Histology Lab 3 [email protected].
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Transcript of Histology Lab 3 [email protected].
![Page 2: Histology Lab 3 Scott.lehbauer@lethbridgecollege.ab.ca.](https://reader030.fdocuments.us/reader030/viewer/2022032802/56649e0e5503460f94af88e1/html5/thumbnails/2.jpg)
Muscle Tissues
Muscle Tissue Facts• Well vascularized• Highly cellular tissues• Responsible for most types of body
movement• Posses myofilaments which cause movement
or contraction in all cell types
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Skeletal Muscle
Structure – • Elongated cells• Cells are multi-nucleated• Nuclei are located on
the periphery • Obvious striations
throughout.
Nuclei
Skeletal Muscle
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Skeletal Muscle
Location – • Attached to the skeleton
• Occasionally attached to the skin
Skeletal Muscle
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Skeletal Muscle
Function – • Voluntary movement• Warm blood as the
muscles produce heat. • Locomotion• Facial Expression
Skeletal Muscle
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Smooth Muscle
Structure – • Elliptically shaped cells
with a centrally located nucleus
• There are no striations present.
• Cells are close together to form sheets.
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Smooth Muscle
Location – • Digestive tract• Walls of the Uterus• Blood vessel walls
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Smooth MuscleFunction – • Involuntarily controlled • Produces involuntary
contractions through the linings of the digestive tract and ureters. This movement is called peristalsis.
• Produces involuntary contraction and expansion of the blood vessels (vasodilation / vasoconstriction)
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Cardiac Muscle
Structure – • Centrally located nucleus• Striated• Has branching of muscle
cells with intercalated discs• Involuntary control, control
is actually inherent so no external stimuli is required to cause contraction
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Cardiac Muscle
Location – • In the heart
Intercalated Disc
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Cardiac Muscle
Function – • To contract continuously
from inherent impulse.• Involuntary contraction.
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Nervous Tissue
Nervous Tissue Facts• main component of the nervous system.• Contains 2 major cells types:1. Neurons – are highly specialized nerve cells that
generate and conduct nerve impulses.2. Neuroglia – are supporting cells that are non-
conducting that insulate and protect the neurons.
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Nervous TissueStructure – • Neurons are branching cells.• Cell processes may be quite
long.• Motor neurons have many
dendrites but one axon.• Motor neurons are
myelinated.• Cell body is called a cyton.• Supporting connective tissue
is called Neuroglia
Cyton Neuroglial Cells
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Nervous Tissue
Location – • Brain• Spinal Cord• Peripheral Nerves
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Nervous Tissue
Function – • coordinates activities
between the brain, spinal cord and body organs.
Nucleus of Neuroglial Cell
Cell Nucleus
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X – Section of Spinal Nerve
Epineurium – surrounds several groups of neurons.
Perineurium – surrounds a group of neurons.
EpineuriumPerineurium
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X – Section of Spinal Nerve
Endoneurium – is the covering around one neuron.
Axon – is the central grey spot.
Myelin – is the white surrounding the axon.
Endoneurium Axon
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X – Section of Spinal Cord
White Matter Grey Matter
Central Canal
Meninges
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1.) a.) Name the tissue type below.
b.) What type of cell is labeled B?
B
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2.) a.) Where in the body would you find this tissue type?
b.) What protein accumulates in the cells as you approach the apical surface of this tissue?
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3.) a.) Name the cell type labeled A.b.) Name the structure labeled B.
BA
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4.) a.) Name one function of this tissue type.b.) Name one place in the body you would find this
tissue.
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5.) a.) Name the fiber type labeled A.b.) Name this tissue type.
A
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6.) a.) What is the function of mast cells?
b.) What is the function of fibroblasts?
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7.) a.) Name this tissue type.b.) What is the function of the cell labeled B?
B
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8.)a.) Where in the body would you find this tissue type?b.) What protein is the fiber labeled B made from?
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9.) a.) Name this tissue type.b.) Name the structure labeled B.
B
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10.) a.) Name this tissue type.b.) Name one function of this tissue type.
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EXAM NOTES
1. Exam runs on November 13th from 4-7pm.2. It is in IB1101.3. It will be a power point exam similar to the practice
tests.4. You will have 1 minute per slide and 2 questions per
slide. 5. The exam should take 21 minutes to write.