LAB QUIZ 5 (HW 3)

This functional neuron type is structurally a multipolar neuron. (a) Interneuron (b) Sensory

(a) Interneuron

This neuron type has cell bodies that are in the spinal cord (CNS). (a) Interneuron (b) Sensory

(a) Interneuron

This functional neuron type is structurally a multipolar neuron. (a) Motor (b) Sensory

(a) Motor

This neuron type has cell bodies that are in the spinal cord (CNS). (a) Motor (b) Sensory

(a) Motor

Which of the following statements is false? (a) Oligodendrocytes in the PNS and Schwann cells in the CNS produce the myelin sheaths. (b) Gaps in myelin sheaths are called nodes of Ranvier. (c) Myelin sheaths increase the speed of nerve impulse transmission. (d) The myelin sheath provides protection and insulation for the axon.

(a) Oligodendrocytes in the PNS and Schwann cells in the CNS produce the myelin sheaths.

T/F: Astrocytes and microglia cells work together to form a blood-brain barrier.

False

Which of the following correctly describes dendrites? (a) They receive information from receptors or other neurons. (b) They generate the axon potential. (c) They are found only in the CNS. (d) They are found only in the PNS.

(a) They receive information from receptors or other neurons.

The function of oligodendrocytes is to __________. (a) form myelin sheaths in the CNS (b) are phagocytic (c) are located in CNS ganglia (d) form myelin sheaths in the PNS

(a) form myelin sheaths in the CNS

Astrocytes function as __________. (a) guides for young neurons during development (b) phagocytes in the PNS (c) phagocytes in the CNS (d) producers of cerebrospinal fluid

(a) guides for young neurons during development

The myelin sheath is composed of __________. (a) lipids and protein (b) lipids only (c) protein only

(a) lipids and protein

Isolated areas of gray matter in the brain are called _________. (a) nuclei (b) nodes (c) synapses

(a) nuclei

Which neuron type has two cell processes? (a) Multipolar (b) Bipolar (c) Unipolar

(b) Bipolar

This neuron structure receives information from receptors or other neurons. (a) Axon (b) Dendrite (c) Cell body

(b) Dendrite

Which nerve fibers carry impulses from the CNS to skeletal muscles? (a) Afferent (b) Efferent (c) Association (d) Both Efferent and Afferent

(b) Efferent

This neuron is rare and is the sensory neuron in the eye and nose. (a) Unipolar (b) Multipolar (c) Bipolar

(c) Bipolar

Which of the following is a component of the CNS? (a) Efferent motor neurons (b) Sensory receptors and sensory neurons (c) Brain and spinal cord

(c) Brain and spinal cord

Which of the following has one short process that extends from the cell body and divides? (a) Multipolar (b) Bipolar (c) Unipolar

(c) Unipolar

Gray matter contains _________. (a) neuron cell bodies only (b) myelinated axons (c) neuron cell bodies, dendrites, axon terminals, and neuroglia (d) neuroglia only

(c) neuron cell bodies, dendrites, axon terminals, and neuroglia

The structural and functional units of the nervous system are the _______. (a) Microglia (b) Schwann cells (c) Ependymal cells (d) Neurons

(d) Neurons

The neuroglial cells that produce the myelin sheaths are __________. (a) Microglia and Schwann cells (b) Ranvier cells (c) Neurolemmacytes (d) Oligodendrocytes and Schwann cells

(d) Oligodendrocytes and Schwann cells

If you touch a hot stove with your hand, what sends a signal of pain to the CNS? (a) Both Effectors and Efferents are correct (b) Effectors (c) Efferents (d) Receptors

(d) Receptors

Which of the following are types of supporting cells of the PNS? (a) Oligodendrocytes and microglia (b) Oligodendrocytes and satellite cells (c) Microglia and Schwann cells (d) Satellite cells and Schwann cells

(d) Satellite cells and Schwann cells

The neuroglia cells that regulate the chemical environment of neurons are ____________. (a) ependymal cells (b) microglia (c) oligodendrocytes (d) astrocytes

(d) astrocytes

Which nerve fibers carry impulses from sensory receptors in the hand to the CNS when you touch a hot stove? 1. Afferent 2. Efferent 3. Peripheral

1. Afferent 3. Peripheral

T/F: Both neurons and neuroglia cells generate nerve impulses.

False

T/F: Microglia line the cavities of brain and spinal cord. They form and move CSF.

False

T/F: Neuroglia generate and transmit nerve impulses.

False

T/F: Schwann cells surround sensory neuron cell bodies located in ganglia in the PNS.

False

TF: Oligodendrocytes decrease the speed of nerve impulses.

False

T/F: A sensory neuron is structurally either a unipolar neuron or bipolar neuron whose cell body is found in the PNS.

True

T/F: Afferent nerve fibers are part of the Peripheral Nervous System (PNS).

True

T/F: Ependymal cells line brain ventricles and form cerebral spinal fluid.

True

T/F: Microglia are the phagocytic cells of the CNS.

True