L4 - Basic Neuroscience

Question 1

Outline the Knee-Jerk Reflex

Answer 1

Muscle Spindle in Quad –> Spinal Cord –> Excitiation to quad and inhibition to hamstring

Question 2

What is the Nernst Equation?

Answer 2

Ek=Rt/zF log ([X]out/[X]in)

Question 3

What is the Nernst potential of calcium?

Answer 3

+150mV

Question 4

What is the Nernst potential of sodium?

Answer 4

+70mV

Question 5

What is the Nenst potential of chloride?

Answer 5

-30 to -65mV

Question 6

What is the Nernst potential for potassium?

Answer 6

-98mV

Question 7

Who recorded the first APs?

Answer 7

Grasser and Erlanger

Question 8

What is the equation for the timer constant?

Answer 8

t=RmCm

Question 9

What is the equation for the lenght constant?

Answer 9

Rm/Cm

Question 10

What are the active properties of a signal?

Answer 10

Remains constant over distance
AP requires both passive and active flow
Saltatory coonduction in a myelinated axon

Question 11

What does an alpha type fibre do?

Answer 11

Innervate extrafusal muscle fibres

Question 12

What does a gamma type fibre do?

Answer 12

Innervate intrafusal muscle fibres

Question 13

What does a type 1a fibre do?

Answer 13

Proprioception

Question 14

What does a type 1b fibre do?

Answer 14

Golgi tendon organ

Question 15

What does a type II fibre do?

Answer 15

Secondary receptors of the muscle spindle and all cutaneous mechanoceptors

Question 16

What is a type II fiber

Answer 16

Free endings of touch and pressure, nociceptors and cold thermoceptors

Question 17

What is a type C fibre?

Answer 17

Nociceptor and Warmth receptor