Download Name: Louigi Victor Module: Muscular Test topic/animation: My

Name: Louigi Victor
Module: Muscular
Test topic/animation: My animations/All animations
Test type: Multiple choice
Score: 17/20
Percent correct: 85%
The following question(s) were incorrectly answered.
Animation: Neuromuscular junction
Question: The neurotransmitter at the neuromuscular junction increases permeability of the
muscle cell membrane to...
Answer: Sodium ions
Explanation: Acetylcholine increases the muscle cell membrane permeability to sodium ions.
Animation: Neuromuscular junction
Question: Increased calcium ion permeability of the presynaptic terminal cell membrane is caused
by an...
Answer: Action potential
Explanation: An action potential increases the permeability of the presynaptic terminal cell
membrane.
Animation: Cross bridge cycle
Question: What is released when myosin heads attach to actin filaments?
Answer: Phosphate
Explanation: Phosphate is released when myosin heads attaach to actin myofilaments.
The following question(s) were correctly answered.
Animation: Skeletal muscle
Question: Which connective tissue wrapping separates individual muscle fibers?
Answer: Endomysium
Explanation: Endomysium (endo is Greek for "within") surrounds each muscle fiber.
Animation: Skeletal muscle
Question: Myofibrils are composed of protein filaments called actin and myosin.
Answer: True
Explanation: Myofibrils are composed of protein filaments called actin and myosin.
Animation: Skeletal muscle
Question: A skeletal muscle fiber (cell) contains a single nucleus.
Answer: False
Explanation: A single skeletal muscle fiber contains multiple nuclei; smooth muscle cells contain a
single nucleus; cardiac muscle contains one or two nuclei.
Animation: Skeletal muscle
Question: A bundle of muscle fibers is known as a...
Answer: Fascicle
Explanation: A bundle of muscle fibers is known as a fascicle.
Animation: Skeletal muscle
Question: The muscle cell membrane is called the...
Answer: Sarcolemma
Explanation: The sarcolemma is the muscle cell plasma membrane.
Animation: Neuromuscular junction
Question: The neurotransmitter at the neuromuscular junction is...
Answer: Acetylcholine
Explanation: Acetylcholine is the neurotransmitter at the neuromuscular junction.
Animation: Neuromuscular junction
Question: Choline formed from the breakdown of acetylcholine in the synaptic cleft is...
Answer: Resorbed by the presynaptic terminal membrane
Explanation: Choline is resorbed through the presynaptic terminal membrane for re-use.
Animation: Neuromuscular junction
Question: Movement of sodium ions into the muscle cell at the neuromuscular junction causes...
Answer: Depolarization of the muscle cell membrane
Explanation: Sodium ions entering the muscle cell causes depolarization of the muscle cell
membrane.
Animation: Sliding filament
Question: The I-band of a sarcomere is widest when a muscle is relaxed.
Answer: True
Explanation: The I-band is widest when a muscle is relaxed.
Animation: Sliding filament
Question: In a fully contracted sarcomere, the actin myofilaments...
Answer: Overlap
Explanation: During full contraction of a sarcomere, the actin myofilaments overlap .
Animation: Sliding filament
Question: In a fully contracted sarcomere, the H zone...
Answer: Disappears
Explanation: During full contraction of a sarcomere, the H zone disappears.
Animation: Sliding filament
Question: Which region of the sarcomere does not change length between muscle relaxation and
muscle contraction?
Answer: A band
Explanation: The A band of the sarcomere is constant in length.
Animation: Sliding filament
Question: The area between two Z discs is termed a...
Answer: Sarcomere
Explanation: The area between two Z discs is termed a sarcomere.
Animation: Cross bridge cycle
Question: The actin-myosin bond is broken by the attachment of...
Answer: ATP
Explanation: The actin-myosin bond is broken by the attachment of ATP.
Animation: Cross bridge cycle
Question: During muscle contraction, binding sites for myosin are uncovered by the movement
of...
Answer: Tropomyosin
Explanation: During muscle contraction, myosin binding sites are uncovered by the movement of
tropomyosin.
Animation: Cross bridge cycle
Question: Energy produced when ATP is converted to ADP and phostphate is stored in...
Answer: Myosin heads
Explanation: Energy produced when ATP is converted to ADP and phosphate is stored in the
myosin heads.
Animation: Cross bridge cycle
Question: During muscle contraction, calcium ions bind to...
Answer: Troponin
Explanation: During muscle contraction, calcium ions bind to troponin.