muscle tissues muscle tissue is like what part of an airplane? contract in response to stimulus ...
TRANSCRIPT
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• FUNCTIONS-1.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/controlNeuroglial: 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.
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