Locomotion and Movement · Biology · NEET

Which of the following represents the correct sequence of arrangement of bones in the lower limb of humans?

The number of vertebrae in a human is $\_\_\_\_$ .

Muscle contraction is initiated by a signal sent by the central nervous system by the release of $\_\_\_\_$ .

Which of the following is the correct order of arrangement of vertebrate column from the head to toe?

Choose the correct statements regarding muscle contraction.

A. A motor neuron carries a signal sent by the Central Nervous System (CNS) to the sarcolemma of the muscle fibre.

B. The neural signal generates an action potential which causes the release of $\mathrm{Ca}^{++}$into sarcoplasm.

C. Increase in $\mathrm{Ca}^{++}$inactivates the actin for breaking cross bridges.

D. Actin binds to the myosin head to form a cross bridge.

E. Shortening of sarcomere takes place, by pulling actin filaments towards the centre of ' A ' band.

Choose the correct answer from the options given below :

Which of the following statements are correct with reference to human endoskeleton?

A. Human skull is monocondylic.

B. The joint between any two adjoining vertebrae is a cartilaginous joint.

C. In human beings, the number of cervical vertebrae is seven.

D. All ribs except the last 2 pairs are bicephalic.

E. The occipital bone of skull is articulated with atlas vertebra.

Choose the correct answer from the options given below:

$$ \text { Match List I with List II related to muscular/skeletal system: } $$

Match List-I with List-II:

Chose the correct answer from the options given below:

Select the correct statements regarding mechanism of muscle contraction.

A. It is initiated by a signal sent by CNS via sensory neuron.

B. Neurotransmitter generates action potential in the sarcolemma.

C. Increased Ca$$^{++}$$ level leads to the binding of calcium with troponin on action filaments.

D. Masking of active site for actin is activated.

E. Utilising the energy from ATP hydrolysis to form cross bridge.

Choose the most appropriate answer from the options given below:

Three types of muscles are given as a, b and c. Identify the correct matching pair along with their location in human body:

Name of muscle/location

Match List I with List II :

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Match List-I with List-II.

Choose the correct answer from the options given below :

Match List I with List II.

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Which of the following statements are correct regarding skeletal muscle?

A. Muscle bundles are held together by collagenous connective tissue layer called fascicle.

B. Sarcoplasmic reticulum of muscle fibre is a store house of calcium ions.

C. Striated appearance of skeletal muscle fibre is due to distribution pattern of actin and myosin proteins.

D. M line is considered as functional unit of contraction called sarcomere.

Choose the most appropriate answer from the options given below:

Choose the correct statement about a muscular tissue

According to the sliding filament theory:

Gout is a type of disorder which leads to:

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Osteoporosis is characterised by decreased bone mass and increased chance of fractures.

Reason (R) : Common cause of osteoporosis is increased levels of estrogen.

In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following is a correct match for disease and its symptoms?