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BIS 240

Terms in this set (42)

Which of the following is (are)components of the nervous system?
-brain, cranial nerves(their branches too), spinal cord, spinal nerves (their branches), ganglia, enteric plexuses, and sensory receptors
A nerve is a structure that may contain the following except:
a.axons
b.blood vessels
c.neuron cell bodies
d.connective tissue
e.myelin
-neuron cell bodies
A _____ refers to a small mass of nervous tissue, consisting primarily of neuron cell bodies, outside of the brain and spinal cord.
-ganglion
____(or motor)impulses travel from the __to the ___ (muscle to glands).
-efferent, central nervous system, effectors
The peripheral nervous system carriers___(or sensory)impulses from the ___to the ____?
-Afferent, receptors, central nervous system (CNS)
The peripheral nervous system consists of:
a) cranial nerves and their branches.
b) spinal nerves and their branches.
c)somatic neurons system and autonomic nervous system
d) all of these choices
-all of the above
Which of the following convey information from the central nervous system (CNS)to skeletal muscle only?
-somatic motor neurons
The efferent portion of the autonomic nervous system consists of the sympathetic and parasympathetic division?
true or false?
-true
The main difference between neurons and neuroglia is?
-mature neurons do not normally divide; neuroglia do.
The axon hillock is the part of a neuron that:
-connects the axon to the neuron cell body
Select the best description of dendrites?
-usually short and branched
Select the best description if nissl bodies?
-rough endoplasmic reticulum
Select the best description of axon terminals:
-fine processes at the ends of axons
At a synapse between the axon of one cell and the dendrite of another cell, the axon would always be part of a ___neuron; the dendrites would always be part of a ___neuron.
-presynaptic, postsynaptic
The vast majority of neurons in the body are interneurons?
true or false?
true
-Oligodendrocytes:
they produce myelin sheath around several adjacent axons of the CNS neurons
-astrocytes:
they are star-shaped and one of their function is providing nutrients to neurons
-microglia:
they are small cells with few processed and they protect CNS from disease by engulfing invading microbes
-ependymal cells
many of them are ciliated; they line ventricles of the brain and central canal of the spinal cord
Select the best description of Shawn cells (neurolemmocytes)?
-forms myelin sheath in the PNS
Dendrites conduct signals toward the neuron's cell body; the axon conducts nerve impulses away from the neuron cell body?
-true
when compared to unmyelinated axons, myelinated axons:
1. are electrically insulated
2. are gray in color
3. have a faster speed of nerve impulse conduction
4. are more numerous
-1,3,4 only
.skeletal muscle fiber (cells)have the following anatomical characteristic (s)
-numerous nuclei
most unipolar neurons are sensory neurons that transmi information along afferent pathways to the central nervous system?
-true
white matter includes:
-tracts in spinal cord
gray matter consist of the following except :
-aggregation of myelinated axons
which of the following muscle tissue shows the straiton and autorhythmicity ?
-cardiac muscle tissue
The dense layer of collagen fibers that surround an entire skeletal muscle is ?
-epimysium
match the following :
-the cell memebrane of skeletal muscle is called the:
sarcolemma
the functional unit of the skeletal muscle fiber is the :
sacromere
the sacs that surround each myofibrils and store calcium are the:
Sarcoplasmic Reticulum
the close assiocation of terminal cristaens of sacroplasmic reticulum and transverse (T) tubules is called a
triad
which of the following segment contains thick filament only?
-H zone
28.the light area of the sarcomere that contains only thin filaments is the?
-I band
during contraction ,____are unchanged in length,while ____shorten?
-thick and thin filaments,I band and H zone
.which of the following is not a component of thin filaments?
A.myosin -
B.actin
C.tropoin
D.tropomyosin
E.both a and d
myosin
place the following in correct order (from the smallest to the largest):
1.a muscle 2.muscle fibers 3.myofibrils 4.filaments 5.fasicles
-4,3,2,5,1 (filaments,myofibrils,muscle fibers,fasicles,a muscle)
A motor neuron together with all the skeletal muscle fibers it stimulates is called a motor unit .
true
neurotranmitter receptor are found where on the sarcolemma?
-motor end plate
place the following events in the correct order:
1.ACh is released by exocytosis into the synaptic cleft
2.A muscle action potential is triggered
3.An action potential reaches the synaptic end bulbs
4.ACh binds to protein receptors of motor end plate
(3,1,4,2)
place the following events in correct order :
1.pulling thin fliaments toward the center of a sacromere
2.binding of the cross-bridges of myosin head to actin
3.releasing of calcium ions from the SR
4.Z disc come close together and sarcomere shortens
(1,2,4,3)
Ordinarily,the insertion of a muscle:
1.limb is proximal to the orgin
2.does not move when the muscle contracts
3.is the movable point of attachment of a muscle
4.attaches a muscle to bone or skin
(3 and 4 only)
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