Select the correct option.

1.	There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.
2.	8th, 9th and 10th pairs of ribs articulate directly with the sternum.
3.	11th and 12th pairs of ribs are connected to the sternum with the help of hyaline cartilage.
4.	Each rib is a flat thin bone and all the ribs are connected dorsally to the thoracic vertebrae and ventrally to the sternum.

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:

The number of which of the following would normally be equal in human skeleton?
1. Vertebrochondral ribs and digits in both upper limbs
2. Bones in cranium and the facial skeleton
3. Carpals and tarsals
4. Vertebrosternal ribs and digits in one lower limb

Which of the following muscular disorders is inherited?

1. Botulism

2. Tetany

3. Muscular dystrophy

4. Myasthenia gravis

Which one of the following is the correct matching of three items and their grouping category?

Elbow joint is an example of:

1. Pivot joint

2. Hinge joint

3. Glinding joint

4. ball and socket joint

The length of which of the following regions shown in the given diagram of a sarcomere remains unchanged during muscle contraction?

1. 1

2. 2

3. 7

4. 6

Low Ca²⁺ in the body fluid may be the cause of:

1. tetany

2. anaemia

3. angina pectoris

4. gout

Select the correct statement with respect to locomotion in humans: