Muscle 1a Flashcards
How is muscle physiology similar to the nervous system?
Excitable (polarized at rest)
Conducts (AP over skeletal muscle membrane)
How is muscle physiology not similar to the nervous system?
its contractile which means that it can shorten
Smooth muscle is
Non-striated involuntary muscle
Where is smooth muscle found
In the walls of hollow organs
examples of places where smooth muscle is found
Digestive, reproductive, respiratory, urinary, blood vessels
Smooth muscle may have intrinsic tone or
Rhythm
How many nuclei does each smooth muscle cell have
one
Describe the cardiac muscle
Involuntary muscles found in the walls of the heart
Smooth and cardiac muscle may have intrinsic tone or rhythm even in the absence of
The nervous system (pacemaker cells)
Cardiac muscles branch and form special connections with each other called
Intercalated disks (interdigitate)
What do intercalated disk create?
A functional synctium (acting as one)
In a functional synctium, an AP can
Travel from one cell to another
Each cardiac muscle cell has
one nucleus and are striated
What do skeletal muscle attach to?
the skeleton for voluntary movement
Skeletal muscle is controlled by the
somatic nervous system
3 characteristics of skeletal muscle cells
Each have many nuclei, prominent striations (microscopic), and each skeletal muscle cell is innervated by the somatic nervous system
Skeletal muscle contractions are
fast
Neuromuscular junction (NMJ) is where it is
innervated by an Alpha Motor Neuron
