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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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