Muscle Structure and Function
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Questions and Answers

What is the plasma membrane lining each muscle fibre called?

Sarcolemma

What is the alternate light and dark band pattern in myofibrils due to?

Presence of protein actin and myosin

What elastic fiber is found in the center of each I-band?

Z line

What is the functional unit of muscle contraction called?

<p>Sarcomere</p> Signup and view all the answers

What is the part of thick filament not overlapped by thin filament called?

<p>H zone</p> Signup and view all the answers

What is the role of Acetylcholine in muscle contraction?

<p>Acetylcholine is the neurotransmitter released by neural signals to generate action potential in the sarcolemma.</p> Signup and view all the answers

How do Ca++ ions contribute to muscle contraction?

<p>Ca++ ions released from the sarcoplasmic reticulum activate actin, leading to the formation of cross bridges with myosin.</p> Signup and view all the answers

What distinguishes red muscle fibers from white muscle fibers?

<p>Red fibers contain myoglobin and more mitochondria, while white fibers have fewer myoglobin and mitochondria.</p> Signup and view all the answers

Describe the composition of the axial skeleton.

<p>The axial skeleton includes the skull, vertebral column, sternum, and ribs.</p> Signup and view all the answers

How many bones are present in the human appendicular skeleton?

<p>The human appendicular skeleton consists of bones in the limbs and girdles, totaling 126 bones.</p> Signup and view all the answers

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