The number of correct statements amongst the given statements is:

I. Cardiac muscles are striated and involuntary.

II. Myosin head is an active ATPase enzyme.

III. The neurotransmitter released at the neuromuscular junction is acetylcholine.

IV. White muscle fibers depend on anaerobic process for energy.

V. Functional unit of muscle contraction is the sarcomere.

  1.  2       

  2.  3

  3.  4       

  4.  5

In the given diagram of the human skull, the bones represented by the letters A, B, and C are respectively:

          1. Sphenoid, Ethmoid and Lacrimal

          2. Ethmoid, Sphenoid and Lacrimal

          3. Sphenoid, Lacrimal and Ethmoid

          4. Ethmoid, Lacrimal and Sphenoid

Match each item in Column I with one in Column II and choose your answer from the codes given below:
       Type of joint            Example
       A. Hinge            a. First carpo-metacarpal
       B. Pivot              b. Between the carpals
       C. Gliding           c. Atlanto-axial
       D. Saddle           d. Knee joint

            A.    B.    C.     D.
   

1.     d     c      b      a
   

2.     c     d      b      a
   

3.     c     b      d      a
   

4.     d     b      a      c

During skeletal muscle contraction, increase in calcium levels leads to binding of calcium to a subunit of _______ on ______ filaments and thereby removes the masking of active sites for ______.

1. Troponin, Tropomysin, Myosin

2. Calmodulin, Actin, Myosin

3. Troponin, Actin, Myosin

4. Calmodulin, Actin, Myosin

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

Zygomatic and sphenoid bone is an example of

1.  Cranial bones.

2.  Cranial bone and facial bone respectively.

3.  Facial bone and cranial bone respectively.

4.  Facial bone.

The calcium binding protein in smooth muscles leading to contraction is:

1.  Calmodulin

2.  Troponin

3.  Tropomyosin

4.  Ubiquitin

Consider the characters of a particular type of joint:
I. It is a type of synovial joint
II. It enables the bone to move in a 360° angle.
III. It is exemplified by joint between humerus and pectoral girdle

What is this type of joint called?

1. Hinge

2. Ball and socket

3. Pivot

4. Saddle

The joint which play a significant role in locomotion:-

1.  Synarthrosis

2.  Synchondrosis

3.  Diarthrosis

4.  Both (1) and (3)