What part of the scapula bone shown in the figure articulates with the head of the humerus?

1. A

2. B

3. C

4. D

If production of pyruvic acid by anaerobic metabolism in a muscle is faster than it can be utilized, the surplus is converted to:
1. lactic acid
2. adenosine diphosphate
3. carboxylic acid
4. creatine phosphokinase

Identify the incorrectly matched pair:

Stimulation of a muscle fiber by a motor neuron occurs at:

1. the neuromuscular junction

2. the transverse tubules

3. the myofibril

4. the sarcoplasmic reticulum

An acromion process is characteristically found in the -

1. Skull of frog

2. Sperm of mammals

3.  Pelvic girdle of mammals

4. Pectoral girdle of mammals

In a myosin molecule HMM (heavy meromyosin) is
present in
(i) Globular head (ii) Short arm (iii) Myosin tail

1. (i), (ii), (iii) 

2. (i) only

3. (i), (ii) only 

4. (iii) only

Which one of the following is the correct description of a certain part of a normal human skeleton?

1. First vertebra is axis that articulates with the occipital condyles

2. The 9th and 10th pairs of ribs are called the floating ribs

3. Glenoid cavity is a depression to which the thigh bone articulates 

4. Parietal bone and the temporal bone of the skull are joined by fibrous joint

Select the correct statement regarding the specific disorder of muscular or skeletal system

1. Myasthenia gravis- Autoimmune disorder which inhibits sliding of myosin filaments

2. Gout-inflammation of joints due to extra deposition of calcium

3. Muscular dystrophy-Age related shortening of muscles

4. Osteoporosis-Decrease in bone mass and higher chances of fractures with advancing age

The role of calcium in muscle contraction is

1. to break the cross-bridges as a cofactor in the
hydrolysis of ATP

2. to bind with troponin, changing its shape so that
the actin filament is exposed

3. to transmit the action potential across the
neuromuscular junction

4. to spread the action potential through the T
tubules

Which of the following statements about cross-bridges
is false?

1. They are composed of myosin
2. They bind to ATP after they attach to actin
3. They contain an ATPase
4. They split ATP before they attach to actin