.
238283
The generation of excitation-contraction coupling involves all the following events except
1 generation of end- plate potential
2 release of calcium from troponin
3 formation of cross-linkages between actin and myosin
4 hydrolysis of ATP to ADP
Explanation:
Sarcoplasmic reticulum is a specialized form of the endoplasmic reticulum which stores ca++ ions. - Calcium ions are released from the sarcoplasmic reticulum during contraction. These \(\mathrm{Ca}^{+}\)ions bind with the tropanin to initiate contraction. So \(\mathrm{Ca}^{+}\)excitation contraction coupling.
WB JEE-2009
Locomotion and Movement
238285
The thin filaments of a muscle fibre are made up of :
1 actin, troponin, tropomyosin
2 actin, troponin
3 myosin, troponin
4 actin, tropomyosin
Explanation:
Exp. A Thin filaments are polymer of actin with tightly bound regulatory proteins troponin and tropomyosin when the cytoplasmic \(\mathrm{Ca}^{2+\mathrm{s}}\) concentration inhibit the actin- activated adenosine triphosphatase (ATP) of myosin. Tropomyosin and a gigantic filamentous protein, nebulin, stabilize thin filamentous laterally.
AP EAMCET - 2015 / Haryana PMT-2005 JIPMER-2005
Locomotion and Movement
238287
In human, muscular coordination is controlled by
1 bone marrow
2 medula oblongata
3 cerebellum
4 cerebrum
Explanation:
In Human muscular coordination is controlled by cerebellum. Cerebellum controlled balance for walking and standing and other complex function. It is the second largest part of Brain. - The bone marrow is essential part of body where the RBC formed. - Medulla oblongata is responsible for involuntary functions such as breathing and heart rate. - Cerebrum is the largest part of the brain.
CG PMT-2006
Locomotion and Movement
238290
The region between two successive Z-lines in a myofibril is
1 Sarcomere
2 Sarcosome
3 Fascia
4 Anisotropic band
5 Isotropic band
Explanation:
Exp. A The region between two successive Z-lines in a myofibril is called a sarcomere. Sarcomere is basic structural units of striated muscle fibers and responsible for muscle contraction. They are composed of overlapping actin and myosin filaments. Which give rise to the alternating dark and light bands observed in striated muscle. The Z-lines mark the boundaries of a sarcomere and provide anchorage for the actin filaments during muscle contraction.