Question 1

The equilibrium potential for potassium ion occurs at approximately

Accepted Answer

A) -90 mV. 
B) -70 mV. 
C) +66 mV. 
D) 0 mV. 
E) +30 mV. 
A) -90 mV. 
B) -70 mV. 
C) +66 mV. 
D) 0 mV. 
E) +30 mV.

Question 2

Graded potentials

Accepted Answer

A) produce an effect that increases with distance from the point of stimulation. 
B) produce an effect that spreads actively across the membrane surface. 
C) may be either a depolarization or a hyperpolarization. 
D) are often all-or-none. 
E) cause repolarization. 
A) produce an effect that increases with distance from the point of stimulation. 
B) produce an effect that spreads actively across the membrane surface. 
C) may be either a depolarization or a hyperpolarization. 
D) are often all-or-none. 
E) cause repolarization.

Question 3

EPSPs (excitatory postsynaptic potentials)occur when

Accepted Answer

A) more potassium ions than usual leak out of a cell. 
B) more calcium ions than usual leak out of a cell. 
C) chloride ions enter a cell. 
D) extra sodium ions enter a cell. 
E) hyperpolarizations occur. 
A) more potassium ions than usual leak out of a cell. 
B) more calcium ions than usual leak out of a cell. 
C) chloride ions enter a cell. 
D) extra sodium ions enter a cell. 
E) hyperpolarizations occur.

Question 4

In which of the following would the rate of impulse conduction be the greatest?

Accepted Answer

A) a myelinated fiber of 10-µm diameter 
B) a nonmyelinated fiber of 20-µm diameter 
C) a myelinated fiber of 1-µm diameter 
D) a nonmyelinated fiber of 10-µm diameter 
E) the same in all because of the all-or-none principle 
A) a myelinated fiber of 10-µm diameter 
B) a nonmyelinated fiber of 20-µm diameter 
C) a myelinated fiber of 1-µm diameter 
D) a nonmyelinated fiber of 10-µm diameter 
E) the same in all because of the all-or-none principle

Question 5

The efferent division of the peripheral nervous system innervates:

Accepted Answer

A) skeletal muscle cells 
B) smooth muscle cells 
C) heart muscle cells 
D) glandular cells 
E) All of the answers are correct. 
A) skeletal muscle cells 
B) smooth muscle cells 
C) heart muscle cells 
D) glandular cells 
E) All of the answers are correct.

Question 6

When pressure is applied to neural tissue,all these effects are possible,except

Accepted Answer

A) a decrease in blood flow. 
B) a decrease in available oxygen. 
C) action potentials are generated spontaneously. 
D) glial cells degenerate. 
E) neurons are triggered to divide. 
A) a decrease in blood flow. 
B) a decrease in available oxygen. 
C) action potentials are generated spontaneously. 
D) glial cells degenerate. 
E) neurons are triggered to divide.

Question 7

Which of the following is not involved in creating the resting potential of a neuron?

Accepted Answer

A) diffusion of potassium ions out of the cell 
B) diffusion of sodium ions into the cell 
C) membrane permeability for sodium ions greater than potassium ions 
D) membrane permeability for potassium ions greater than sodium ions 
E) The interior of the plasma membrane has an excess of negative charges. 
A) diffusion of potassium ions out of the cell 
B) diffusion of sodium ions into the cell 
C) membrane permeability for sodium ions greater than potassium ions 
D) membrane permeability for potassium ions greater than sodium ions 
E) The interior of the plasma membrane has an excess of negative charges.

Question 8

Regions of the CNS with an abundance of myelinated axons constitute the ________ matter.

Accepted Answer

The answer of Regions of the CNS with an abundance...

Question 9

Which of the following is true about threshold for an action potential?

Accepted Answer

A) It is more positive than the resting potential. 
B) Voltage-gated potassium channels begin to close. 
C) Voltage-gated potassium channels begin to open. 
D) The membrane begins to hyperpolarize. 
E) Threshold for a typical neuron is approximately -30 mV. 
A) It is more positive than the resting potential. 
B) Voltage-gated potassium channels begin to close. 
C) Voltage-gated potassium channels begin to open. 
D) The membrane begins to hyperpolarize. 
E) Threshold for a typical neuron is approximately -30 mV.

Question 10

The ________ nervous system provides involuntary regulation of smooth muscle,cardiac muscle,and glandular activity.

Accepted Answer

The answer of The ________ nervous system provides involuntary regulation...

Question 11

________ open or close in response to binding specific molecules.

Accepted Answer

A) Leak channels 
B) Activated channels 
C) Chemically-gated channels 
D) Voltage-gated channels 
E) Voltage-gated and chemically-gated channels 
A) Leak channels 
B) Activated channels 
C) Chemically-gated channels 
D) Voltage-gated channels 
E) Voltage-gated and chemically-gated channels

Question 12

After acetylcholinesterase acts,the synaptic terminal

Accepted Answer

A) reabsorbs the acetylcholine. 
B) reabsorbs the acetate. 
C) reabsorbs the choline. 
D) reabsorbs axoplasm. 
E) pinches off and a new terminal grows. 
A) reabsorbs the acetylcholine. 
B) reabsorbs the acetate. 
C) reabsorbs the choline. 
D) reabsorbs axoplasm. 
E) pinches off and a new terminal grows.

Question 13

Which of the following statements about the action potential is false?

Accepted Answer

A) The rapid depolarization phase is caused by the entry of potassium ions. 
B) During the repolarization phase,sodium channels close and potassium channels open. 
C) During the depolarization phase,membrane potential becomes positive. 
D) In the after-hyperpolarization phase,membrane potential approaches the potassium equilibrium potential. 
E) Repolarization occurs as potassium ions leave the axon. 
A) The rapid depolarization phase is caused by the entry of potassium ions. 
B) During the repolarization phase,sodium channels close and potassium channels open. 
C) During the depolarization phase,membrane potential becomes positive. 
D) In the after-hyperpolarization phase,membrane potential approaches the potassium equilibrium potential. 
E) Repolarization occurs as potassium ions leave the axon.

Question 14

Most neurons lack ________ and so are permanently blocked from undergoing cell division.

Accepted Answer

The answer of Most neurons lack ________ and so are...

Question 15

If acetylcholine (ACh)causes inhibition of a postsynaptic neuron,to what type of membrane channel did the ACh bind?

Accepted Answer

A) mechanically-regulated channel 
B) voltage-regulated sodium channel 
C) voltage-regulated calcium channel 
D) chemically-regulated potassium channel 
E) chemically-regulated sodium channel 
A) mechanically-regulated channel 
B) voltage-regulated sodium channel 
C) voltage-regulated calcium channel 
D) chemically-regulated potassium channel 
E) chemically-regulated sodium channel

Question 16

A stimulus that changes a postsynaptic neuron's membrane from resting potential to -85 mV is:

Accepted Answer

A) an excitatory stimulus 
B) a depolarizing stimulus 
C) a temporal stimulus 
D) a saltatory stimulus 
E) an inhibitory stimulus 
A) an excitatory stimulus 
B) a depolarizing stimulus 
C) a temporal stimulus 
D) a saltatory stimulus 
E) an inhibitory stimulus

Question 17

Figure 12-2 The Nerve Action Potential
Use Figure 12-2 to answer the following questions:
-When is the neuron in the refractory period?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 18

The site in the neuron where EPSPs and IPSPs are integrated is the

Accepted Answer

A) chemical synapse. 
B) electrical synapse. 
C) axon hillock. 
D) dendritic membrane. 
E) synaptic terminal. 
A) chemical synapse. 
B) electrical synapse. 
C) axon hillock. 
D) dendritic membrane. 
E) synaptic terminal.

Question 19

Voltage-gated channels are present

Accepted Answer

A) at the motor end plate. 
B) on the surface of dendrites. 
C) in the membrane that covers axons. 
D) on the soma of neurons. 
E) along the perikaryon of neurons. 
A) at the motor end plate. 
B) on the surface of dendrites. 
C) in the membrane that covers axons. 
D) on the soma of neurons. 
E) along the perikaryon of neurons.

Question 20

Small,wandering cells that engulf cell debris and pathogens in the CNS are called

Accepted Answer

A) astrocytes. 
B) satellite cells. 
C) oligodendrocytes. 
D) microglia. 
E) ependymal cells. 
A) astrocytes. 
B) satellite cells. 
C) oligodendrocytes. 
D) microglia. 
E) ependymal cells.

Exam 12: Neural Tissue

The equilibrium potential for potassium ion occurs at approximately

Graded potentials

EPSPs (excitatory postsynaptic potentials)occur when

In which of the following would the rate of impulse conduction be the greatest?

The efferent division of the peripheral nervous system innervates:

When pressure is applied to neural tissue,all these effects are possible,except

Which of the following is not involved in creating the resting potential of a neuron?

Regions of the CNS with an abundance of myelinated axons constitute the ________ matter.

Which of the following is true about threshold for an action potential?

The ________ nervous system provides involuntary regulation of smooth muscle,cardiac muscle,and glandular activity.

________ open or close in response to binding specific molecules.

After acetylcholinesterase acts,the synaptic terminal

Which of the following statements about the action potential is false?

Most neurons lack ________ and so are permanently blocked from undergoing cell division.

If acetylcholine (ACh)causes inhibition of a postsynaptic neuron,to what type of membrane channel did the ACh bind?

A stimulus that changes a postsynaptic neuron's membrane from resting potential to -85 mV is:

Figure 12-2 The Nerve Action Potential Use Figure 12-2 to answer the following questions: -When is the neuron in the refractory period?

The site in the neuron where EPSPs and IPSPs are integrated is the

Voltage-gated channels are present

Small,wandering cells that engulf cell debris and pathogens in the CNS are called

An Introduction to Anatomy and Physiology

The Chemical Level of Organization

The Cellular Level of Organization

The Tissue Level of Organization

The Integumentary System

Osseous Tissue and Bone Structure

The Axial Skeleton

The Appendicular Skeleton

Articulations

Muscle Tissue

The Muscular System

The Spinal Cord, spinal Nerves, and Spinal Reflexes

The Brain and Cranial Nerves

Neural Integration I: Sensory Pathways and the Somatic Nervous System

Neural Integration Ii: the Autonomic Nervous System and

The Special Senses

The Endocrine System

Blood

The Heart

Blood Vessels and Circulation

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism and Energetics

The Urinary System

Fluid, electrolyte, and Acid-Base Balance

The Reproductive System

Development and Inheritance

Filters

$Figure 12-2 The Nerve Action Potential Use Figure 12-2 to answer the following questions: -When is the neuron in the refractory period?$ Figure 12-2 The Nerve Action Potential Use Figure 12-2 to answer the following questions: -When is the neuron in the refractory period?