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Questions and Answers
Which characteristic is unique to cardiac muscle?
Which type of muscle is associated with the movement of soft tissue structures in the body?
How long can contractions of smooth muscle be sustained?
What is the typical shape of skeletal muscle fibers?
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Which type of muscle is under voluntary control?
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Which statement about cardiac muscle is true?
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What is the primary function of striated or skeletal muscle?
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Which of the following is a characteristic of smooth muscle cells?
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Study Notes
Muscle Groups
- There are three main muscle groups: Striated/Skeletal, Non-Striated/Smooth/Visceral, and Cardiac.
Striated/Skeletal Muscle
- Contracts to move limbs
- Maintains posture
- Both ends of the muscle articulate with the skeleton
- Each skeletal muscle fibre is roughly cylindrical in shape
- The fibre arrangement depends on the muscle's function
- Each muscle fibre is long and cylindrical, between 0.02 to 0.08 mm in diameter and 40 mm to 35 cm in length.
- Attached to bones by tendons
- Has blood vessels and nerves associated with it
- Under voluntary control
Non-Striated/Smooth/Visceral Muscle
- Found where movement of soft tissues structures is required, e.g., walls of blood and lymphatic vessels, alimentary canal
- Only relaxes for short periods of time
- Contraction of smooth muscle can be sustained for long periods if required
- Cells are spindle-shaped
- Under the autonomic nervous system
- The cells are long and narrow, spindle-shaped with one centrally placed nucleus.
- They are 0.005mm to 0.01mm in diameter
- They are 0.03mm to 0.2mm long
Cardiac Muscle
- Only found in the wall of the heart
- Exhibits rhythmic contractions
- Under the autonomic nervous system
- Has an intrinsic pacemaker system
- Has intercalated discs
- Each fibre is rectangular in shape
Comparisons Microscopically
- Skeletal muscle: Has striations, multiple nuclei per cell
- Smooth muscle: Has no striations, one nucleus per cell
- Cardiac muscle: Has striations, one nucleus per cell, intercalated discs
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Description
Explore the three main muscle groups: Striated/Skeletal, Non-Striated/Smooth, and Cardiac muscles. Learn about their structure, function, and control mechanisms. This quiz will help you understand the role of each muscle type in the human body.
