Cross bridge formation during muscle contraction involves:

1.	troponin and actin	2.	tropomyosin and myosin
3.	myosin and troponin	4.	myosin and actin

For the muscular movements to be coordinated, it is important that:
1. the muscle twitches must be of increasing strength.
2. muscle is divided into motor units
3. type I fibers must be more than type II fibers in a muscle
4. the muscle twitches undergo tetanization.

Calcium, vital for muscle contraction, is stored in:
1. transverse tubules
2. myosin head
3. myofibrils
4. sarcoplasmic reticulum

Identify the correct statement regarding the use of ATP in muscle contraction:
1. ATP cannot be directly used for muscle contraction.
2. ATP is not required for muscle relaxation.
3. When ATP is hydrolyzed, the conformation of myosin is changed.
4. Once the cross-bridge is formed, the hydrolysis of ATP initiates the power stroke.

Classification of joints is done on the basis of:

Given these types of joints:

a. gomphosis
b. suture
c. symphysis
d. synchondrosis
e. syndesmosis

Choose the types that are held together by fibrous connective tissue.

1. a, b, c

2. a, b, e

3. b, c, e

4. c, d, e
 

Identify the incorrectly matched pair:

What type of joints are intervertebral discs?
1. sutures.
2. syndesmoses.
3. symphyses.
4. synovial joints.

The primary cartilaginous joints and the secondary cartilaginous joints are respectively called:

1. sutures; synchondroses

2. syndesmoses; symphyses

3. symphyses; syndesmoses

4. synchondroses; symphyses

A space between the bones of the skull in an infant or fetus, where ossification is not complete and the sutures not fully formed is called a:

1. synchondrosis.

2. syndesmosis.

3. symphysis.

4. fontanel.