Immediately after an action potential has peaked, which cellular gates open?

1. Sodium
2. Chloride
3. Calcium
4. Potassium

The useful purpose served by lactate fermentation is:
1. Make lactose available for gluconeogenesis
2. Production of additional ATP in anaerobic conditions
3. Regeneration of NAD+
4. Increased availability of oxygen for the skeletal muscle

Scapula is a large triangular flat bone situated in the dorsal part of the thorax between:

1. the second and fifth ribs

2. the second and seventh ribs

3. the third and sixth ribs

4. the third and eighth ribs

Consider the following statements:

I. Myasthenia gravis is an autoimmune disorder affecting neuromuscular junction

II. Muscular dystrophy is a progressive degeneration of skeletal muscles mostly due to genetic disorder

III. Tetany is rapid spasms in muscle due to high Ca"" in body fluid.

Which of the above statements are true?

1. I and II only

2. I and III only

3. II and III only

4. I, II and III

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

Codes :

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