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Questions and Answers
What is the primary characteristic of reflexive movements?
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?
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?
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?
What is the term used to describe muscle cells in skeletal and smooth muscle?
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Which type of movement can get more accurate with practice and learning?
Which type of movement can get more accurate with practice and learning?
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What is the meaning of the prefix 'myo-'?
What is the meaning of the prefix 'myo-'?
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What is the definition of excitability in muscle cells?
What is the definition of excitability in muscle cells?
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What is the characteristic of striated muscle?
What is the characteristic of striated muscle?
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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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