The globular head of myosin contains
Calcium ions in large quantities
Troponin
ATPase enzyme
ATP
C.
ATPase enzyme
Globular head of myosin contains an ATPase enzyme that along with CO2+ and Mg2+ ions catalyses the breakdown of ATP during muscle contraction. It also has a binding site for ATP and active sites for actin.
Match the items of column I with column II and choose the correct option from the codes given below.
| Column I | Column II |
| A. Neuron | 1. Ossein |
| B. Bone-matrix | 2. Nissl’s bodies |
| C. RBCs of man | 3. Antibodies |
| D. Lymphocytes | 4. Non-nucleated |
| A | B | C | D |
| 4 | 1 | 2 | 3 |
| A | B | C | D |
| 2 | 1 | 4 | 3 |
| A | B | C | D |
| 3 | 4 | 1 | 2 |
| A | B | C | D |
| 2 | 3 | 4 | 1 |
Select the correct combination of statements regarding Myasthenia gravis.
I, III, IV,V
I, III,V II
I, II, IV, V
II, III, IV, V
Change in the number of body parts is called
Continuous variation
Discontinuous variation
Meristic variation
Substantive variation
Dense regular connective tissue is present in
ligament and tendons
Joint capsule and Wharton's jelly
Periosteum and endosteum
Pericardium and heart valves
Yellow bone marrow is found specially in the medullary cavity
Long bones
Spongy bones
Short bones
All of the above
Achondroplasia is a disease related with the defect in the formation of
membrane
mucosa
bone
cartilage
What will happen if ligaments are torn?
Bone will become unfixed
Bone will become fixed
Bone less movable at joint and pain
Bone will move freely at joint and no pain
Sliding filament theory can be best explained as
When myofilaments slide pass each other actin filaments shorten while myosin filament does not shorten
Actin-myosin filaments shorten and slide pass each other
Actin and myosin filaments do not shorten, but rather slide pass each other
When myofilament slide passes each other myosin filament shorten while actin filament do not shorten.
