Studied by 18 peoplemuscles
Movement of the skeletal system would not be possible without:
no
Is it possible for a single muscle to act alone to produce a movement?
yes
Should muscles be coordinated to produce movement?
two bones, a joint
What do muscles usually connect? What do muscles usually cross?
shorten
What does a contracted muscle do?
a muscle pulls on one bone while the other bone is stationary
What occurs when a contracted muscle shortens?
origin, insertion
What do you need to know about a muscle in order to determine its function?
opposing pairs
How do most muscles work in?
flexor, extensor
What is an example of an opposing pair?
40-50%
How much of an adult's body weight do muscles compose?
mechanical energy
What do the muscles convert chemical energy into?
move, stabilize, regulate organ volume, generate heat, propel and store fluids and solids through several body systems
Muscles transform chemical energy into mechanical energy to... (5 reasons)
skeletal, cardiac, smooth
What are the three types of muscle found in the body?
move bones of skeleton
What do skeletal muscles do?
striated
How do skeletal muscles appear under a microscope?
striped
What is another word for striated?
voluntary, somatic division of the nervous system
Are most of the skeletal muscles under voluntary or involuntary control? What are they in control by?
diaphragm, muscles of posture
Which skeletal muscles are under involuntary control?
skeletal
What kind of muscle is pictured here?
walls of heart
Where is the cardiac muscle only found in?
involuntary
Are the cardiac muscles under voluntary or involuntary control?
actin, myosin
What do the cardiac muscles have the same arrangement as?
mitochondria
What do cardiac muscles have more and larger of?
cardiac
What kind of muscle is pictured here?
involuntary
Are the smooth muscles under voluntary or involuntary control?
organs, vessels
Where are smooth muscles found in?
slow, last long
Describe the contractions of the smooth muscle:
a state of continued partial contraction
What is smooth muscle tone?
GI tract, walls must maintain steady pressure on the contents
What is smooth muscle tone important in? Why?
smooth
What kind of muscle is pictured here?
electrical excitability, contractility, extensibility, elasticity
What do all muscle tissue have (4 properties of muscle tissue)?
produce action potentials
What does electrical excitability do?
when muscle shortens and pulls on attachment points
What is contractility?
muscle to stretch without being damaged
What does extensibility allow for?
muscle to return to its original length after stretch or contraction
What does elasticity allow for?
organ
What is each skeletal muscle?
composed of many tissues
Why is a skeletal muscle an organ? (think definition of organ)
muscle cells (muscle fibers)
What is each skeletal muscle composed of thousands of?
fibers
What are muscle cells also known as?
a group of muscle fibers
What is a fascicle?
fascicles
What makes up a muscle (component-wise)?
protect, strengthen
What do the three layers of connective tissue do for the skeletal muscle? (2 things)
epimysium, perimysium, endomysium
What are the three layers of connective tissue of the skeletal muscles?
outermost layer, encircling around entire muscle
Where is the epimysium located in a skeletal muscle?
fascicle
What does the perimysium surround in a skeletal muscle?
fascicles
What give meat its "grain" appearance?
separate each muscle fiber (muscle cell) from each other
What does endomysium do in a skeletal muscle?
tendon
Where do the three layers of connective tissue of the skeletal muscles extend beyond the muscle to form?
attaches a muscle to a bone
What does a tendon do?
one artery, two veins, one somatic nerve
What is each skeletal muscle supplied with? (give #s for each)
within the skeletal muscle
Where are capillary beds located?
supply nutrients and take away waste
What do the capillary beds in the skeletal muscles do?
collection of many neurons
What is a somatic nerve?
branch many times to contact many muscle fibers (cells)
What does each axon of the skeletal muscle do?
Note
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