Muscle Function and Behavior

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What is the primary component of thin filaments in muscle cells?

Myosin

Microfilaments

Actin (correct)

Statocysts

What is the result of filament movement in muscle cells?

Muscle contraction (correct)

Passive muscle extension

Nervous system motor output

Cell motility

What is the function of microfilaments in cells?

Sensory mechanisms

Muscle contraction

Cell motility (correct)

Nervous system motor output

What is required for muscle function?

The interaction of protein filaments Signup and view all the answers

What is the arrangement of myosin molecules in thick filaments?

Staggered arrays Signup and view all the answers

What occurs only passively in muscle cells?

Muscle extension Signup and view all the answers

What is the common underlying mechanism of diverse behaviors such as feeding, swimming, and crawling?

Muscle activity in response to nervous system motor output Signup and view all the answers

What is the role of actin in muscle cells?

It is a globular protein that forms thin filaments Signup and view all the answers

What is the outcome of the interaction between thin and thick filaments in muscle cells?

Muscle cell contraction Signup and view all the answers

What is the function of myosin molecules in muscle cells?

They form the thick filaments in muscle cells Signup and view all the answers

What is the energy source that powers muscle contraction?

Chemical energy Signup and view all the answers

What is the focus of examination in understanding muscle contraction?

Skeletal muscle of vertebrates Signup and view all the answers

What is the characteristic feature of skeletal muscle that can be observed with a light microscope?

Light and dark bands (striations) Signup and view all the answers

Which of the following is a single cell in vertebrate skeletal muscle?

A muscle fiber Signup and view all the answers

What is the location of thick filaments in a sarcomere?

At the M line Signup and view all the answers

What is the function of the hierarchy of smaller units in vertebrate skeletal muscle?

To move bones and body Signup and view all the answers

What is the arrangement of filaments in a resting myofibril?

Thin filaments are partially overlapped by thick filaments Signup and view all the answers

What is the name given to skeletal muscle due to its characteristic pattern of light and dark bands?

Striated muscle Signup and view all the answers

What is the characteristic pattern visible with a light microscope in skeletal muscle?

Light and dark bands (striations) Signup and view all the answers

What is the function of sarcomeres in skeletal muscle?

To serve as the basic contractile units of skeletal muscle Signup and view all the answers

Where are thin filaments anchored in a sarcomere?

At the Z lines Signup and view all the answers

What is the arrangement of thick and thin filaments in a resting myofibril?

Thick and thin filaments partially overlap Signup and view all the answers

What is the structure that contains multiple nuclei in a skeletal muscle fiber?

Muscle fiber Signup and view all the answers

What is the term for the repeating sections of myofibrils that are the basic contractile units of skeletal muscle?

Sarcomeres Signup and view all the answers