Transcript Muscle and Nervous Tissue

Muscle Tissues
• Muscle tissue is like what part of an airplane?
• Contract in response to stimulus  muscle
fibers shorten  move body parts
• Types:
– Skeletal
– Smooth
– Cardiac
Skeletal Muscle Tissue
• Cells are long and threadlike
• Cells have striations: alternating light and dark
cross-markings
• Each cell has many nuclei
Skeletal (Cont’d)
• Fun fact: 40% of the body is skeletal muscle
• Where? Muscles that attach to bone and are
moved by conscious, voluntary, effort
• Functions: Muscles with skeletal tissue move
head, trunk, limbs; facial expressions, write,
talk, sing, beat Whitefield in the game tonight,
etc…
Smooth
• Question: Is this tissue striated?
• Smooth = no striations
• Shorter than skeletal, spindle shaped, one
central nucleus
Smooth (Cont’d)
• Fun fact: 10% of the body is smooth muscle
• Where? Walls of hollow internal organs
(stomach, intestine, bladder, uterus, blood
vessels)
• Functions: Movement of substance within the
body (waste, blood, etc) Cannot be contracted
consciously – involuntary
– Ex of involuntary: smooth muscle moves food
through digestive tract
Cardiac
• Cells are striated and branched  make
complex networks, one nucleus
• Can you control when your heart contracts or
beats? Involuntary
Cardiac (cont’d)
• Where? Only in the heart
• Function: pumps blood through the heart
chambers and into blood vessels
Nervous tissue
• Nervous tissue is like what part of an airplane?
• Cells are neurons
– Support cells are neuroglial cells
Nervous tissue (cont’d)
• Where? Brain, spinal cord, nerves
• FUNCTIONS1. NEURONS:
•
•
Sense changes in surroundings and transmit
nerve impulses to other neurons, muscles, or
glands
Coordinate, regulate, integrate body functions
Nervous tissue (cont’d)
2. NEUROGLIAL CELLS:
• Support and bind parts of nervous tissue
• Supply nutrients to neurons (connect to blood
vessels)
Based on what you know of nervous
and muscle tissue…
• Complete this table in pairs:
Type
Function
Location
Skeletal
Gross body mvmt
Attached to skeleton
Smooth
Mvmt of substance in body
Walls of hollow organs, blood
vessels
Cardiac
Mvmt of blood
Heart
Nervous
Neuron: coordination/integration/control
Neuroglial: provide nutrients/structure
for neurons
Brain, Spine, Nerves
Recap
• On a sheet of scrap paper: For each slide,
write the type of muscle or nervous tissue and
explain why.
1.
2.
3.
4.
5.