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WorksheetsIntro to Muscles
Total questions: 17
Worksheet time: 9mins
Which neurotransmitter is released to activate and contract muscles?
Epinephrine
Norepinephrine
Acetylcholine
Calcium
The ________ is the connective tissue wrapping of the fascicles.
Perimysium
Epimysium
Sarcolemma
Sarcoplasm
The ________ is the connective tissue wrapping of the entire skeltal muscle.
Perimysium
Epimysium
Sarcolemma
Sarcoplasm
_______ filaments are attached to the _____ line of a sarcomere. Select all that are true!
Actin ; M
Actin ; Z
Myosin ; Z
Myosin ; M
The _________ is the entire length of myosin in a sarcomere, including overlap with actin filaments.
M line
Z line
H zone
A band
I band
The _________ is the length of myosin in a sarcomere, excluding overlap with actin filaments.
M line
Z line
H zone
A band
I band
The _______ is the length of actin filaments, excluding overlap with myosin filaments.
M line
Z line
H zone
A band
I band
Which of the following are TRUE of cardiac muscle? Select all that apply!
It is bifurcated
It has intercalated discs
It is striated
It is multinucleated
It is voluntary
Which of the following is TRUE of skeletal muscle? Select all that apply!
It is involuntary
It is multinucleated
It is associated with bones
It is unstriated
What is the term for the plasma membrane of muscle cells?
Sarcoplasm
Fasciculus
Sarcolemma
Perimysium
Epimysium
The sarcoplasmic reticulum is the ___________ of skeletal muscle and stores _________.
Rough ER ; acetylcholine
Rough ER ; calcium ions
Smooth ER ; acetylcholine
Smooth ER ; calcium ions
Myofibrils are composed of _________ filaments.
Actin and microtubule
Myosin and sarcolemic
Actin and myosin
Sarcolemic and myocyte
What are intercalated discs?
The peripheral nuclei of skeletal muscle
Bifurcations of cardiac muscle
Smooth muscle sarcomeres
Gap junctions in cardiac muscle
Cardiac muscle striations
_______ neurons innervate muscles at the _____________.
Motor ; sarcolemma
Sensory ; gap junction
Motor ; neuromuscular junction
Cardiac ; gap junction
Myomotor ; triad
At the synaptic cleft of skeletal muscles, Ach is exocytosed and attaches to __________ Ach receptors, allowing _____ ions into the muscle.
Nicotinic ; K+
Nicotinic ; Na+
Nicotinic ; Ca2+
Muscarinic ; Na +
Muscarinic ; Ca2+
The _______ receptor is attached to a ______ release channel, which releases ions necessary for muscle contraction.
Nicotinic ; Na+
Nicotinic ; Ca2+
RHD ; Na+
RHD ; Ca2+
RHD ; Acetylcholine
During muscle contraction, where does actin attach to myosin?
At the triad
At the myosin head
At the sarcolemma
At the RHD receptor
