Neurons and the nervous system

Question 1

what is a neuron

Answer 1

nerve cells that transfer info through the body

Question 2

long distance

Answer 2

electrical signals

Question 3

short distnce

Answer 3

chemical signals

Question 4

what is the flow of signals

Answer 4

presynaptic to postsynaptic

Question 5

presynaptic cell

Answer 5

a neuron

Question 6

postsynaptic cell

Answer 6

a neuron, muscle, or gland cell

Question 7

cell body

Answer 7

the cells life support system

Question 8

dendrites

Answer 8

receives messages from other cells

Question 9

axon

Answer 9

passes messages away from the cell body

Question 10

myelin sheath

Answer 10

covers axon of some neurons and helps speed neural impulses

Question 11

axon terminals

Answer 11

form junctions with other cells

Question 12

neural impulse

Answer 12

electrical signal traveling down the axon

Question 13

membrane potential

Answer 13

a voltage (difference in electrical charge) across its plasma membrane

Question 14

resting potential

Answer 14

the membrane potential of a neuron not sending signals

Question 15

what are changes within membrane potential

Answer 15

signals, transmitting and processing information

Question 16

In a mammalian neuron at resting potential what is the concentration of K+ and Na+

Answer 16

K+ is highest inside the cell, while the concentration of Na+ is highest outside the cell