The Muscular System Flashcards
(48 cards)
myo-, mys-, and sarco- is latin for ____
Little Mouse
Approximately how many muscles in the human body?
Approx 700
Muscles account for ___% of total bjody weight
40-50%
Elongated cells packed with contractile proteins
Myosin and Actin
Muscles contract on ________
conscious command OR reflexive response
4 Muscle Characteristics
Excitability, Contractility, Extensibility, Elastin
Excitibility
Responds to external stimuli
Contractility
Actively shortens along longitudinal axis
Extensibility
Can stretch beyond original length, without tearing
Elastin
Stretches out and recoils back to original length
The complete action of the organ is the result of the action ____
of the individual cell
This is filled with muscle fibers, connective tissue, nervous tissue, and epithelial tissue
Muscle Organ
Muscle Function
To change chemical energy into mechanical energy
The chemical energy for a cell is ___
ATP
ADP breaks down into
ADP, inorganic phosphate, and energy
When mechanical energy is produced, it allows us to:
Produce skeletal/skin movement, maintain posture, supports soft tissue, regulating incoming and outgoing material along a tract, and maintains body temperature
A lot of organs are anchored/supported by ____
connective tissue
Doors of smooth muscles moving substances throughout the body
Sphincter Muscles
Smooth muscles have ____ & ____, but no _____.
Have actin and myosin, but no sarcomeres (so no striations)
-soma
body
Skeletal muscles have _______, which indicate that there are sarcomeres
striations
Skeletal muscles have _____ fibers, ________ nuclei, voluntary/involuntary control, can/can’t divide, will ___ over time, and is attached to the _____
cylindrical fibers, multiple/peripheral nuclei, voluntary control, cannot divide, will fatigue over time, and are attached to skeleton and skin
Every muscle ORGAN has at least one ____, one___ and one ___.
Artery, vein, nerve
Muscle cells are ______that may be > ___ft long and lay _____ to each other.
fibers; 1ft; parallel
