Muscle, Nervous System Flashcards
Type of muscle is involuntary, possesses striations, and demonstrates an intermediate twitch?
Cardiac
Which connective tissue membranes surrounds each fascicle?
Perimysium
Refers to The contractile unit of a muscle and extends from Z disc to Z disc
Sarcomere
Filament is made up of __?
Actin
Blocks the myosin binding sites on actin during periods of rest
Tropomyosin
Depolarization of the sarcolemma is the result of __ ions rushing into the muscle cell membrane
Na (sodium)
All muscles controlled by a single motor neuron
Motor unit
Contractions that permit the muscle to shorten
Concentric
During a typical myogram, the contraction period corresponds to ___.
Increasing calcium levels
Division of the nervous system often called the “rest and digest” division & is characterized by the three Ds: digestion, diuresis, and defecation
Parasympathetic
Neuroglial cells that regulate the environment around the cell body of a neuron in the CNS (blood brain barrier)
Astrocyte
The process of a neuron that typically receives impulses from adjacent neurons
Dendrite
The outer layer of a Schwann cell where all the cytoplasm and organelles are located
Axolemma
The period after an initial stimulus has been received and when the neuron is not sensitive to another stimulation
Refractory period
Ion that enters the axon terminal to stimulate the release of neurotransmitters by exocytosis
Ca (calcium)
How many pairs of spinal nerves do humans have?
31
Which nerve innervates the adductor muscles on the medial surface of the thigh?
Saphenous
A dense layer of collagen fibers that surround the entire muscle
Epimysium
A delicate connective tissue that surrounds each individual skeletal muscle cell
Endomysium
Formed when collagen fibers of the connective tissue merge together to form a bundle
Tendon
Formed when collagen fibers of the connective tissue merge together to form a broad sheet
Aponeurosis
Groups of embryonic cells
Myoblasts
The cytoplasm of a muscle cell
Sarcoplasm
The plasma membrane of a muscle cell
Sarcolemma
For passageways through the muscle cells allowing electrical impulses to travel into the cells interior
Transvers (T) Tubules
The dense region of the sarcomere that contains overlapping thick and thin filaments (both myosin and actin)
A band
On either side of the A band, only contains thin filaments (actin)
I band
In the middle of each A band, contains only think filaments (myosin)
H band
In the middle of each H band
M band
Mark the boundary between adjacent sarcomeres. Consist of proteins called actinins.
Z lines
