Cardiac muscles can be best defined as:

1.	Many cardiac muscle cells assemble in a branching pattern.
2.	Single cardiac muscle fibre enclosed by connective tissue layer.
3.	Group of multinucleated muscle fibres enclosed by connective tissue layer.
4.	Group of unstriated muscle fibres enclosed by endocardium.

Which of the following is required for the breaking of cross-bridge during muscle contraction?

1. ATP and Ca⁺⁺

2.  ADP and Ca⁺⁺

3.  Only Ca⁺⁺

4.  ATP only

Identify the incorrectly matched pair:

Consider the characters of a particular type of joint:

What is this type of joint called?

1. Hinge

2. Ball and socket

3. Pivot

4. Saddle

The depression on the coxa where the head of the femur articulates is the
1. acetabulum.
2. auricular surface.
3. iliac fossa.
4. ischial tuberosity.

An acromion process is characteristically found in the -

1. Skull of frog

2. Sperm of mammals

3.  Pelvic girdle of mammals

4. Pectoral girdle of mammals

Stimulation of a muscle fiber by a motor neuron occurs at:

1. the neuromuscular junction

2. the transverse tubules

3. the myofibril

4. the sarcoplasmic reticulum

What part of the scapula bone shown in the figure articulates with the head of the humerus?

1. A

2. B

3. C

4. D

What masks the active sites for myosin head present on the actin myofilaments?
1. Light meromyosin
2. Heavy meromyosin
3. G – actin
4. Troponin

Arthritis is