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 |
 88%
From NCERT
NEET - 2018
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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 |
 85%
From NCERT
NEET - 2018
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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 |
 77%
From NCERT
NEET - 2017
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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 |
 86%
From NCERT
NEET - 2017
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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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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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Lack of relaxation between successive stimuli in sustained muscle contraction is known as?
1. fatigue
2. tetanus
3. tonus
4. spasm
Subtopic:  Disorders of Muscular and Skeletal System |
 56%
From NCERT
NEET - 2016
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