Study sets, textbooks, questions
Upgrade to remove ads
Neuromuscular Anatomy & Physiology
Terms in this set (32)
Attached to bone, responsible for moving the skeleton.
Surrounds various organs and tubes (blood vessels, bronchial tubes).
Propels blood through the circulatory system.
Also known as skeletal muscle cell. over 660 skeletal muscles; have diameters between 10 and 100 µm; may be up to 20 cm in length.
Skeletal Muscle Function
-pull on bones to allow movement (produce force)
- is under voluntary control
-provide the basis for all human movement
-it refers to the activation of the muscle to produce force (tension)
Speed of movement remains the same.
Muscle contraction that produces movement of the skeleton
Static/ Isometric Contraction
No movement occurs
Example: Pushing against a wall
Types of Muscular Contractions
-Static/ Isometric Contraction
Connect muscles to bone.
Examples of Muscle Actions
Each muscle is bound together by a sheath of connective tissue.
The interior of the muscle that is divided into bundles of muscle fibers.
Surrounds the fasciculi.
Surrounds each fiber.
The contractile structures of the cell.
Each muscle fiber contains hundreds to thousands of these smaller cylindrical units.
Contractile proteins (thick and thin) that are responsible for muscle contraction.
the functional unit of a skeletal muscle fiber.
Separates the sarcomere.
Three basic Principles of The Sliding Filament Theory of Muscle Contraction
-Force is generated as actin filaments Slide over the myosin filaments
-The lengths of the filaments do not change during contraction
-The length of the sarcomere decreased as the myosin filaments pull the Z discs together
The Sliding Filament Theory of Muscle Contraction
When a muscle contracts, the sarcomere shortens (Z discs come together)
Degree of Pennation
directly affects the number of sarcomeres per cross-sectional muscle area.
The number of muscle fibers in a muscle remains essentially
constant throughout life.
Changes in muscle size are due to a change in the size of cells known as
hypertrophy (increasing size) or atrophy (decreasing size).
an increase in the number of cells (not in humans)
Two basic types of muscle fibers
-Slow-twitch fibers (Type I)
-Fast-twitch fibers (Type II)
Slow-twitch fibers (Type I)
-the first to be recruited for any activity
-Used in everyday activities
-They are slow to fatigue (fatigue resistant)
-They are smaller and produce less force than fast twitch fibers
-Appear darker under a microscope
Fast-twitch Fibers (Type II)
recruited after (but in addition to) slow-twitch fibers during activities requiring larger forces and/or power
-They are larger and generate force quickly (high power)
-Used for anaerobic activities (sprinting, weightlifting)
-Appear white in color
Force is the greatest
at slow speeds
the neuron and all the muscle fibers it innervates
A motor unit is either activated completely or is not activated at all.
Recommended textbook explanations
Anatomy & Physiology Student Workbook
Kent Pryor, Richard Allan, Tracey Greenwood
Human Anatomy And Physiology
Elaine N. Marieb, Katja Hoehn
The Human Body in Health & Disease
Gary A. Thibodeau, Kevin T. Patton
Anatomy and Physiology
Sets with similar terms
Biology 201- Chapter 9
Applied Anatomy Muscles and Nerves Oklahoma State…
Human Anatomy Chapter 10
Chapter 10 Muscle Tissue
Other sets by this creator
Chapter 16 GENB 7305
Chapter 15 GENB 7305
Chapter 14 GENB 7305
Chapter 13 GENB 7305