The critical event for the contraction of striated muscles would be that calcium ions:

1.	are released from troponin C
2.	bind to tropomyosin
3.	bind to troponin
4.	are taken up by the sarcoplasmic reticulum

All the following shorten during muscle contraction except:
1. sarcomere
2. A bands
3. I bands
4. H bands

Cross bridge formation during muscle contraction involves:

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.