out of x pairs of ribs in humans only y pairs are true ribs

Out of $$'X'$$ pairs of ribs in humans only $$'Y'$$ pairs are true ribs. Select the option that correctly represents values of $$X$$ and $$Y$$ and provides their explanation:

A. $$X = 12, Y = 5$$ True ribs are attached dorsally to vertebral column and sternum on the two ends

B. $$X = 24, Y = 7$$ True ribs are dorsally attached to vertebral column but are free on ventral side

C. $$X = 24, Y = 12$$ True ribs are dorsally attached to vertebral column but are free on ventral side

D. $$X = 12, Y = 7$$ True ribs are attached dorsally to vertebral column and ventrally to the sternum

Answer : $$X = 12, Y = 7$$ True ribs are attached dorsally to vertebral column and ventrally to the sternum

Releted MCQ Question on
Zoology >> Locomotion and Movement

Releted Question 1

Calcium is important in skeletal muscle contraction because it

A. Binds to troponin to remove the masking of active sites on actin for myosin

B. Activates the myosin ATPase by binding to it

C. Prevents the formation of bonds between the myosin cross bridges and the actin filament

D. Detaches the myosin head from the actin filament

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Releted Question 2

Lack of relaxation between successive stimuli in sustained muscle contraction is known as

A. Spasm

B. Fatigue

C. Tetanus

D. Tonus

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Releted Question 3

Sliding filament theory can be best explained as:

A. Actin and Myosin filaments shorten and slide pass each other

B. Actin and Myosin filaments do not shorten but rather slide pass each other

C. When myofilaments slide pass each other, Myosin filaments shorten while Actin filaments do not shorten

D. When myofilaments slide pass each other Actin filaments shorten while Myosin filament do not shorten

View Answer

Releted Question 4

The $$H$$-zone in the skeletal muscle fibre is due to:

A. The central gap between myosin filaments in the $$A$$-band

B. The central gap between actin filaments extending through myosin filaments in the $$A$$-band

C. Extension of myosin filaments in the central portion of the $$A$$-band

D. The absence of myofibrils in the central portion of $$A$$-band

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Out of $$'X'$$ pairs of ribs in humans only $$'Y'$$ pairs are true ribs. Select the option that correctly represents values of $$X$$ and $$Y$$ and provides their explanation:

Releted MCQ Question on
Zoology >> Locomotion and Movement

Calcium is important in skeletal muscle contraction because it

Lack of relaxation between successive stimuli in sustained muscle contraction is known as

Sliding filament theory can be best explained as:

The $$H$$-zone in the skeletal muscle fibre is due to:

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Locomotion and Movement

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Out of $$'X'$$ pairs of ribs in humans only $$'Y'$$ pairs are true ribs. Select the option that correctly represents values of $$X$$ and $$Y$$ and provides their explanation:

Releted MCQ Question on Zoology >> Locomotion and Movement

Calcium is important in skeletal muscle contraction because it

Lack of relaxation between successive stimuli in sustained muscle contraction is known as

Sliding filament theory can be best explained as:

The $$H$$-zone in the skeletal muscle fibre is due to:

Practice More Releted MCQ Question on Locomotion and Movement

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Releted MCQ Question on
Zoology >> Locomotion and Movement

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Locomotion and Movement