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Questions and Answers
What type of muscle is striated and has multiple nuclei?
Which muscle type is found in the myocardium of the heart?
What is the primary control mechanism for smooth muscle?
Which movement is characterized by the bending of a joint?
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In anatomical terms, what does adduction refer to?
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Study Notes
Muscular System
- The muscular system is comprised of skeletal, smooth, and cardiac muscle.
Skeletal Muscle
- Attached to bones, enabling movement.
- Examples include muscles in the upper and lower limbs.
- Controlled voluntarily (somatic nervous system).
- Muscle fibers are striated and multinucleated.
Smooth Muscle
- Found in the gastrointestinal tract, urinary bladder, blood vessels, and respiratory tract.
- Controlled involuntarily (autonomic nervous system).
- Muscle fibers are spindle-shaped with a single nucleus.
Cardiac Muscle
- Located in the myocardium of the heart.
- Self-regulating (autonomically regulated); spontaneous contractions.
- Muscle fibers are striated with a single nucleus.
- Fibers branch and fuse to form a syncytium.
Terms of Movement
- Flexion: Bending a joint.
- Extension: Straightening a joint.
- Abduction: Movement away from the midline.
- Adduction: Movement towards the midline.
- Circumduction: Circular movement of a limb.
- Medial Rotation: Rotating a bone so that its anterior surface faces medially.
- Lateral Rotation: Rotating a bone so that its anterior surface faces laterally.
- Supination: Rotating the forearm so that the palm faces upwards.
- Pronation: Rotating the forearm so that the palm faces downwards.
- Inversion: Movement of the sole of the foot inward.
- Eversion: Movement of the sole of the foot outward.
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Description
This quiz covers the three types of muscles in the muscular system: skeletal, smooth, and cardiac muscle. It includes details on their structure, function, and control mechanisms, as well as terms related to movement. Test your knowledge and understanding of muscular anatomy!
