Ca+2 bind ________ in the skeletal muscles and leads to exposure of the binding site for ________ on the filament _______:
(1) Troponin, myosin, actin
(2) Troponin, actin, relaxin
(3) Actin, myosin, troponin
(4) Tropomysin, myosin, actin
Following is the figure of actin (thin) filaments. Identify A, B and C:
1. A - Tropomyosin, B - Troponin, C - F-actin
2. A - Troponin, B - Myosin, C - Tropomyosin
3. A - Troponin, B - Tropomyosin, C - Myosin
4. A - Troponin, B - Tropomyosin, C - F-actin
The above figure is related with myosin monomer (meromyosin). Identify A to C:
(1) A - head, B - cross arm, C - GTP binding sites
(2) A - head, B - cross arm, C - Ca+2 binding sites
(3) A - head, B - cross arm, C - ATP binding sites
(4) A - cross arm, B - head, C - ATP binding sites
Put the following phrases in proper order to describe what occurs at the neuromuscular junction to trigger muscle contraction:
I. | Receptor sites on sarcolemma. |
II. | Nerve impulse. |
III. | Release of Ca+2 from sarcoplasmic reticulum |
IV. | The neurotransmitter acetylcholine is released |
V. | Sarcomere shorten |
VI. | Synaptic cleft |
VII. | Spread of impulses over sarcolemma on T-tubules |
1. II, IV, I, VI, VII, III, V
2. II, IV, VI, I, VII, III, V
3. I, II, III, IV, V, VI, VII
4. VII, VI, V, IV, III, II, I
How many bones make up the human skeleton?
(1) 948
(2) 96
(3) 796
(4) 206
Number of bones in human axial skeleton is:
(1) 80
(2) 106
(3) 206
(4) None of these
Human skull is:
(1) Dicondylic
(2) Monocondylic
(3) Procoelous
(4) Hetercoelous
The figure is of rib cage. Identify A, B and C respectively:
(1) Coccyx, ribs, vertebral column
(2) Sternum, ribs, vertebral column
(3) Scapula, ribs, vertebral column
(4) Tarsal, ribs, vertebral column
Number of bone in each upper limb is:
(1) 1, 1, 1
(2) 8, 5, 14
(3) 2, 2, 2, 16, 10, 28
(4) 1, 1, 1, 8, 5, 14
Joint between bones in the form of sutures of human skull is a:
1. | Hinge joint | 2. | Synovial joint |
3. | Cartilaginous joint | 4. | Fibrous joint |