Chapter 1 Flashcards
Physical activity occurs due to the combined and coordinated efforts of the
muscular, nervous, an skeletal systems
The nervous system is responsible for initiating and modifying
the activation of muscles
The muscles produce movement by generating forces to rotate
bones and joints
A layer of connective tissue reffered as
epimysium
A bundle of muscle fibers is called_______. Each fasciculus is surrounded by connective tissue called_____.
- fasciculus or fascicle
- perimysium
Within a fasciculus, each muscle fiber is surrounded and separated from adjacent fibers by a layer of connective tissue referred to as
endomysium
Connective tissues epimysium, perimysium, and endomysium transmit the force action to the bone via another connective tissue structure
the tendon
Each muscle fiber is a cell. Each muscle fiber is surrounded by a plasma membrane, referred to as the _________.
Sarcolemma.
The __________ is a watery solution that contains the cell’s energy sources, such as adenosine triphosphate, phosphocreatine, glycogen, and fat droplets.
Cytoplasm
Adenosine triphosphate (ATP)
The only source of energy for muscle action)
Mitochondria is important because
They are sites of aerobic ATP production within the cell and important for aerobic exercise performance
Sarcoplasmic reticulum, t- tubules
Stores calcium , regulates muscle action processes by altering the intracellular calcium concentration. Passes ______, channels that form openings in the sarcolemma of the muscle.
A muscle fiber
a cell that is specialized to contract and generate force (tension)
Each myofibril is a bundle of ______, which primarily consist of ____ (thick), and _____ (thin) filaments.
myosin, actin
Associated with the actin filament are two other protein structures:
tropomyosin and troponin
