Nervous System And Sense Organs Flashcards
Nerve tissue:
a) is developed from embryonic ectoderm
b) neurons have the capacity to divide by mitosis
c) only microglia has the capacity to divide by mitosis
d) peripheral nerve fibres can regenerate if their perikaryons are not destroyed
A,d
Types of neurons based on their processes:
a) pseudounipolar
b) multipolar
c) pseudobipolar
d) bipolar
A,b,d
Mark the correct answers about perikaryons:
a) it is a nuclear envelope
b) contains nucleus and surrounding cytoplasm exclusive of the cell processes
c) contains nucleus and surrounding cytoplasm inclusive axon
d) is is a trophic center of neuron
B,d
Mark the correct answers about neurons:
a) the most of cells have nucleus with prominent nucleolus
b) there are typical features of intense synthetic activity
c) Golgi complex is located also in cell processes
d) there is smooth endoplasmic reticulum called Nissl bodies in the perikaryon
A,b
Mark the correct answers about neurons:
a) Nissl bodies is the term for rough endoplasmic reticulum and free ribosomes
b) nerve cells can contain lipofuscin
c) there is small nucleus with processes
d) nerve cells can contain centrosomes
A,b
What is the origin of nerve tissue?
a) endodermal
b) ectodermal
c) mesodermal
d) mesenchymal
B
Mark the correct answers about nerve tissue:
a) initial segment can be found by unmyelinated axons
b) there is a rough endoplasmic reticulum in axoplasm
c) axonal cytoplasm possesses mitochondria
d) retrograde flow along the axon is used to study the pathways of neurons
C,d
Several types of synapses are presented in nerve tissue. Mark the correct answers:
a) axosomatic
b) axoaxonic
c) dendrodendritic
d) axodendritic
A,b,d
Several types of glial cells are presented in nerve tissue. Mark the correct answers:
a) ependymal cells
b) astrocytes
c) Schwann cells
d) microglia
A,b,c,d
Astrocytes:
a) are star-shaped cells
b) fibrous astrocytes are located in the white matter
c) participate in controlling the ionic environment of neurons
d) have macrophagic activity
A,b,c
Mark the correct answers about glial cells:
a) astrocytes participate in blood-brain barrier
b) microglia are derived from precursor cells in the bone marrow
c) ependymal cells are squamous epithelial cells
d) oligodendrocytes produce the myelin sheet
A,b,d
Oligodendrocytes:
a) ne oligodendrocyte formed myelin sheet for only one axon
b) are located in central nervous system
c) have macrophagic activity
d) are star-shaped cells
B
Microglia cells
a) have macrophagic activity
b) form myelin sheet
c) secrete immunoregulatory cytokines
d) are the columnar epithelial cells lining the ventricles
A,c
Ependymal cells
a) are low columnar epithelial cells
b) line the ventricles of the brain
c) line the central canal of the spinal chord
d) are ciliated in some locations
A,b,c,d
Mark the correct answer:
a) Schwann cells produce myelin sheet of axons in the central nervous system
b) myelin is a whitish lipoprotein complex
c) myelin consists of many layers of modified cell membranes
d) internode consist of one Schwann cell
B,c,d
