Muscular Flashcards
What are the 3 types of muscle tissue?
skeletal, cardiac, smooth
There are over 600 muscles in the human body. T or F.
True
Muscle tissue have an electric gradient which can reverse when stimulated
Excitability
All muscle tissues have the ability to contract, or shorten
Contraction
All muscle tissues share the capacity to elongate, or relax
Elongate
Are skeletal muscle voluntary or involuntary?
Voluntary
Skeletal muscles are known as ___ muscle due to their stripped appearance under a microscope
striated
Skeletal muscles are composed of muscle fibers (cells) that are bound together in ___ ___.
parallel bundles
Are smooth muscles voluntary or involuntary muscles?
Involuntary
Where is smooth muscle tissue found?
walls of internal organs; sphincters and valves
Smooth muscle tissue aka visceral tissue is ___
nonstriated
Is cardiac muscle voluntary or involuntary?
Involuntary
Cardiac muscle tissue is ____.
Striated
Each muscle fiber contains a bundle of ___
myofibrils
Myofibrils are composted of multiple repeating control units called ___.
sarcomeres
Myofibrils contain 2 protein microfilaments. They are __ and __ filament.
thick; thin
Thick vs. thin microfilament
Thick: composed of protein myosin
Thin: composed of protein actin
When do dark bands (striations) in skeletal muscle form?
when think and thin filaments overlap
When do light bands occur?
when thin filament is overlapped
When action potential reaches a muscle fiber, what is released?
calcium ions
___ ___ is released from glucose provides the energy necessary for muscle contraction.
Adenosine triphosphate
