Calcium is important in skeletal muscle contraction because it
1. Detaches the myosin head from the actin filament
2. Activates the myosin ATPase by binding to it
3. Binds to troponin to remove the masking of active sites on actin for myosin
4. Prevents the formation of bonds between the myosin cross bridges and the actin filament

Subtopic:  Excitation Contraction Coupling I | Muscle Contraction: Other Considerations |
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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 |
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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 | Muscle Contraction: Other Considerations |
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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 = 7           True ribs are attached, dorsally to 

                                      vertebral column and ventrally to

                                      the sternum.

(2) X = 12, Y = 5           True ribs are attached dorsally to

                                      vertebral column and sternum on

                                      the two ends.

(3) X = 24, Y = 7           True ribs are dorsally attached to

                                      vertebral column, but are free on

                                      ventral side.

(4) X = 24, Y = 12         True ribs are dorsally attached to 

                                      vertebral column, but are free on 

                                      ventral side.

 

Subtopic:  Sternum & Ribs |
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The pivot joint between atlas and axis is a type of

(1) fibrous joint                 

(2) cartilaginous joint

(3) synovial joint               

(4) saddle joint

Subtopic:  Synovial Joint |
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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 |
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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 dorsdally 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 |
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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 |
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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:  Muscle Contraction: Other Considerations |
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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 |
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