(1) cardiac muscle cells can divide (2) the cardiac muscle lacks capacity
for reparative
regeneration (3) minor wounds heal by new muscle cell production (4) any defect is closed
by connective tissue scar
7. NERVOUS TISSUE
Directions
: each of the following statements contains five suggested completions. Choose
the one that is best in each case.
1. The following organelles are plentiful in the neuron cytoplasm, EXCEPT:
A
– Golgi apparatus; B – mitochondria; C – microtubules and microfilaments; D –
centrioles; E
– rER.
2. Nissl bodies seen by light microscopy as basophilic clumps are:
A
– sER; B – Golgi apparatus; C – mitochondria; D – microtubules; E – rosettes of
polysomes and rER.
3. The neurofibrils seen by light microscopy are the fixation artefact and represent
aggregated
:
A
– mitochondria; B – Golgi apparatus; C – microtubules and microfilaments; D – rER; E –
sER.
4. Each of the following statements concerning the axon is true, EXCEPT:
A
– lacks rER and polysomes; B – lacks mitochondria; C – contains many microtubules; D
– demonstrates axonal transport; E – conducts impulses away from the soma.
5. Each of the following statements concerning the synapses is true, EXCEPT:
A
– transfer impulses from one neuron to another; B – are chemical and electrical; C –
interact with stimuli and generate nervous impulses; D
– are axodendritic, axosomatic, and
axoaxonic; E
– may be exciting and inhibitory.
6. Each of the following statements concerning the chemical synapse is true,
EXCEPT:
A
– its presynapse contains vesicles with a neurotransmitter; B – its presynaptic
membrane is thickened; C
– its postsynaptic membrane has receptors; D – has a synaptic
cleft; E
– lacks glial cells.
7. The following glial cells belong to the macroglia, EXCEPT:
A
– oligodendrocytes; B – protoplasmic astrocytes; C – glial microphagocytes; D – fibrous
astrocytes; E
– ependymal cells.
8. The glial cells arising from the blood monocytes are:
A
– microglia; B – oligodendrocytes; C – protoplasmic astrocytes; D – fibrous astrocytes; E
– ependymal cells.
9. The glial cells lining the brain ventricles and the spinal canal are:
A
– microglia; B – oligodendrocytes; C – protoplasmic astrocytes; D – fibrous astrocytes; E
– ependymal cells.
10. The glial cells forming sheaths around neuronal processes in the nerve fibres
are:
A
– protoplasmic astrocytes; B – fibrous astrocytes; C – microglia; D – oligodendrocytes
(lemmocytes); E
– ependymal cells.
11. Each of the following statements concerning the myelinated fibres is true,
EXCEPT:
A
– their outer sheath is neurilemma; B – contain several axis cylinders; C – their inner
sheath is myelinated; D
– conduct impulses at a rate of 80 to120 m/s; E – possess nodes
of Ranvier.
12. Each of the following statements concerning the myelinated sheath is true,
EXCEPT: