Which of the following is not involved in muscular contraction?

• Calcium ion

• Troponin

• Actin

• Magnesium ion

What type of cartilaginous tissue is found in the inter-vertebral discs?

• Costal cartilage

• Hyaline cartilage

• White fibrous cartilage

• Yellow elastic cartilage

Osteoid refers to

• the smallest bone of the body

• young hyaline matrix of true bone in which calcium salts are deposited

• membranous ossification of cranium

• the largest bone of the body

Read the following statements.

Statement I. The flat bones of skull are spongy without marrow cavity.

Statement II. Specialised Bones of skull in mammals are called diploic bones.

Identify wheather the given statements are true or false and choose the correct option.

• Statement I	Statement II
  True	False

• False

  True

• True

  True

• False

  False

Choose the correctly paired sets from the following.

Set I	Set II	Set III
I. Sphenoid bone	Key- stone bone	Cranium
II. Acromion process	Collor bone	Scapula
III. Xiphoid process	Breast bone	Thorax
IV. Odontoid process	Atlas	Cervical vertebra

• I, IV

• II, IV

• II, III

• I, III

Microtubules are assembled from molecules of the protein tubulin, which is a

• monomer

• dimer

• trimer

• pentamer

Study the following and identify the incorrect statements.

I. Muscles of the iris end ciliary body are the smooth muscles of mesodermal origin.

II. Slow and sustained involuntary contractions of smooth muscles are called spasms.

III. Quiescent mononucleate myogenic cells of skeletal muscles are called pericytes.

IV. The skeletal muscle fibre is multinucleate and is a synctium.

• I, IV

• II, IV

• III, IV

• I, III

Match the following Columns

Column I	Column II
A.  Pisiform bone	i. Ruminants
B. Fibrous cartilage	ii. Wrist bone
C. Hyaline cartilage	iii. Intervertebral discs
D. OS- cardis	iv. Larynx v. Pinna

The correct answer is

• A - ii; B - iii; C - iv; D - v

• A - v; B - ii; C - i; D - iv

• A - iv; B - iii; C - ii; D - i

• A - v; B - ii; C - iii; D - iv

Thousand of years old mummies are still in their condition as they were before due to some reason. Which of the following describe it the best?

• Due to non-destruction of yellow elastin fibre

• Due to non-destruction of white elastin fibre

• Due to non-destruction of collagen fibre

• Due to non-destruction of veins

Patella (knee cap) is an example of

• replacing bones

• sesamoid bones

• flat bones

• irregular bones