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Hondros Bio 253 exam 2 Questions and Complete Solutions Graded A+.
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BIO 253 - Exam 1 Questions with Complete Solutions Graded A+Denning Muriithi [Date] [Course title] brils (budles of
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Hondros Bio 253 exam 2
.Neurons (Chapter 18) Correct Ans: Communicating Cells
2.Cell body Correct Ans: -contains ribosomes, rough endoplasmic er, Golgi
ap
-Neurotransmitters are packaged into vesticles
-provide proteins for nerve fibers
3.Axon Correct Ans: - each neuron has 1 axon
-carries impulses to target cells
4.Axon Hillock Correct Ans: Integrates incoming signals
5.Cytoskeleton Correct Ans: -microtubules of microfilaments, as well as neurofi neufilaments)
-allows transport of small organelles
6.Classifications of neurons Correct Ans: -Multipolar (motor are typically mult Bipolar(rare, think of retina)
Unipolar(pseudounipolar)(sensory are usually unipolar
7.Neurons have a limited capacity to repair themselves Correct Ans: -If the damage is not extensive, the cell body and the neurilemma are intact, and scarring has not occurred than nerve fibers can be repaired
8.Stages of neuron repair Correct Ans: -after injury distal portion of the axon and myelin sheath degenerate
-Macrophages remove debris
-remaining neurilemma and endoneurium form a tunnel from the point
of injury to the effector
-new Shawanna cells can grow in the tunnel to maintain a path of regrowth for the axon
9.Glia Correct Ans: The supporting cells of the central nervous system / 5 typ li
a
Ranvie
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s
Hondros Bio 253 exam 2
.Oligodendrocytes Correct Ans: -smaller than astrocytes and have fewer
pro
-hold the nerve fibers together
-producer the myelin sheath
14.Neuroglia Correct Ans: Schwann Cells Correct Ans: -Found only in Peripheral neurons
-Supportive nerve fibers and form the myelin sheaths
15.Myelin sheaths Correct Ans: -gaps between the segments and the Nodes of
-Made is segments by glia cells
16.oligodendrocytes Correct Ans: located in the CNS
17.Schwann Cells Correct Ans: Located in the PNS
18.central nervous system Correct Ans: -consists of the brain and spinal cor
-structural and center of the entire nervous system
-Main function is evaluation
Astrocytes Correct Ans: -Starshaped, Largest and most numerous type of g
-cell extensions connect to neurons and capillaries
-transfers the nutrients from the blood to the neuron.
-helps form and operate synapse
Microglia Correct Ans: -small usually stationary cells
-phagocytes
12. Ependymal cells Correct Ans: -lined fluid filled cavities in the CNS
-make and circulate Cerebrospinal fluid matic integra-
e effect
nterneuron
->od
y
Hondros Bio 253 exam 2
.Afferent Division Correct Ans: (sensory) brings signals into the CNS
-consist of all incoming pathways
21.somatic sensory division Correct Ans: carries feedback information to the so tion center in the CNS.
-these include the skin muscles and joints
22.Efferent Division Correct Ans: (motor)- carries signals to the effectors outside the nervous system
Consist of all outgoing motor pathways
-sympatric division parasympathetic division
23.somatic motor division / ans Correct Ans: carries information to somatic effectors such as the skeletal muscles
-carries information to autonomic and visceral effectors like smooth and cardiac muscles , adipose tissue
24.interneurons Correct Ans: integrate signals
25.Reflex Arc Correct Ans: The path of which something is sensed and then th
26.Reflex arc path order Correct Ans: receptor -> afferent sensory neutron -> i efferent neuron ->effector
19. peripheral nervous system Correct Ans: Nerves that are the outlier of the b
-Cranial nerves originate from the brain
-spinal nerves originate from the spinal cord
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