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Chapter 12
Chapter 12
10
Physiology
Undergraduate 3
05/01/2010

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Term
myosin
Definition

Forms thick filaments of the myofibril that convert chemical bond energy of ATP into motion
Term
actin
Definition

A globular protein (G-actin) that polymerizes to form thin filaments (F-actin)
Term
thick filament
Definition

An aggregation of myosin in muscle
Term
thin filament
Definition
An actin-containing filament of the myofibril
Term
crossbridge
Definition

Connection formed when mobile myosin heads bind to actin molecules in muscle
Term
Z disk
Definition

Sarcomere proteins to which actin filaments attach
Term
I band
Definition
Region of the sarcomere occupied only by thin filaments
Term
H zone
Definition
Region of sarcomere with only thick filaments
Term
sarcomere
Definition
The contractile unit of a myofibril
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