Worksheetsmuscle contraction quiz
Total questions: 15
Worksheet time: 8mins
The only energy source that can be used to directly power muscle contraction is
acetylcholine (Ach)
ATP
cross bridges
neuromuscular junction
The heads of the myosin myofilaments form __ when they link the thick and the thin filament together
acetylcholine (Ach)
ATP
cross bridges
neuromuscular junction
Which of the following occur when ATP binds to the myosin head?
Myosin head change to low energy configuration
Myosin head undergoes power stroke
Myosin head detach from actin
Myosin head forms cross bridge
The sarcoplasmic Reticulum acts as a reservoir for what?
acetylcholine
Na+
K+
Ca+2
Which of the following types of muscle tissue is striated and used to control your voluntary muscles?
smooth
cardiac
Skeletal
gastrointestinal
Which structure is the sarcomere on the diagram above?
A
B
F
D
Which two structures block the active site on an actin filament?
fascicle & actin
actin & perimysium
troponin & tropomyosin
actin & myosin
A muscle fiber cannot contract until _______________ rushes into the cell to remove the blocking molecules and make the active site available to be engaged.
Calcium
ATP
Myosin
Sarcomere
When a myosin head engages with the active site on the other filament, this is known as a(n)
Sarcomere
Z-line
cross-bridge (power stroke)
M line
According to the sliding filament theory, how does muscle contraction occur?
Myosin heads form cross bridges and pull thin filaments, causing them to slide.
Both thick and thin filaments shorten as the muscle contracts.
A bands bunch up and shorten as myosin heads attach to thin filaments.
Myosin heads attach and detach from thin filaments, causing thin filaments to shorten.
This image shows a ________?
Sarcomere
Fascicle
Neuromuscular Juntion
Prime mover
