(A) The correct answer is $A$. The functional unit of muscle contraction is known as the $sarcomere$. It is defined as the portion of a myofibril that

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Portion of myofibril between two successive $Z$-lines

(A) The correct answer is $A$. The functional unit of muscle contraction is known as the $sarcomere$. It is defined as the portion of a myofibril that lies between two successive $Z$-lines. During muscle contraction,these $sarcomeres$ shorten as the actin and myosin filaments slide past each other.

Class 11 Biology Locomotion and Movement Muscles

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The functional unit of contraction is a

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A
Portion of myofibril between two successive $Z$-lines
B
Portion of myofibril between two successive $M$-lines
C
Centre of the $H$-zone
D
Centre of the $I$-band

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Locomotion and Movement

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Assertion: Fatigue is the inability of a muscle to relax.
Reason: It is due to lactic acid accumulation by repeated contractions.

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Rotation of the thigh on the lateral side is facilitated by:

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What are $P, Q,$ and $R$ in the given diagram?
$P \quad\quad Q \quad \quad R$

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Which muscle band remains unchanged during the contraction and relaxation of the skeletal muscle?

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Which of the following muscles act involuntarily?
$(a)$ Striated muscles $(b)$ Smooth muscles
$(c)$ Cardiac muscles $(d)$ Skeletal muscles

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The functional unit of contraction is a

Similar Questions

Assertion: Fatigue is the inability of a muscle to relax.Reason: It is due to lactic acid accumulation by repeated contractions.

Rotation of the thigh on the lateral side is facilitated by:

What are $P, Q,$ and $R$ in the given diagram?$P \quad\quad Q \quad \quad R$

Which muscle band remains unchanged during the contraction and relaxation of the skeletal muscle?

Which of the following muscles act involuntarily?$(a)$ Striated muscles $(b)$ Smooth muscles$(c)$ Cardiac muscles $(d)$ Skeletal muscles

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Assertion: Fatigue is the inability of a muscle to relax.
Reason: It is due to lactic acid accumulation by repeated contractions.

What are $P, Q,$ and $R$ in the given diagram?
$P \quad\quad Q \quad \quad R$

Which of the following muscles act involuntarily?
$(a)$ Striated muscles $(b)$ Smooth muscles
$(c)$ Cardiac muscles $(d)$ Skeletal muscles