Chapter 4 Part 1 Quiz

Question 1

Roberto Garcia d’Orta referred to himself as “a great lizard frozen in a dark, cold, strange world.” He suffered from ______

Answer 1

Parkinson’s disease

Question 2

Tremor-at-rest is a symptom of _______

Answer 2

Parkinson’s disease

Question 3

Microelectrodes are required to record a neuron’s resting ______

Answer 3

Potential

Question 4

The ______ is about -70 mV

Answer 4

Resting potential

Question 5

In its resting state, a neuron is said to be _____.

Answer 5

Polarized

Question 6

Two factors pressure Na+ ions to enter resting neurons: random _______ and electrostatic pressure.

Answer 6

Motion

Question 7

In the resting state, there is a greater concentration of Na+ ions ______ the neuron than ______ the neuron.

Answer 7

Outside, inside

Question 8

Natrium is Latin for _______.

Answer 8

Sodium

Question 9

Ions pass through neural membranes via specialized pores called _______.

Answer 9

Ion channels

Question 10

From their studies, Hodgkin and Huxley inferred the existence of _______ in neural membranes, the first neural transporters to be discovered.

Answer 10

Sodium-potassium pumps

Question 11

Neurotransmitters typically have one of two effects on postsynaptic neurons: they either depolarize them or ______ them.

Answer 11

Hyperpolarize

Question 12

Postsynaptic depolarizations are commonly referred to in their abbreviated form: _________

Answer 12

EPSP’s

Question 13

Action potentials are generated in the axon initial segment, which is adjacent to the axon ______.

Answer 13

Hillock

Question 14

An action potential is elicited when the depolarization of the neuron reaches the ______.

Answer 14

Threshold of excitation

Question 15

Unlike postsynaptic potentials, which are graded, action potentials are _____ responses.

Answer 15

All-or-none

Question 16

Neurons integrate postsynaptic potentials in two ways: through spatial summation and through ________ summation.

Answer 16

Temporal