histology - deer park independent school district / · pdf file3 types of muscle •...
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Histology
Muscle Tissue And
Nerve Tissue
Histology
Muscle Tissue
Muscle Tissue
• Functions for – Support – Movement (contraction)
– Body heat
3 Types of Muscle
• Skeletal muscle – Body movement – Many nuclei/cell
3 Types of Muscle
• Skeletal muscle – Striated (stripes) – Voluntary (you control)
Skeletal Muscle
Striations
(stripes) Nuclei
Skeletal Muscle
Skeletal Muscle
Skeletal Muscle
3 Types of Muscle
• Smooth muscle – Visceral (organs) – Walls of vessels – Stomach & GI tract
3 Types of Muscle
• Smooth muscle – Long narrow fibers – One nuclei/cell
3 Types of Muscle
• Smooth muscle – Non-striated – Involuntary
Smooth Muscle
Smooth Muscle
Nuclei
Smooth Muscle
Smooth versus Skeletal
Smooth versus Skeletal
Smooth
Smooth Muscle
Intestinal Wall Smooth Muscle
3 Types of Muscle
• Cardiac muscle – Striated – Involuntary – Heart
3 Types of Muscle
• Cardiac muscle – Cross striations – Dark bands called intercalated disks • 2 membranes meet • Passage for message from one cell to next, allows heart to beat
Cardiac Muscle
Intercalated disk
Nuclei
Cross Striations
Cardiac Muscle Bifurcation – Splitting of cell
Cardiac Muscle
Cardiac Muscle Intercalated disks
Cardiac versus Skeletal
Intercalated disks
Histology
Nerve Tissue
Function of Nerves
• Receive stimuli • Interpret • Respond
System Includes:
•Central Nervous System (CNS) – Brain – Spinal cord
• Peripheral Nerves
System Includes:
•Peripheral Nervous System (PNS) – Sensory Nerves – Motor Nerves
Nervous Tissue :
1. Neuron or nerve cell 2. Neuroglia or Glia
cells - supporting cells
Nerve Cell:
• Cell body (soma) – with nucleus
Nerve Cell:
• Cell body (soma) – with nucleus
Cell body
Nerve Cell:
• Dendrites (one or more) - receive
stimulus - stimulus
moves toward soma
Nerve Cell:
Dendrites
Nerve Cell:
• Axons (one) - receive
stimulus - stimulus
travels away from soma
Nerve Cell:
• Axons • protected by
myelin sheath
• Only one
axon per cell
Axon
How does the signal pass from cell to cell?
Neurotransmitters are released at the axon terminal
to travel to the dendrite of the next neuron