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Questions and Answers
What is the shape of skeletal muscle fibers?
What is the shape of skeletal muscle fibers?
- Square
- Cylindrical (correct)
- Spindle-shaped
- Rectangular
Cardiac muscle is controlled voluntarily by the nervous system.
Cardiac muscle is controlled voluntarily by the nervous system.
False (B)
Where is smooth muscle typically found in the body?
Where is smooth muscle typically found in the body?
Walls of blood vessels and alimentary canal
Skeletal muscle is attached to the bones by __________.
Skeletal muscle is attached to the bones by __________.
Match the following muscle types with their characteristics:
Match the following muscle types with their characteristics:
What is a characteristic of smooth muscle contraction?
What is a characteristic of smooth muscle contraction?
The diameter of skeletal muscle fibers ranges from 0.02 mm to 0.08 mm.
The diameter of skeletal muscle fibers ranges from 0.02 mm to 0.08 mm.
What structure acts as an intrinsic pacemaker in cardiac muscle?
What structure acts as an intrinsic pacemaker in cardiac muscle?
Study Notes
Muscle Groups Overview
- Three main muscle groups: Striated (Skeletal), Non-Striated (Smooth or Visceral), and Cardiac.
Striated/Skeletal Muscle
- Responsible for voluntary movements, including limb motion and posture maintenance.
- Attached to bones via tendons; both ends articulate with the skeleton.
- Muscle fibers are cylindrical, ranging from 0.02 to 0.08 mm in diameter.
- Length of fibers can vary significantly, from 40 mm to 35 cm.
- Each skeletal muscle has blood vessels and nerves associated with it.
- Fiber arrangement is tailored to the specific function of the muscle.
Non-Striated/Smooth/Visceral Muscle
- Found in soft tissue structures, such as the walls of blood vessels and the alimentary canal.
- Contractions can be sustained for long durations and only relax briefly.
- Cells are spindle-shaped, long and narrow, with a single central nucleus.
- Diameter of fibers ranges from 0.005 mm to 0.01 mm, while length varies from 0.03 mm to 0.2 mm.
- This muscle type operates under the autonomic nervous system.
Cardiac Muscle
- Exclusively located in the heart, responsible for pumping blood.
- Exhibits rhythmic contractions regulated by an intrinsic pacemaker.
- Characterized by rectangular-shaped fibers and intercalated discs for connectivity.
- Functions under the autonomic nervous system, similar to smooth muscle.
Comparison of Muscle Types
- Striated muscle allows voluntary control; smooth muscle operates involuntarily; cardiac muscle maintains heart rhythms.
- Structural differences among muscle types influence their function and control mechanisms.
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Description
Explore the three main muscle groups in this quiz: Striated (Skeletal), Non-Striated (Smooth), and Cardiac. Learn about their functions, structure, and characteristics to enhance your understanding of muscle anatomy. Test your knowledge with relevant questions!
