Upload
hope-walton
View
214
Download
0
Tags:
Embed Size (px)
Citation preview
Chap 9 Muscle Tissue Intro
Learning Objectives:1. Compare & contrast the basic types of muscle
tissue.2. Describe the characteristics of each muscle type.3. Explain the effects of high intensity resistance
exercise on skeletal muscle.
Review lecture notes. Review Wrap-up practice questions. Study diagrams discussed today.
DISCUSSION
• Besides skeletal muscle (like we’ve seen on the previous slide), what are the other types of muscle in the body? Where are these other types found?
Muscle Overview• Three types of muscle tissue: _______,
______________, and ___________. These differ in structure, function, and location.
• “Mus” (in the word muscle) means _________________ in Latin
• “Myo” or “Sarco” refers to ________
Muscle Similarities
• Skeletal and smooth muscle cells are elongated and are called _____________.
• Muscle contraction depends on two kinds of myofilaments – _____ and _______.
• Muscle terminology is similar– Sarcolemma – muscle plasma __________– Sarcoplasm – __________ of a muscle cell
Characteristics of Muscle Tissue
• _________ or irritability – the ability to receive and respond to stimuli
• _________ – the ability to shorten forcibly
• __________ – the ability to be stretched or extended
• __________ – the ability to recoil and resume the original resting length
Muscle Functions• Skeletal muscles are responsible for all
___________• ________ muscle is responsible for coursing the
blood through the body• ________ muscle helps maintain blood
pressure, and squeezes or propels substances (i.e., food, feces) through organs
• Muscles also maintain ________, stabilize _______, and generate heat
Quick Check1. What are the 3 types of muscle tissue?
2. Muscles functions include maintaining ________, stabilizing _______, and generating _______
Skeletal Muscle
• Packaged in skeletal muscles that attach to and cover the bony _________
• Has obvious stripes called _________• Is controlled _________ (i.e., by conscious
control)• Contracts ______ but tires _______• Is responsible for overall body _________• Is extremely adaptable and can exert forces
ranging from a fraction of an ounce to over __ pounds
Skeletal Muscle continued
• Each muscle is a discrete ________ composed of muscle tissue, blood vessels, nerve fibers, and connective tissue
• The three connective tissue sheaths are:– ____mysium – fine sheath of connective tissue
composed of reticular fibers surrounding each muscle fiber
– _____mysium – fibrous connective tissue that surrounds groups of muscle fibers called fascicles
– ____mysium – an overcoat of dense regular connective tissue that surrounds the entire muscle
Label your practice
diagram with the 3
connective muscle sheaths
(circles in red)plus striations
Striations (stripes)
Skeletal Muscle• Each ________ is served by one nerve,
an artery, and one or more veins
• Each skeletal muscle fiber is supplied with a nerve ending that controls __________
• Contracting fibers require continuous delivery of oxygen and nutrients via ________
• Wastes must be removed via ______
Skeletal Muscle Attachments
______ - the point or mode of attachment of a skeletal muscle to bone or other body part that moves
• ________ - end of the muscle that is attached to a bone that does not move when the muscle contracts
Most skeletal muscles span joints and are attached to bone in at least two places.
Muscle Attachment continued
Muscles attach:– __________ – epimysium of the muscle is
fused to the periosteum of a bone– __________ – connective tissue wrappings
extend beyond the muscle as a tendon
Microscopic Anatomy of Skeletal Muscle
- densely packed, rodlike contractile elements that make up most of the muscle volume
- muscle plasma membrane
Label the sarcolemma and myofibril only.
Smooth Muscle - Composed of spindle-shaped fibers with no _______________ - Have ________________ only (not other connective sheath layers) - Found in walls of hollow organs (except the heart) - Have essentially the same contractile mechanisms as skeletal muscle
Cardiac Muscle
• Found in the walls of the _________
• Branching chains of cells with __________
• Endomysium is attached to the heart
• ___________ control