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23 terms

chapter 6 vocab 1: muscles

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Maximus
very big, very large, very great
Antagonist
a muscle that neutralizes or counteracts the effects of another muscle
Cardiac muscle
the muscle tissue of the heart
Insertion
movable attachment of a muscle
I band
The region of the sarcomere made up only of thin filaments. The I band is bisected by a Z line. I bands alternate with A bands to give skeletal and cardiac muscle a striated appearance. I bands get shorter (and may disappear completely) during muscle contraction.
Glucose
the form of sugar that circulates in the blood and provides the major source of energy for body tissues. When its level is low, we feel hunger.
Immovable bone
origin of muscle??
Myosin
A protein present in muscle fibers that aids in contraction and makes up the majority of muscle fiber; A type of protein filament that interacts with actin filaments to cause cell contraction.
Smooth muscle
a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart). involuntary muscle, not striated
Origin
attachment of a muscle that remains relatively fixed during muscular contraction
Epimysium
Connective tissue layer surrounding an individual muscle
Lactic acid
product of fermentation in many types of cells, including human muscle cells, causng the muscles to get sore
Movable bone
muscle's insertion
Actin
a contractile protein of muscle
Skeletal muscle
Voluntary, striated muscle that moves bones, works in pairs and is attached to bones by tendons
Oxygen debt
Respiration in the absence of sufficient oxygen leads to a build up of lactic acid that has to be cleared when sufficient oxygen is available.
Endomysium
thin connective tissue surrounding each muscle cell. (fiber?)
ATP (adenosine triphosphate)
main energy source that cells use for most of their work
Synergist
muscles that contract simultaneously with the prime mover to facilitate more effective movement(helps execute movement or steady a part)
Tendon
a band of fibrous tissue that connects muscle to bone
Acetylcholine
a neurotransmitter that triggers muscle contraction and affects learning and memory
Z band
actin attached to the ends of the sarcomere- the muscle fiber does not move but follows the contraction of the actin
Sarcolemma
cell membrane of a muscle cell