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Muscle Structure and Function

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Questions and Answers

What is the primary characteristic of reflexive movements?

They are controlled voluntarily

They require conscious control

They are involuntary and happen unconsciously (correct)

They occur spontaneously

What is the role of actin and myosin molecules in skeletal muscles?

They inhibit muscle contraction

They make up the contractile mechanism (correct)

They facilitate muscle relaxation

They prevent muscle damage

What is a characteristic of rhythmic movements?

They are under conscious control

They involve paired sets of muscles that alternately contract and relax (correct)

They are controlled primarily by circuits in the brain

They occur only in response to external stimuli

What is the term used to describe muscle cells in skeletal and smooth muscle?

Muscle fibers Signup and view all the answers

Which type of movement can get more accurate with practice and learning?

Voluntary movements Signup and view all the answers

What is the meaning of the prefix 'myo-'?

Related to muscles Signup and view all the answers

What is the definition of excitability in muscle cells?

The ability to respond to external signals Signup and view all the answers

What is the characteristic of striated muscle?

It has a striped appearance Signup and view all the answers

Study Notes

Types of Motor Behavior

Reflexes: involuntary movements that happen unconsciously, triggered by a peripheral stimulus, and may be overridden by conscious control.
Rhythmic movements: motor patterns controlled by spinal cord circuits, involving paired sets of muscles that alternately contract and relax, occurring spontaneously or via voluntary control.
Voluntary movements: self-initiated movements under conscious control, triggered by external events, and can improve with practice and learning.

Muscle Terminology

Muscle fibers: term used to describe muscle cells in skeletal and smooth muscle.
Prefixes related to muscles: 'myo-', 'mys-', and 'sarco-' (e.g. myocardium, sarcoplasm, epimysium).
Striated: striped, e.g. striated muscle has a fine striped appearance.

Muscle Structure and Function

Muscle function: contraction and relaxation of muscle cells (fibers) to facilitate movement.

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Description

Explore the differences between reflexive, rhythmic, and voluntary movements, and delve into the anatomy and function of skeletal, cardiac, and smooth muscle. Learn about the contractile mechanism of actin and myosin molecules in skeletal muscle.