Responding to Change Random Retrieval

Which protein blocks the actin-myosin binding site in a relaxed myofibril?

The image above shows a muscle fibre. What is the function of organelle E?

The image above shows a muscle fibre. Name organelle C

What type of sodium channels are opened when a Pacinian corpuscle is stimulated?

What is the stimulus detected by a Pacinian corpuscle? (type your answer)

If the concentration of neurotransmitter secreted is very low, then threshold may not be reached. What term describes the process of increasing neurotransmitter release? either by multiple presynaptic neurones forming a single synapse or increasing the frequency of neurotransmitter release. Type your answer

Using the diagram, name E

True or False - The speed of conduction along an unmyelinated neurone is around 5 m/s ( jogging pace).

Once an action potential has been generated, why is the wave of depolarisation only in one direction?

Many peripheral neurones (including motor neurones)have cells wrapped around the axon.

What are these cells called? ( type your answer- watch your spelling).

After an action potential has fired, the refractory period acts as the following:

• a) Prevents action potentials overlapping
• b) Limit the frequency of action potentials
• c) Limit the size of action potentials
• d) Makes action potentials travel unidirectionally.

Which of the events (A - F above) starts depolarisation? Type the letter in the box

Name the process happening at '4' on the above diagram?

What do we call the process happening at '3' on the above diagram?

Name protein A in the above diagram.

In the above experiment, you hypothesised that a woodlouse responds by kinesis to a change in light intensity. What would be the best way to measure a response which shows kinesis?

Maggots follow a scent up a concentration gradient towards a food source. Is this taxis or kinesis?

What would be a suitable control for Went's experiment ?

What does Darwin's experiment where he removed a shoot tip then replaced it show?

What response do roots have to light?