MEDIUM
AS and A Level
IMPORTANT
Earn 100
Suggest why impulses travel in only one direction at synapses.
Important Questions on Control and Coordination
HARD
AS and A Level
IMPORTANT
Suggest why if action potentials arrive repeatedly at a synapse, the synapse eventually becomes unable to transmit the impulse to the next neurone.
EASY
AS and A Level
IMPORTANT
Make a table to compare coordination in mammals by the nervous system and by the endocrine system.
MEDIUM
AS and A Level
IMPORTANT
Name the type of muscle tissue shown in given figure. Explain your answer.
MEDIUM
AS and A Level
IMPORTANT
Make a simple diagram to show the arrangement of the thick and thin filaments in a sarcomere of a resting muscle. Show and label the following: one thick filament, four thin filaments, and two Z lines.
EASY
AS and A Level
IMPORTANT
Draw a diagram to indicate and label the following: A band, I band and H band.
HARD
AS and A Level
IMPORTANT
The average length of a sarcomere in a resting muscle is 2.25 . Calculate the magnification of your diagram and state the steps you took in making the calculation.
MEDIUM
AS and A Level
IMPORTANT
LSs and TSs of striated muscle fibres were examined in an electron microscope. In the given picture shows drawings of the structures visible in a sarcomere in LS and TS as seen in a TEM. Explain why an electron microscope rather than a light microscope was used to study these sections.
MEDIUM
AS and A Level
IMPORTANT
Name the structures A, B, and C in the given figure.
