Chapter 2 quiz

Question 1

Prior to the work of Santiago Ramon y Cajal, what did many investigators believe?

Answer 1

The tip of all axon physically merged w/the nxt neuron.

Question 2

The endoplasmic reticulum is a:

Answer 2

network of thin tubes that transport newly synthesized proteins.

Question 3

Dendrites often contain additional short outgrowths. These are believed to:

Answer 3

increase the surface area available for synapses.

Question 4

When a neurons’ membrane is @ rest, the concentration gradient tends to move sodium _____ the cell & the electrical gradient tends to move it ______ the cell

Answer 4

into; into

Question 5

After the peak of an action potential, what prevents sodium ions from continuing to enter the cell?

Answer 5

The sodium gates in the membrane close

Question 6

According to the all-or-nothing law:

Answer 6

Once an axon reaches threshold, the amplitude & velocity of an action potential are nearly equal each time.

Question 7

The Function of a myelin sheath is to:

Answer 7

increase the velocity of transmission along an axon.

Question 8

Which of the following describes the transmission of information in a local neuron?

Answer 8

The signal decreases in strength as it travels.