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451.

Assertion: Triceps is said to be an extensor muscle for elbow joint. Reason: Triceps relaxes durings extension of forearm at the elbow joint.A. If both the assertion and the reason are true and reason is a correct explanation of the assertionB. If both the assertioin and reason are true but the reason is not a correct explanation of the assertion.C. If the assertion is true but the reason is falseD. If both the assertion and reason are false

Answer» Correct Answer - C
Movements are produced at joints by contraction of skeletal muscles inserted into articulating bones. The contraction of an extensor muscle extends a joint. Hence causing extension of the limb. Contraction of triceps brings about the extension of foream at the elbow joint hence it is said to be the extensor muscle for elbow joint.
452.

lnnommate isA. A nerve B. AnuteryC. Avein D. A part of skeleton and an artery

Answer» Correct Answer - D
Innominate is part of skeleton and an artery.
453.

Assertion: Locomotion in Hydra is carried out by two types of contractile cells. Reason: Muscle fibres are lacking in Hydra.A. If both the assertion and the reason are true and reason is a correct explanation of the assertionB. If both the assertioin and reason are true but the reason is not a correct explanation of the assertion.C. If the assertion is true but the reason is falseD. If both the assertion and reason are false

Answer» Correct Answer - A
As muscle fibres are lacking in Hydra, the animal uses two types of contractile cells for this purpose. Processes of these cells run in the body wall both along the long axis of the body and arround the central body cavity. Contraction and releaxation of these cells respectively. shorten and elongate these processes. They consequently cause all types of movement of Hydra including shortening, elongation and also bending of body and tentacular movement Locomotion is carried out by somersaults looping.
454.

Muscle fibres having rounded ends areA. Unstriped musclesB. Smoothe musclesC. Striated musclesD. All the above

Answer» Correct Answer - A
455.

Transmitter substance released at the synapse isA. SecretinB. CholecystokininC. CholesterolD. Acetylcholin

Answer» Correct Answer - D
456.

Which is part of pectoral girdle ?A. IleumB. Glenoid cavityC. AcetabulumD. Sternum

Answer» Correct Answer - B
457.

The first cervical vertebra is A. Axis B. Atlas C. Lumbar D. Sacral

Answer» Correct Answer - B
The first cervial vertebra is atlas second is axis.
458.

Cervical vertebra is differentiated from other vertebra byA. presence of odontoidB. presence of transverse processC. Amphiplatyan centrumD. presence of vertebrarterial canal

Answer» Correct Answer - D
459.

In mammals the number of cervical vertebra is A. 7B. 9C. 1D. 12

Answer» Correct Answer - A
In mammals the number of cervical vertebra are 7.
460.

A feature of the vertebra of mammals isA. Centrum is amphiplatyanB. Epiphysis is presentC. Inter vertebral disc present between two bonesD. All the above

Answer» Correct Answer - D
461.

A typical vertebra of rabbit isA. AcoelousB. ProcoelousC. AmphicoelousD. Amphiplatyan

Answer» Correct Answer - D
462.

Acromian process is present inA. Pectoral girdle of frogB. Pectoral girdle of rabbitC. Pelvic girdle of rabbitD. Pelvic girdle of frog

Answer» Correct Answer - B
463.

Shoulder joint present between `:-`A. Glenoid cavity of pectoral girdle and head of humerusB. Coracoid process of pectoral girdle and head of humerusC. BothD. None

Answer» Correct Answer - A
464.

Name the different stimuli that cause excition of muscle fibre .

Answer» Nerve impulse , hormones , mechanical , thermal and chemical stimulus .
465.

What is epimysium ?

Answer» The whole muscle is covered by a sheath of connective tissue called epimysiurm .
466.

Which two struures the skeleton ?

Answer» Bone and cartilage .
467.

Name the three proteins present on the thin myo-filament

Answer» Actin , tropmyosin , troponin
468.

What is skeletal system ?

Answer» Skeletal system is a system of external and internal living or dead, hardened structure which forms the supportive protective and jointed framework of the body .
469.

which element is required for conversion of G-actin into F-actin ?

Answer» Correct Answer - Magnesium
470.

Bones become fragile due toA. Arthritis B. Osteoporosis C. GoutD. None of these

Answer» Correct Answer - B
Bones become fragile due to osteoporosis
471.

What does sarcomere comprises of ?

Answer» A sarcomere comprises of a single A - bond and half of each adjacent I- band .
472.

Name the oxygen - binding protein in the muscle ?

Answer» Correct Answer - Myoglobin .
473.

Describe HMM.

Answer» The globualar head along with the short arms is called hevy meromyosin or HMM.
474.

Label A,B,C and D in the given diagram.

Answer» Correct Answer - A-fascicle
B-muscle fibre
C-sarcolemma
D-blood capillary
475.

Yellow bone marrow occurs in medullary cavity ofA. Short bonesB. Sponsgy bonesC. Long BonesD. All of the above

Answer» Correct Answer - C
Yellow bone marrow occurs in medullary cavity of long bones.
476.

Name the two important parts of meromyosin

Answer» Correct Answer - Globular head with a short arm and a tail.
477.

The heavy meromyosin (HMM) component, i.e the head and short arm projects outwards at regular distance and angle from each other from the surface of a polymerised myosin filament and is known as A. Neuromuscular JunctionB. Motor unit C. Cross bridgeD. Cross arm

Answer» Correct Answer - D
The heavy meromyosin (HMM) component, i.e, the head and short arm projects outwords at regular distance and the angle from each other from the surface of a polymerised myosin filament and is known as cross arm.
478.

Globular head of myosin containsA. Ca ions in large quantitiesB. TroponinC. ATPase enzymeD. ATP.

Answer» Correct Answer - C
479.

The given figure is related with myosin monomer (meromyosis). Identify the parts labelled from A to C and select the correct option . A. `{:("(A)",(B),(C),),("(Head)",("Cross arm"),("GTP binding sites"),):}`B. `{:("(A)",(B),(C),),("(Cross arm)",("Head"),(Ca^(+2)"binding sites"),):}`C. `{:("(A)",(B),(C),),("(Head)",("Cross arm"),("ATP binding sites"),):}`D. `{:("(A)",(B),(C),),("(Cross)",("Head"),("ATP binding sites"),):}`

Answer» Correct Answer - C
480.

The given figure is associated with myosin monomer (meromyosin). Identify A to C A. A-cross arm, B- head, C-ATP binding sitesB. A-head, B-cross arm, C-ATP binding sitesC. A-head, B-cross arm, C=`Ca^(+2)` binding sitesD. A-head, B-cross arm, C-GTP binding sites

Answer» Correct Answer - B
481.

Joint between femur and tibio-fibula isA. Hinge jointB. Saddle jointC. Pivot jointD. Imperfect joint

Answer» Correct Answer - A
482.

Assertion : Maximum movement is possible at the amphiarthrosis joint. Reason : Such joint are also called synovial joints and have almost frictionless movement due to synovial fluid.A. If both Assertion and Reason are ture and the Reason is the correct explanation of the Assertion.B. If both Assertion and Reason are ture, but the Reason is not the correct explanation of the Assertion.C. If Asserion is ture, but Reason is false .D. If both Assertion and Reason are false.

Answer» Correct Answer - D
483.

Muscle band that remains unchanged during contraction and relaxation of skeletal muscle is A. IB. HC. AD. Z-line

Answer» Correct Answer - C
Muscle band that remains unchanged during contraction and relaxation of skeletal muscle is A.
484.

The movable skull bone isA. MaxillaB. VomerC. MandibleD. All of the above

Answer» Correct Answer - C
The movable skull bone is mandible.
485.

Which bone is keystone of the cranial floor ?A. ParietalB. OccipitalC. SphenoidD. Frontal

Answer» Correct Answer - C
486.

Which is the only movable skull bone other than auditory ossicles ?A. MaxillaeB. MandibleC. inferior nasal conchaseD. Zygomatic

Answer» Correct Answer - B
487.

Comparative study of skulls isA. CraniologyB. ConchologyC. MalacologyD. Osteology

Answer» Correct Answer - A
488.

Pivot joint isA. Atlanto-axial jointB. Shoulder jointC. Hip jointD. None

Answer» Correct Answer - A
489.

Part of the body having a single pair of bones isA. Pelvic girdleB. External earC. WristD. Lower jaw

Answer» Correct Answer - A
490.

The vetebrae which bears the whole weight of the skull isA. AxisB. SacralC. CervicalD. Atlas

Answer» Correct Answer - D
According to Greek mythology, their one God Atlas supports the earth. It the skull can be considered as the globe (earth) then first veretebra which bears whole of its weight can be regarded as Arias. It is named on this basis only.
491.

The study of joints is known asA. OsteologyB. ArthrologyC. CraniologyD. Kinesiology

Answer» Correct Answer - B
492.

Part of the body having a single pair of bones isA. Pelvic girdleB. External earC. WristD. Lower jaw.

Answer» Correct Answer - A
Pelvic girdle is made of two innominates.
493.

A vertebra having flat surface both in front and behind isA. AcoelousB. ProcoelousC. AmphicoelousD. Amphiplatyon

Answer» Correct Answer - D
494.

A vertebra having convexity both in front and behind isA. AcoelousB. ProcoelusC. AmphicoelousD. Amphiplatyon.

Answer» Correct Answer - A
Actually acoelous means without a concavity on either of its ends. It can be amphiplatyon with both the ends flat, or amphidicondylar with both the ends convex. Other types of vertebrae (= centra) are procoelous (anterior concavity), opisthocoelous (posterior concavity), amphicoelous (both sides concave) and heterocoelous (saddle shaped or concavoconvex).
495.

Special fibrous joint occuring exclusively in skull which is the tightest type of joint isA. SuspensoriumB. Suspensory ligamentC. SutureD. Occipital

Answer» Correct Answer - C
The skull bones fit together by sutures.
496.

A vertebra has a convexity both in front and behind it. It is calledA. ProcoelousB. AmphicoelousC. AcoelousD. Amphiplatyon

Answer» Correct Answer - C
Acoelous mens without cavity on either of its ends. It can be amphiplatyon with both ends flats or amphidicondylar with both ends convex. Procoelous have anterior concavity, amphicoelos has both sides concave.
497.

What is correct about human bodyA. There are 5 vertebra in the neckB. Brain box is made up of 4 bonesC. There are 15 pairs of ribsD. There are 12 thoracic vertebra

Answer» Correct Answer - D
Thoracic vertebrae are 12 in number, present in the chest.
498.

Bone related to skull isA. AtlasB. CaracoidC. ArtenoidD. Pterygoid

Answer» Correct Answer - D
Pterygoid is short rod shaped bone forming the posterior roof of mouth cavity.
499.

Number of bones in human body isA. 206B. 205C. 306D. 305 .

Answer» Correct Answer - A
500.

Number of bones in human body isA. 206 B. 205 C. 306 D. 305

Answer» Correct Answer - A
Number of bones in human body are 206.