Glossary of Muscular System Test
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- What are the 4 main functional characteristics of skeletal muscle?
- 1. Contractibility
- What causes the appearance of striations?
- The arrangement of thick and thin myofilaments
- What is the all or none law of muscle contraction?
- If a stimulus causes one member of a motor unit to contract then all members of THAT motor unit will contract and they will do so maximally
- The muscle is NOT shortening...
- You are able to shorten the muscle to cause movement...
- The anatomical unit of skeletal muscle is...
- the sarcomere
- the functional unit of skeletal muscle is...
- a motor unit
- treppe is...
- the warm up period in muscles, where you get a stair step appearance with out changing the voltage
- what would happen if one's body produced a protein antibody that mimicked ACh but didnt open the pores?
- your muscles would not contract. the disease is called myasthenia gravis (grave disease)
- What is motortone?
- aka neuromuscular spindle...it is responsible for keeping the correct width of the sarcomere
- What is the job of a motor neuron?
- It carries messages to the muscle
- What is the job of a sensory neuron?
- it carries messages away from the muscle and to the brain/spinal cord
- What is the perimysium?
- there is a perimysium that surrounds each fascile in a skeletal muscle
- what is a fascicle?
- a fascicle is a group of muscle fibers
- What is the epimysium?
- it is the outermost connective tissue, it covers the skeletal muscle
- The nucleus of a muscle cell is...
- eccentrically located
- What is the endomysium?
- an envelope that seperates muscle fibers
- What is the sarcolemma?
- It covers one muscle fiber, it is found just under the endomysium
- What is a myofibril?
- It is a subunit of a muscle fiber
- What is a muscle fiber(cell)?
- it is a subunit of a fascicle...many muscle fibers create ONE fascicle
- What is a myofilament?
- It is a subunit of a myofibril
- What is the sarcolemma equivalent to?
- a cell membrane
- What are the 2 structures that sarcomplasmic reticulum take?
- 1. cistern
2. tubular portion/fenestrated window
- What is the purpose of the cistern?
- it is the bag like portion and it is loaded with calcium ions when relaxed
- What is the purpose of the tubular portion of the sarcoplasim reticulum?
- it connects one cistern to another
- What types of myofilaments make up a myofibril?
- Thick and thin myofilaments
- What is the sarcomere?
- it is the area(on a myofibril)between the z-discs...so there are both thick and thin myofilaments
- What is the A band?
- it is the area of overlap between thick and thin myofilments
- What is the H zone?
- it is the area of thick myofilaments...this area becomes smaller as the muscle contracts
- What is the I band?
- where there are only thing myofilaments
- What is the z-disc?
- it is connective tissue, a plate in the form of a disc...the thin myofilaments attatch to the z-line
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