Chapter 27

Question 1

The two major divisions of the nervous system are ______

Answer 1

The CNS (central nervous system) and the PNS (peripheral nervous system)

Question 2

The cells that carry electrical signals from one part of the body to another in the nervous system are called ______

Answer 2

Neurons

Question 3

Which of the following are part of the peripheral nervous system?

a. Sensory neuron and motor neuron
b. Interneuron neuron and motor neuron
c. Interneuron neuron and sensory neuron
d. Only interneurons

Answer 3

a. Sensory neuron and motor neuron

Question 4

Multiple sclerosis primarily involves ____

a. Destruction of the medulla oblongata
b. Deterioration of the corpus callosum
c. Destruction of regions of the cerebral cortex
d. Destruction of the myelin sheath

Answer 4

d. Destruction of the myelin sheath

Question 5

As you prepare to head off to class, you reach up to grab a pencil, but poke the tip of your finger. Quickly, and without thinking, you pull your hand back. Which of the following is the correct order sequence of neuronal action involved in this reflexive response?

a. Sensory neuron, interneuron, motor neuron
b. Sensory neuron, motor neuron, interneuron
c. Interneuron, sensory neuron, motor neuron
d. Motor neuron, sensory neuron, interneuron

Answer 5

a. Sensory neuron, interneuron, motor neuron

Question 6

Which of the following transmit signals to the synaptic terminal?

a. Dendrites
b. actin filaments
c. Axons
d. Myosin filaments

Answer 6

c. Axons

Question 7

The minimum change in a membrane’s voltage that must occur to trigger an action potential is the ______

Answer 7

Threshold

Question 8

What causes the inside of a membrane to become positively charged during an action potential?

Answer 8

Positively charged ions flooding in

Question 9

In a chemical synapse, what is the name of the gap between the transmitting and recieveing neurons?

Answer 9

Synaptic cleft

Question 10

Blocking receptors on dendrites of recieveing neurons will have the greatest impact on ______

a. Neurotransmitter exocytosis
b. Sodium ions binding
c. Sodium ions entering the cell
d. Neurotransmitter binding

Answer 10

d. Neurotransmitter binding

Question 11

Where would you expect to find electrical synapse?

a. Within skeletal muscles
b. Within the brain
c. Within the heart
d. Within the spinal cord

Answer 11

c. Within the heart

Question 12

The receptor potential is the _____
a. Membrane potential produced when a neurotransmitter molecule binds to its receptor
b. Membrane potential production the receptor cell by sensory transduction
c. Membrane potential produced by sensation
d, electrical signal produced by perception

Answer 12

b. Membrane potential production the receptor cell by sensory transduction

Question 13

Which of the following statements is true?

a. Rods can distinguish shades of grey
b. Cones are more sensitive to light than rods
c. Rods are most concentrated at the center of the retina
d. Cones are distributed along the out edge of the retina

Answer 13

a. Rods can distinguish shades of grey

Question 14

The blind spot of your eye is the result of

a. The presents of only rods where the optic nerve penetrates the retina
b. The presence of only cones where the optic nerve penetrates the retina
c. Extremely poor vision
d. The absence of rods and cones where the optic nerve penetrates the retina.

Answer 14

d. The absence of rods and cones where the optic nerve penetrates the retina.