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34 terms

Muscular System

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Skeletal Muscle
Blank may be defined as voluntary striated muscle that is usually attached to one or more bones
Striations
Skeletal muscle exhibit a microscopic pattern of alternating light and dark bands, or blank, which result from the overlapping arrangement of the contractile proteins within each cell
Muscle Fibers
Because of their extraordinary length, skeletal muscle cells are usually called blank
Cardiac Muscle
Blank is also striated, but its involuntary- not normally under conscious control
Cardiocytes
Cardiac muscles are called blank rather than fibers
Smooth Muscle
Blank is also involuntary, and unlike skeletal and cardiac muscle, it lacks striations
Movement
Muscles enable us to move from place to place and to move individual body parts; they move body contents in the course of breathing, blood circulation, feeding and digestion, defecation, urination, and childbirth
Stability
Muscles maintain posture by preventing unwanted movements
Muscular System
Composed of the skeletal system
Myology
The study of the skeletal muscles
Fusiform Muscles
Blank are thick in the middle and tapered at each end
Parallel Muscles
Blank have a fairly uniform width and parallel fasicles
Triangular Muscles
Blank are fan-shaped- broad at one end and narrower at the other
Pennate Muscles
Blank are feather-shaped
Circular Muscles
Blank form rings around certain body openings
Indirect Attachment
the muscle ends conspicuously short of its bony destination
Tendon
The gap is bridged by a fibrous band or sheet called a blank
Aponeurosis
In some cases, the tendon is a broad sheet called an blank
Direct Attachment
In a blank, there is so little separation between muscle and bone that to the naked eye, the red muscular tissue seems to emerge directly from the bone
Origin
The bony site of attachment at the relatively stationary end of a muscle is called its blank
Insertion
The attachment site at the more mobile end of a muscle is called the blank
Belly
The middle, usually thicker region of a muscle is called the blank
Prime Mover
Is the muscle that produces most of the force during a particular joint action
Synergist
is a muscle that aids the prime mover
Action
The effect produced by a muscle, whether it is to produce or present a movement is called its blank
Antagonist
blank is a muscle that opposes the prime mover
Antagonistic Pair
The brachialis and triceps represent an blank of muscles that act on opposite sides of a joint
Fixator
is a muscle that prevents a bone from moving
Intrinsic Muscle
An blank is entirely contained with a particular region, having both its origin and insertion there
Extrinsic Muscle
An blank acts upon a designated region but has its origin elsewhere
Lever
Any elongated, rigid object that rotates around a fixed point called the fulcrum
Fulcrum
A lever is any elongated, rigid object that rotates around a fixed point called the blank
Effort
Rotation occurs when an blank applied to one point on the lever overcomes a resistance located at some other point
Resistance
Rotation occurs when an effort applied to one point on the lever overcomes a blank located at some other point