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Questions and Answers
What is the main function of skeletal muscles in the body?
What is the main function of skeletal muscles in the body?
- Control of airway diameter
- Movement of the body (correct)
- Regulation of body temperature
- Pumping blood throughout the body
What is a characteristic of smooth muscles?
What is a characteristic of smooth muscles?
- Multinucleated
- Single nucleus (correct)
- Voluntary control
- Striated appearance
Which type of muscle is responsible for pumping blood throughout the body?
Which type of muscle is responsible for pumping blood throughout the body?
- Smooth muscles
- Cardiac muscles (correct)
- Skeletal muscles
- Voluntary muscles
What is a function of muscles in the body?
What is a function of muscles in the body?
What type of muscle is attached to bones?
What type of muscle is attached to bones?
What is a characteristic of cardiac muscles?
What is a characteristic of cardiac muscles?
What is a common function of skeletal and cardiac muscles?
What is a common function of skeletal and cardiac muscles?
Which type of muscle is responsible for maintaining posture?
Which type of muscle is responsible for maintaining posture?
What is a characteristic that skeletal muscles and smooth muscles have in common?
What is a characteristic that skeletal muscles and smooth muscles have in common?
Which of the following is an example of a smooth muscle?
Which of the following is an example of a smooth muscle?
What is a way that muscles help regulate body temperature?
What is a way that muscles help regulate body temperature?
Which type of muscle is found in the walls of blood vessels?
Which type of muscle is found in the walls of blood vessels?
What is a main difference between skeletal muscles and cardiac muscles?
What is a main difference between skeletal muscles and cardiac muscles?
Which of the following is a function of the muscular system?
Which of the following is a function of the muscular system?
What is a characteristic of involuntary muscles?
What is a characteristic of involuntary muscles?
Which type of muscle is involved in facilitating movement, such as walking and running?
Which type of muscle is involved in facilitating movement, such as walking and running?
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Study Notes
Overview of the Muscular System
- The muscular system is a complex system of tissues that allow movement, maintain posture, and regulate body temperature.
- There are three main types of muscles: skeletal, smooth, and cardiac.
Skeletal Muscles
- Also known as striated muscles, they are voluntary muscles that are attached to bones.
- Functions:
- Movement of the body
- Maintenance of posture
- Support of joints
- Regulation of body temperature
- Characteristics:
- Striated (striped) appearance
- Multinucleated (many nuclei)
- Voluntary control (conscious control)
Smooth Muscles
- Also known as non-striated muscles, they are involuntary muscles that are found in the walls of hollow organs.
- Functions:
- Movement of substances through organs (e.g. digestion, peristalsis)
- Regulation of blood pressure
- Control of airway diameter
- Characteristics:
- Non-striated (smooth) appearance
- Single nucleus
- Involuntary control (autonomic nervous system)
Cardiac Muscles
- Found in the heart, they are responsible for pumping blood throughout the body.
- Functions:
- Pumping blood
- Maintaining blood pressure
- Characteristics:
- Striated (striped) appearance
- Single nucleus
- Involuntary control (autonomic nervous system)
Muscle Functions
- Movement: Muscles work together to move the body's skeleton.
- Stabilization: Muscles help maintain posture and stabilize joints.
- Regulation: Muscles help regulate body temperature, blood pressure, and other bodily functions.
Muscle Types
- Fast-twitch muscles: used for high-intensity, short-duration activities (e.g. sprinting)
- Slow-twitch muscles: used for low-intensity, long-duration activities (e.g. distance running)
- Intermediate muscles: used for moderate-intensity, moderate-duration activities (e.g. jogging)
Muscle Injuries and Disorders
- Muscle strains: tears in muscle fibers
- Muscle cramps: sudden, involuntary muscle contractions
- Muscular dystrophy: genetic disorders that cause muscle weakness and degeneration
- Myasthenia gravis: autoimmune disorder that causes muscle weakness and fatigue
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