Nervous System

Question 1

What is spatial summation

Answer 1

Multiple different presynaptic neurones release enough neurotransmitters at once to exceed the threshold potential and trigger an action potential.

Question 2

What is temporal summation

Answer 2

A single presynaptic neurone releases neurotransmitters many times over a very short period to exceed the threshold potential and trigger an action potential.

Question 3

What is spatial summation

Answer 3

Multiple neuron synapses stimulate the postsynaptic neuron

Question 4

What is temporal summation

Answer 4

One neuron sends a high frequency of action potentials at once

Question 5

Parcinian corpsical

Answer 5

Has stretch mediated sodium ion channels, sensory neurone surrounded by tissue layers that detects mechanical pressure

Question 6

Cone cells

Answer 6

-3 types of pigment so can detect blue red and green light, high visual acuity, and sensitive to high light intensities, generates separate action potentials in separate sensory neurones

Question 7

Rod cells

Answer 7

1 type of pigment, so interpret all colours as shades of black and white, low visual acuity so only pick out rough shapes, but sensitive to low light sensitivities (allow eyes to see in dark), many rods connect to one sensory neurone so a single action potential is sent to the brain