MYP4-5 Nervous system basic

Identify the parts of the neuron.

a

b

c

d

e

f

Cell Body

Nucleus

Axon terminal

Node of Ranvier

Myelin sheath

Dendrites

... are chemicals that transmit signals between neurons

A ... is a cleft between 2 neurons where the signal is transmitted

Put the events of an action potential in the correct order.

• Repolarization

• Depolarization

• Stimulus

• Refractory period

In resting state the membrane potential is ​ (a)   70. When a stimulus is strong enough, an action potential is generated. First ​ (b)   channels open. As this is a​ (c)   ion, the membrane potential ​ (d)   . The efflux of ​ (e)   ions brings the potential back.

• negative
• Sodium
• positive
• increases
• Potassium
• Chloride
• decreases

Match the stimulus with the receptor

• Pressure and vibration detection

• Nociceptors

• Pain detection

• Mechanoreceptors

• Pressure detection

• Chemoreceptors

• Temperature detection

• Thermoreceptors

• Smell and taste detection

• Baroreceptors

Identify the parts of the central nervous system.

What does the "all or nothing" rule mean in regards of a nerve response?