Chapter 1 In-Class Quiz Flashcards Preview

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Flashcards in Chapter 1 In-Class Quiz Deck (15):
1

The human brain contains approximately----- ------ individual neurons.

100 billion

2

A motor neuron ------- while a sensory neuron -------

Receives excitation from other neurons; is specialized at one end to be highly sensitive

3

The structures at the end of axons are the

Presynaptic buttons

4

What structure is composed of two layers of fat molecules that are free to flow around one another?

membrane

5

Santiago Ramon y Cajal demonstrated that

Neurons are separate from one another

6

The tree-like branches of a neuron that receive information from other neurons are called --------.

Dendrites

7

Glial cells -------.

are smaller but more numerous than neurons in the human brain

8

What type of glia helps to synchronize the activity of axons?

Astrocytes

9

What leads to Korsakoff's syndrome?

Thiamine deficiency due to chronic alcoholism

10

The resting potential is mainly the result of

Negatively charged proteins inside the cell

11

When a neuron's membrane is at rest, the concentration gradient tends to move sodium ----- the cell and the electrical gradient tends to move it ------ the cell.

Into;Into

12

When a neuron's membrane is at rest, the concentration gradient tends to move potassium ------- the cell and the electrical gradient tends to move it ------- the cell.

Out of; into

13

Water, Oxygen. and --------- most freely flow across a cell membrane.

Carbon dioxide

14

The concentration gradient refers to the --------.

difference in distribution for various ions between the inside and outside of the membrane

15

The primary feature of a neuron that prevents the action potential from traveling back from where it just passed is the --------------.

refractory period