WorksheetsCh. 6 Muscular System Review
Total questions: 11
Worksheet time: 8mins
Name
Class
Date
1.
What is the name of the thick myofilaments?
a)
Actin
b)
Myosin
c)
Myoglobin
d)
Titan
2.
What is the name of the thin myofilaments in the muscle cell?
a)
Actin
b)
Myosin
c)
Myoglobin
d)
Titan
3.
Calcium:
a)
causes ATP binding to actin
b)
increases the action potential along the sarcolemma
c)
binds to proteins on myosin
d)
triggers the uncovering of the myosin binding sites on actin
4.
When a muscle contracts, it _______
a)
gets longer
b)
gets shorter
c)
gets thinner
d)
grows hair
5.
covers the actin and prevents the myosin head to attach to the actin (rope or strand shape).
a)
tropomyosin
b)
Myosin and actin
c)
Calcium and Oxygen
d)
Glycogen and hemoglobin
6.
What ions free the actin strands and allow muscle contraction to occur?
a)
POTASSIUM
b)
CALCIUM
c)
SODIUM
7.
The contractile unit of a myofibril consisting of Z-lines, A-bands, and I-bands.
a)
A BANDS
b)
Z LINES
c)
SARCOMERES
d)
SARCOLEMMA
8.
point of contact between a motor neuron and a skeletal muscle cell
a)
I band
b)
neuromuscular junction
c)
Sarcoplasmic reticulum
d)
Epimysium
9.
Neurotransmitter that produces an impulse in a muscle cell
a)
serotnoin
b)
dopamine
c)
epinephrine
d)
acetylcholine
10.
What two proteins prevent the myosin heads from binding to the actin strands?
a)
troponin
b)
globulins
c)
tropomyosin
d)
fibrin
11.
When Acetylcholine binds to the channels ____ ions will enter the muscle cell and ____ ions will leave the muscle cell
a)
Na; K
b)
K; Na
c)
Na; Ca
d)
Ca; Na
100 %
