Tuesday 20th Words of the Day
Terms
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- Thermogenesis
- As muscular tissue contracts it produces heat.
- Sarcoplasmic Reticulum
- A network of saccules and tubes surrounding myofibrils of a muscular fiber. Comparable to Endoplasmic reticulum. Functions to reabsorb calcium ions during relaxation of muscle and releases the ions to cause contraction.
- Muscle Fascicle
- Specialized muscle fibers in the heart that transmit electrical impulses from the Atrioventricular Node (AV Node) to the Purkinje Fibers are fascicles, also referred to as bundle branches.
- Myofibril
- A thread like structure extending longitudinally through a muscle fiber, consisting mainly of thick filiments of myosin and thin filiments of actin, troponin, and tropomycin.
- Z-disc
- Narrow plate shaped regions of dense protein material separate one sarcomere from the next.
- Sarcomere
- A contractile unit in a striated muscle fiber extending from one z-disc to the next z-disc.
- Actin
- A contractile protein that is part of thin filaments in muscle fibers
- Myosin
- Contractile protein that makes up the thick filaments of muscle fibers
- myasthenia gravis
- a disease of impaired transmission of motor nerve impulses, characterized by episodic muscle weakness and easy fatigability, esp. of the face, tongue, neck, and respiratory muscles: caused by autoimmune destruction of acetylcholine receptors.
- fibromyalgia
- A syndrome characterized by chronic pain in the muscles and soft tissues surrounding joints, fatigue, and tenderness at specific sites in the body.
- muscular dystrophy
- a hereditary disease characterized by gradual wasting of the muscles with replacement by scar tissue and fat, sometimes also affecting the heart.
- tetanus
- an infectious, often fatal disease caused by a specific bacterium that enters the body through wounds and characterized by respiratory paralysis and tonic spasms and rigidity of the voluntary muscles, esp. those of the neck and lower jaw.
- motor unit
- a motor neuron and the muscle fibers innervated by its axon.