Biology : Locomotion and Movement

Sliding filament theory can be best explained as

• When myofilaments slide pass each other actin filaments shorten while myosin filament does not shorten

• Actin-myosin filaments shorten and slide pass each other

• Actin and myosin filaments do not shorten, but rather slide pass each other

• When myofilament slide passes each other myosin filament shorten while actin filament do not shorten.

Select the correct combination of statements regarding Myasthenia gravis.

1. It is an auto-immune disorder.
2. It causes insufficient acetylcholine binding that effects muscular contraction.
3. Antibodies are developed against acetylcholine
4. Antibodies are developed against acetylcholine receptors.
5. It causes drooping of eyelids.

• I, III, IV,V

• I, III,V II

• I, II, IV, V

• II, III, IV, V

What will happen if ligaments are torn?

• Bone will become unfixed

• Bone will become fixed

• Bone less movable at joint and pain

• Bone will move freely at joint and no pain

Yellow bone marrow is found specially in the medullary cavity

• Long bones

• Spongy bones

• Short bones

• All of the above

Space in the jaw bone unoccupied by teeth is called

• Dentine

• diastema

• enamel

• crown

Match the items of column I with column II and choose the correct option from the codes given below.

• A	B	C	D
  4	1	2	3

• A	B	C	D
  2	1	4	3

• A	B	C	D
  3	4	1	2

• A	B	C	D
  2	3	4	1

The globular head of myosin contains

• Calcium ions in large quantities

• Troponin

• ATPase enzyme

• ATP

Dense regular connective tissue is present in

• ligament and tendons

• Joint capsule and Wharton's jelly

• Periosteum and endosteum

• Pericardium and heart valves

Achondroplasia is a disease related with the defect in the formation of

• membrane

• mucosa

• bone

• cartilage

Change in the number of body parts is called

• Continuous variation

• Discontinuous variation

• Meristic variation

• Substantive variation