8 Questions
What is the primary characteristic of reflexive movements?
They are involuntary and happen unconsciously
What is the role of actin and myosin molecules in skeletal muscles?
They make up the contractile mechanism
What is a characteristic of rhythmic movements?
They involve paired sets of muscles that alternately contract and relax
What is the term used to describe muscle cells in skeletal and smooth muscle?
Muscle fibers
Which type of movement can get more accurate with practice and learning?
Voluntary movements
What is the meaning of the prefix 'myo-'?
Related to muscles
What is the definition of excitability in muscle cells?
The ability to respond to external signals
What is the characteristic of striated muscle?
It has a striped appearance
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.
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.
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