Muscle Movement Practice

Hydrostatic skeletons are normally used for movement by all of the following animals EXCEPT

Which of the following Types of Skeletons must be shed typically for an animal to grow?

Which of the following is an important function of The Vertebrate Skeleton?

Which type of muscle typically surrounds hollow tubes and organs like the stomach?

A scientist looking through a microscope at a piece of shoulder muscle would see which of the following features?

Striations and branched fibers

Striations and unbranched fibers

Nonstriated tissue with branched fibers

Nonstriated tissues with unbranched fibers

Skeletal muscles are

striated, voluntary, and have branched fibers.

Striated, involuntary, and have branched fibers

Nonstriated, voluntary, and have unbranched fibers

Nonstriated, involuntary, and have branched fibers.

Striated, voluntary, and have unbranched fibers

Cross-bridges form between _____ and _____ during muscular contraction.

Release of cross-bridges depends most directly on

Adenine triphosphate

Adenine diphosphate

Calcium ions

Potassium ions

In muscle function at the sarcomere level, the binding of ___ ions to ____ regulates the formation of cross-bridges.

What is the role of calcium in muscle contractions?

To break the cross-bridges as a cofactor in the hydrolysis of ATP

to spread the action potential through the T-tubules

To re-establish the polarization of the plasma's membrane following an action potential

To bind with troponin, changing its shape so that binding sites on the actin filament are exposed

To transmit the action potential across the neuromuscular junction

Smooth muscle and cardiac muscle cells differ from skeletal muscle because they

Do not contain thin filaments

Have one nucleus per fiber

Are striated

Do not contain thick filaments

The smallest functional unit of skeletal muscle is the:

Sarcoplasmic reticulum

A band

Myofibril

Sacromere

Excitable cells can

Generate and send electrical signals called nerve fibers

Contract

Move thin filaments over thick filaments

Generate and send electrical signals called action potentials

Skeletal muscle contractions are initiated by

T-tubules

Calcium release from the sacroplasmic reticulum

the synapse of the neuromuscular junction

Neurotransmitter release from motor neurons

The dark portion of striations in skeletal muscle is due to

I band

The presence of thin filaments

The presence of thick filaments

Overlap of thin and thick filaments

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