HW 4 Flashcards


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1

Nerve impulses leading to the skeletal muscle carry information to direct movement. The nerve fibers sending these signals will mot likely belong to which division of the nervous system?

Somatic nervous system

2

The concentration of ions in the chemical environment surrounding the neurons must be tightly regulated for neurons to function properly. Which of the following ells is most responsible for this?

Astrocytes

3

The concentration neurotransmitters in the fluid of the synaptic cleft must be tightly regulated for neurons to function properly. Which of the following cells is most responsible for aiding in this regulation?

Astrocytes

4

Meningitis can be caused by infection of the central nervous system by bacteria. Which cells would be most responsible for removing the infection?

microglia

5

An action potential is regarded as an example of positive feedback. Which of the following examples below best illustrates the positive feedback aspect of an action potential?

A threshold stimulus will cause the opening of voltage gated sodium ion channels that will cause further depolarizing stimulus. This stimulus will open still more voltage gated sodium ion channels.

6

The depolarization phase of an action potential is punctuated by the closing of inactivation gates in the voltage gated sodium ion channels. All of the following are consequences of this inactivation except one. Choose the statement below that is not consequence of the closing of inactivating gates.

This allows for the efflux (diffusion out) of potassium ions, resulting in the repolarization of the cell.

7

During the relative refractory period of an action potential, a larger than normal stimulus is needed to cause another action potential. This is due to the fact that _____.

The voltage gated potassium ion channels remain open long enough to hyperpolarize the axon membrane

8

If a post synaptic cell is stimulated to threshold by temporal summation this implies that

A presynaptic neuron is sending frequent EPSP

9

When a neurotransmitter like acetylcholine is acting in an excitatory manner which of the following is likely a result of the acetylcholine acting on the post synaptic cell?

Chemically gated sodium channels will open.

10

When a neurotransmitter like GABA is anting in an inhibitory manner which of the following is likely a result of the GABA acting on the post synaptic cell?

Hyper-polarization of the postsynaptic cell membrane

11

Bacteria in the blood can be prevented entry to the fluids surrounding the brain. Which cells are most responsible for preventing bacteria from entering the fluids of the brain?

Astrocytes

12

Nerve impulses leading to the brain carry information about cool temperatures on the skin. The nerve fibers sending these signals will most likely belong to which division of the nervous system?

Sensory (afferent) divison

13

Which brain nucleus is the body's "biological clock"

suprachiasmatic nucleus

14

The primary auditory cortex is located in the _____.

temporal lobe

15

The brain stem consists of the _____.

midbrain, medulla and pons

16

Nuclei of cranial nerves V (trigeminal), VI (abducens), and VII (facial) are found in the _____

Pons

17

Which fissure separates the cerebral hemispheres?

Longitudinal fissure

18

A shallow groove on the surface of the cortex is called a _____.

Suclus

19

The central sulcus separates which lobes?

frontal from parietal

20

The frontal love is separated fro the temporal lobe by the ____.

Lateral sulucs

21

Broca's area _______>

is considered a motor speech area

22

The large commissure that connects the right and left sides of the brain is called the _____.

corpus callosum

23

What connects the hypothalamus to the pituitary gland?

infundibulum

24

The _____ nervous system controls the skeletal muscles.

somatic

25

Neurotransmitter for release is stored in the synaptic

vesicles

26

The site of intercellular communication between neurons is the

synapse

27

The axon is connected to the cell body at the

axon hillock

28

The most abundant class of neuron in the central nervous system is

multipolar

29

Neurons that have one axon and one dendrite, with the soma in between, are called

bipolar

30

Sensory neurons of the PNS are

unipolar