Chapter 48: Musculoskeletal Systems
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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skeletal muscle
responsible for all voluntary movements, and many involuntary actions
cardiac muscle
responsible for the beating of the heart
smooth muscle
creates movement in many hollow internal organs under the control of the autonomic nervous system
muscle fibers
skeletal muscle cells large with many nuclei
actin
thin filament, used for muscle contraction
myosin
thick filament
myofibrils
bundles of thick myosin and thin actin arranged in an orderly fashion
sarcomeres
repeating units of overlapping filaments of actin and myosin.
titin
largest protein in the body runs right through a myosin bundle(from z line to z line)
each sarcomere is bounded by
z line
centered in the sarcomere is the..
a band, which contains all the myosin filaments
H zone and I bands are..
regions where actin and myosin filaments do not overlap in the relaxed muscle
tropomyosin
twisting around the actin chains
troponin
attached to tropomyosin at intervals
motor unit
a motor neuron and all of the fibers with which it forms synapses with
sacroplasm
muscle fiber cytoplasm
T tubules
system of transverse tubules
twitch
the spread of an action potential through the muscle fiber’s T tubule system causes a minimum unit of contraction
the strength of a muscle contraction depends on…
• how many fibers are contracting 2. and at what rate
tetanus
continuous activation of the contractile machinery.
slow-twitch fibers
oxidative or red muscles contain myoglobin many mitochondria well supplied with blood vessels
fast-twitch fibers
glycolytic or white muscles fewer mitochondria little to no myoglobin fewer blood vessels look pale in comparison to slow-twitch fibers
muscle ATP systems
immediate, glycolytic, and oxidative systems
immediate system
uses performed ATP and creatine phosphate