Muscles

Quiz
•
Biology, Chemistry
•
University
•
Hard
c l a i r e .
Used 38+ times
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23 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Put the following stages of neuromuscular transmission into the correct temporal sequence
1. Ach diffuses across the cleft
2. voltage-gated Ca2_ channels in axon terminal open
3. generation of end-plate potential
4. reabsorption of choline by axon terminal
5. binding of Ach to receptors on sarcolemma
1,5,3,4,2
2,1,3,4,5
2,1,5,3,4
1,5,4,3,2
5,4,2,1,3
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following statements about thick filaments is/are TRUE?
1. thick filaments are in the order of 12-18 nm in diameter
2. thick filaments are around 1.6 microns in length
3. each thick filament is made up of a large number of molecules of the protein myosin all packed togeher
2 & 3
2 only
1, 2 & 3
3 only
1 only
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A number of muscle fibres collected together by a connective tissue sheath are known as which of the following?
tendon
motor unit
sarcolemma
fascicle
fibula
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The motor-end plate is the name given to which of the following?
group of myofibrils immediately below the neuromuscular junction
region where motoneurone axon terminal loses its myelin sheath
cover that seals the drive shaft on a Holden Commodore
part of neuromuscular junction that is closest to motoneurone soma
region where motoneurone axon terminal and sarcolemma are in close apposition
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following statements concerning the structure of a myofibril is/are TRUE?
1. the distance between the two bands is known as the sarcomere
2. the dark bands are caused by thin filaments and the light bands by the thick filaments
3. the Z line is caused by the junction between successive blocks of thick filaments
1 only
1, 2 & 3
1 & 2
2 & 3
2 only
Answer explanation
3. thin filaments
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following statements about skeletal muscle is/are TRUE?
1. under the light microscope skeleta muscle appears striated
2. alternating dark and light bands are caused by highly ordered arrangement of thin and thick filaments within myofibril
3. dark bands known as I bands, light bands as A bands and thin line which is sometimes observed splitting I bands is known as Z lines
1, 2 & 3
2 & 3
1 & 2
2 only
1 only
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following statements is/are TRUE?
1. thin filaments are in the order of 5-8 nm in diameter
2. thin filaments are around 1 micron long
3. thin filaments contain two chains of myosin which are twisted around each other to form a double helix
2 & 3
1 & 2
2 only
1 only
1, 2 & 3
Answer explanation
3. two chains of tropomyosin
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