Select Question Set:
Q. No.Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.
(1) Calcium
(2) Magnesium
(3) Sodium
(4) Potassium.
Subtopic: Sliding Filament Theory |
94%
From NCERT
NEET - 2016
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The pivot joint between atlas and axis is a type of:
1. Cartilaginous joint
2. Synovial joint
3. Saddle joint
4. Fibrous joint
Subtopic: Synovial Joint |
78%
From NCERT
NEET - 2017
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Which of the following hormones can play a significant role in osteoporosis?
| 1. | Aldosterone and Prolactin |
| 2. | Progesterone and Aldosterone |
| 3. | Estrogen and Parathyroid hormone |
| 4. | Parathyroid hormone and Prolactin |
Subtopic: Disorders of Muscular and Skeletal System |
89%
From NCERT
NEET - 2018
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Osteoporosis, an age-related disease of skeletal system, may occur due to:
| 1. | junction leading to fatigue |
| 2. | high concentration of ca++ and Na+ |
| 3. | decreased level of oestrogen |
| 4. | accumulation of uric acid leading to inflammation of joints |
Subtopic: Disorders of Muscular and Skeletal System |
91%
From NCERT
NEET - 2016
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Calcium is important in skeletal muscle contraction because it:
| 1. | binds to troponin to remove the masking of active sites on actin for myosin. |
| 2. | activates the myosin ATPase by binding to it. |
| 3. | detaches the myosin head from the actin filament. |
| 4. | prevents the formation of bonds between the myosin cross bridges and the actin filament. |
Subtopic: Excitation Contraction Coupling I | Sliding Filament Theory | Muscle Contraction: Other Considerations |
86%
From NCERT
NEET - 2018
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Out of ‘X’ pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation:
| 1. | X=12, Y=5 True ribs are attached to vertebral column and sternum on the two ends. |
| 2. | X=24, Y=7 True ribs are dorsally attached to vertebral column but are free on ventral side. |
| 3. | X=24, Y=12 True ribs are dorsally attached to vertebral column but are free on ventral side. |
| 4. | X=12, Y=7 True ribs are attached dorsally to vertebral column and ventrally to the sternum. |
Subtopic: Sternum & Ribs |
87%
From NCERT
NEET - 2017
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Lack of relaxation between successive stimuli in sustained muscle contraction is known as?
1. fatigue
2. tetanus
3. tonus
4. spasm
2. tetanus
3. tonus
4. spasm
Subtopic: Disorders of Muscular and Skeletal System |
53%
From NCERT
NEET - 2016
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Which of the following joints would allow no movement?
1. Fibrous joint
2. Cartilaginous joint
3. Synovial joint
4. Ball and socket joint
Subtopic: Fibrous & Catilaginous Joints |
88%
From NCERT
NEET - 2015
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Which of the following is not a function of the skeletal system?
1. Production of erythrocytes
2. Storage of minerals
3. Production of body heat
4. Locomotion
Subtopic: Human Skeleton: Introduction, Function, Parts |
71%
From NCERT
NEET - 2015
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Sliding filament theory can be best explained as:
| 1. | when myofilaments slide past each other, actin filaments shorten while myosin filament does not shorten |
| 2. | actin and myosin filaments shorten and slide past each other |
| 3. | actin and myosin filaments do not shorten but rather slide pass each other |
| 4. | when myofilaments slide past each other, myosin filaments shorten while actin filaments do not shorten |
Subtopic: Sliding Filament Theory |
52%
From NCERT
NEET - 2015
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