Responding to Change Random Retrieval

Which of the following are features of slow twitch muscle fibres:

A)Lots of aerobic respiration
B)Lots of mitochondria
C)Low levels of myoglobin

One form of muscle disease is caused by a mutated allele of a gene. This leads to production of myosin molecules that are unable to bind to other myosin molecules. If myosin molecules are unable to bind to other myosin molecules, this prevents muscle contraction. Suggest why.

Which of the above diagrams represents the myofilaments a 'Z line' in muscle?

The image above shows a muscle fibre. Name organelle A

Point C is the point where most colour sensitive photoreceptor cells are located. What is it called?

Layer B is the layer which contains the photoreceptor cells. What is it's name ? ( Type your answer).

Name part B on the above diagram (type your answer).

Name part A on the above diagram.

Axons with a wider diameter axon have...

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.

True or False: A stronger stimulus will generate more frequent action potentials.

Put the above events ( A-F) in order for the passage an action potential.

Name protein A in the above diagram.

Across a resting human neurone plasma membrane, what is the average potential difference?

How can charged ions cross a plasma membrane?

• a) Simple Diffusion
• b) Facilitated Diffusion
• c) Active Transport

Flatworms turn more frequently in response to an increase in light intensity. Is this taxis or kinesis?

True or false : Kinesis is a random movement

True or False : Taxis is when an organism either moves faster in harsh conditions or turns less in harsh conditions.

Mica is like thin glass, and is impermeable to most substances. What does Boysen Jensen's experiment inserting mica show ?

What word describes the growth response of a plant to a stimulus?