Consider the following statements:

I. A motor neuron along with the muscle fibres connected to it constitute a motor unit

II. The neurotransmitter released at the neuro-muscular junction is Acetylcholine.

III. Myosin head has ATPase activity.

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

Consider the following statements:

I. Myasthenia gravis is an autoimmune disorder affecting the neuromuscular junction

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

III. Tetany is rapid spasms in muscles 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

Consider the following statements:

I. Proximal radioulnar joint is a type of ellipsoidal joint.

II. The first carpo-metacarpal joint is a saddle joint.

III. Gleno-humeral joint is a ball and socket joint.

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 chose your answer from the codes given below:

Codes:

             I           II         III 

1.          1           2           3

2.          3           1           2

3.          2           1           3

4.          1           3           2

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

Codes

            I           II         III         IV

1.         1           2           3           4

2.         2           1           4           3

3.         2           1           3           4

4.         1           2           4           3

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

Codes :

Which of the following joints would allow no movement?

(1) Fibrous joint

(2) Cartilaginous joint

(3) Synovial joint

(4) Ball and socket joint

Out of 'X' pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation.

(1) X = 12, Y = 7           True ribs are attached, dorsally to 

                                      vertebral column and ventrally to

                                      the sternum.

(2) X = 12, Y = 5           True ribs are attached dorsally to

                                      vertebral column and sternum on

                                      the two ends.

(3) X = 24, Y = 7           True ribs are dorsally attached to

                                      vertebral column, but are free on

                                      ventral side.

(4) X = 24, Y = 12         True ribs are dorsally attached to 

                                      vertebral column, but are free on 

                                      ventral side.

The pivot joint between atlas and axis is a type of

(1) fibrous joint                 

(2) cartilaginous joint

(3) synovial joint               

(4) saddle joint

Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.

(1)  Calcium              

(2)  Magnesium

(3)  Sodium              

(4)  Potassium.