OCR Biology - Neuronal Coordination

What are the 3 things mammalian neurons have in common?

• Cell Body, Myelin Sheath & Nucleus

• Myelin Sheath, Nodes of Ranvier & Cell Body

• Cell Body, dendrons & axons

• Dendrons, axons & myelin sheath

True or False? Sensory neurons have one dendron that carries impulses to the cell body.

• True

• False

True or False? The cell body in a sensory neuron is found very close to the short dendron and it has a long axon

• True

• False

True or False? Motor neurons have one long axon but may have many dendrites

• True

• False

What are layers of myelin sheath made up of?

• Plasma membranes

• Schwann Cells

• Schwan Cells

• Specialised cells with voltage channels

What is the average speed for a myelinated neuron?

• 1 m/s

• 10 m/s

• 100 m/s

• 1000 m/s

Schwann cells are permeable to sodium and potassium ions. True or false?

• True

• False

What is the space between myelinated and non-myelinated sections of an axon called?

• Nodes of Ravier

• Nodes of Ranvier

• Nodes of Ranier

• Nodes of Raviuer

What is the term used to describe how the action potential moves along a myelinated axon?

• Saltatory Propagation

• Propagation

• Salutatory Conduction

• Saltatory Conduction

What is an energy transducer?

• A receptor that sends a nerve impulse

• A receptor that sends an action potential

• A receptor that is adapted to detect changes

• A receptor that converts one form of energy to another