1. | Aldosterone and Prolactin |
2. | Progesterone and Aldosterone |
3. | Estrogen and Parathyroid hormone |
4. | Parathyroid hormone and Prolactin |
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. |
The pivot joint between atlas and axis is a type of:
1. Cartilaginous joint
2. Synovial joint
3. Saddle joint
4. Fibrous joint
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. |
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.
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 |