Chapter 12 Flashcards
Which of these components is usually absent from a neuron? centrioles dendrites axons cell body
centrioles
The afferent division of the PNS \_\_\_\_\_\_\_\_\_\_\_\_\_. carries motor commands carries sensory information controls skeletal muscle controls smooth muscle
carries sensory information
Which of the following is not a function of the nervous system?
control peripheral effectors
coordinate voluntary and involuntary activities
integrate sensory information
sense the internal and external environments
direct long-term functions, such as growth
direct long-term functions, such as growth
The \_\_\_\_\_\_\_\_ nervous system is composed of the brain and spinal cord. efferent afferent autonomic central peripheral
central
The \_\_\_\_\_\_\_\_ nervous system controls the skeletal muscles. parasympathetic somatic sympathetic autonomic afferent
somatic
The part of the peripheral nervous system that carries sensory information to the CNS is designated efferent. afferent. motor. somatic. autonomic.
afferent.
The efferent division of the peripheral nervous system innervates: heart muscle cells skeletal muscle cells glandular cells smooth muscle cells All of the answers are correct.
All of the answers are correct.
Which of these is not a neuron structural category? pseudopolar unipolar bipolar multipolar
pseudopolar
Most CNS neurons fall into which structural category? multipolar unipolar bipolar anaxonic
multipolar
The axon hillock connects the axon with the \_\_\_\_\_\_\_\_\_\_. synapse cell body (soma) telodendria collaterals
cell body (soma)
The axoplasm of the axon contains which of the following? neurotubules mitochondria neurofibrils vesicles All of the answers are correct.
All of the answers are correct.
Which of the following is not a recognized structural classification for neurons? anaxonic bipolar multipolar pseudopolar unipolar
pseudopolar
The most abundant class of neuron in the central nervous system is multipolar. unipolar. bipolar. pseudopolar. anaxonic.
multipolar.
The rabies virus travels to the CNS via subcutaneous connective tissue. cerebrospinal fluid. anterograde axoplasmic transport. blood vessels. retrograde axoplasmic transport.
retrograde axoplasmic transport.
The site of intercellular communication between a neuron and another cell is the collateral. synaptic terminals. telodendria. synapse. hillock.
synapse.
Neurons that are rare, small, and lack features that distinguish dendrites from axons are called bipolar. anaxonic. unipolar. tripolar. multipolar.
anaxonic.
Neurons in which dendritic and axonal processes are continuous and the soma lies off to one side are called tripolar. bipolar. unipolar. anaxonic. multipolar.
unipolar.
Neurons that have one axon and one dendrite, with the soma in between, are called bipolar. tripolar. unipolar. anaxonic. multipolar.
bipolar.
Neurons that have several dendrites and a single axon are called unipolar. anaxonic. bipolar. multipolar. tripolar.
multipolar.
\_\_\_\_\_\_\_\_ neurons are the most common class in the CNS. Unipolar Sensory Bipolar Anaxonic Multipolar
Multipolar
\_\_\_\_\_\_\_\_ neurons form the afferent division of the PNS. Visceral sensory Neural sensory Sensory Somatic sensory Motor
Sensory
What is contained inside the synaptic terminals? neuroglia calcium ions neurotransmitter molecules acetylcholinesterase sodium ions
neurotransmitter molecules
The basic functional unit of the nervous system is the ________.
neuron
The basic functional unit of the nervous system are cells called ________.
neurons