Lecture 3 Exam: TRUE / FALSE QUESTIONS

The descending tracts deliver afferent or sensory impulses from the brain to the spinal cord

False (Ascending tracts are responsible for afferent or sensory impulses)

The multipolar neurons have two processes an axon and a long dendrite that extend from the cell body

False (Bipolar neurons have two processes (axon and dendrite) that extend from two opposite sides of the cell body)

The dorsal root of the spinal cord contains efferent neurons

False (Dorsal root contains afferent or sensory neurons)

Schwann cells produce Cerebrospinal Fluid in the CNS.

False (Ependymal cells produce CFS)

The functional purpose of the myelin sheath is to regenerate severed or crushed neurons

False (Neurilemma of the Schwann cell is responsible for forming a regeneration tube, that guide the regeneration of the axon)

Schwann cells are a type of neuroglial cells found in the Central Nervous System.

False (Neurolemmocytes are found in the Peripheral Nervous System)

Oligodendrocytes produce myelin sheath in the Peripheral Nervous System

False (Neurolemmocytes produce myelin sheaths in the Peripheral Nervous System)

Oligodendrocytes, a type of neuron, produces myelin sheath in the Central Nervous System

False (Oligodendrocytes are a type of neuroglial cell that produces myelin sheath in the CNS)

One of the effectors of the somatic afferent neurons are skeletal muscles

False (Skeletal muscles are effected by efferent somatic neurons)

The autonomic nervous system is subdivided into the Central and Peripheral Nervous Systems

False (The ANS is subdivided into the Sympathetic and Parasympathetic Nervous Systems)

Graded potentials can act as signals only over very short distances. Nonetheless, they are essential in initiating the action-potentials (the long-distance signals).

True

The two cell types that make-up nervous tissue are neurons and neuroglial or glial cells (Astrocytes, Microglia, Ependymal, Oligodendrocytes, Satellite, and Schwann cells).

True (Because neurons are the structural units while glial cells provide a supportive, scaffolding for neurons)

Inferiorly the spinal cord ends at the conus medullaris between L1 and L3

True (Because the spinal cord is absent in this area it is ideal for lumbar puncture)

Another term used for substances that are excreted from the synaptic end bulbs are called biogenic amines.

True (Biogenic amines is another term used for neurotransmitters)

Dendrites do not release neurotransmitters

True (Dendrites receive neurotransmitters)

A neurotransmitter causes the Ligand-gated ion channel to open or close

True (Ligand-gated channels open when the appropriate chemical (neurotransmitter)

The functional purpose of the Nodes of Ranvier is Saltatory Conduction

True (Saltatory conduction allows the signal to jump from none to node in myelinated neurons)

The CNS (spinal cord and brain) contain sensory (afferent), motor (efferent), and association neurons

True (mixed nerves are located in the CNS)