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Lecture 12 Musles

Muscles Tissues &Disorders

QuestionAnswer
The type of muscle found in the walls of the digestive tract is? smooth muscle
Heart muscle is also know as? cardiac muscle
The most abundant type of muscles in the human body is a striated muscle,also known as? skeletal muscle
Muscles that work against each other are said to be? antagonistic
The submicroscopic filaments of a muscle cell are known as? myofibrils
The functional unit of muscle activity is know as the? sacromere
The thick filaments in the central portion of the sarcomere are composed of the protein? myosin
The thin filaments of a sarcomere are composed of the protein actin
The thin filaments of the sarcomere in a skeletal muscle fiber are anchored to the Z-line
The theory explaining the contraction of muscle fibers is called the? sliding filament theory
During muscle contractions,the thick filaments pull on the thin filaments attached to the Z-line and shorten the? sarcomere
The primary source of energy for muscle contraction is? ATP
Red muscle has oxygen stored in a red-pigmented molecule called? myoglobin
The continual contractions of muscle fibers require supply of the energy molecule ATP
White muscle is so-named because it has little or no myoglobin
White muscle is not able to store much oxygen
White muscle uses stored glycogen for energy,and it is sometimes called glycolytic muscle
When a muscle is at rest,myosin heads are prevented from binding to actin by a protein called tropomyosin
Muscles are triggered to contract following release of the neurotransmitter Acetylcholine (ach)
The first ion utilized during muscle contraction is sodium (Na+)
Calcium ions are stored in muscles cells within infoldings of the plasma membrane called transverse tubules
Following the release,calcium ion trigger muscle contraction by binding to the molecule troponin
The binding of calcium to troponin cause a shift in the molecule tropomyosin
The shift of position of tropomyosin unmasks the sites on actin filaments that bind to the heads of myosin
Created by: 749069373
 

 



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