Anatomy and Physiology of Muscle
What percentage of body weight is muscle?
50%
What is the ability to receive and respond to a stimulus?
Excitiability
How many Skeletal muscles are in the body?
More than 600
What are the three physiology of skeletal muscle?
Overall body mobility
Maintains posture and body position
Stabilizes joints
Maintains body temperature (as byproduct of other functions), contributes to homeostasis
Supports soft tissues/protects organs
Contracts rapidly, but tires easily
What is the physiology of all muscle types?
Skeletal: locomotion and manipulation
Smooth: propels or squeezes substances through organs/along tracts
Cardiac: pumps blood through body
What is contractility?
Ability to contract when adequately stimulated
What do the fibers look like? Are they striated? Are they nucleated?
Long and cylindrical
Multinucleated
Appear striated
Are skeletal muscles voluntary or involuntary? What is the definition of voluntary?
Voluntary: subject to conscious control
What is Extensibility?
Ability to increase in length(stretch)
What serves Skeletal Muscle?
Nerve, artery and vein(s) which enter/exit at central portion of muscle and branch through connective tissue sheaths
What is the force exerted on an object by a contracting muscle?
Muscle tension
What is the ability to return to resting form after shortening or lengthening?
Elasticity
Does the origin or insertion move during contraction?
Insertion
What is the force exerted on the muscle, by the weight of the object to be moved is called..
Can Muscle push?
No!
Muscles can only pull, they never push