Match each item in Column I with one item in Column II and choose your answer from the codes given below:

	Column I		Column II
I.	Influx of sodium	1.	Original establishment of RMP
II.	Efflux of potassium	2.	Repolarization
III.	Na+/K+ pump	3.	Depolarization
IV.	Ca++	4.	Plateau in cardiac muscles

Codes :

	I	II	III	IV
1.	3	2	4	1
2.	2	1	4	3
3.	2	1	3	4
4.	3	2	1	4

What masks the active sites for myosin head present on the actin myofilaments?
1. Light meromyosin
2. Heavy meromyosin
3. G – actin
4. Troponin

A motor unit consists of:
1. A motor neuron and all the muscle fibers innervated by it
2. All the motor neurons innervating one muscle fiber
3. All the muscle fibers in a fasciculus
4. All the muscle fibers in a skeletal muscle

The muscle can directly use which of the following as a source of energy?
1. Creatine phosphate
2. Glucose
3. ATP
4. Fatty acids

With respect to the red muscle fiber, the white muscle fiber has higher:
1. Density of capillary network
2. Number of mitochondria
3. Amount of sarcoplasmic reticulum
4. Glycogen reserve

Myasthenia gravis is an autoimmune disease in which antibodies are formed against:
1. Myelin sheath
2. Articular cartilage
3. Neuro-muscular junctions
4. Thyroid follicle

A glenoid cavity is seen in:
1. Scapula

2. Coxa

3. Humerus

4. Clavicle

In the resting stage, the axonal membrane:
1. is more permeable to sodium than to potassium ions
2. is more permeable to potassium than to sodium ions
3. equally permeable to both sodium and potassium ions
4. impermeable to both sodium and potassium ions

Ribs 11 and 12 are called floating ribs because they
1. do not articulate with the vertebrae
2. attach only indirectly to the sternum
3. have no connection to the sternum
4. do not articulate directly with any other bone

An acromian process is characteristically found in the -

1. Skull of frog

2. Sperm of mammals

3.  Pelvic girdle of mammals

4. Pectoral girdle of mammals