ANIMAL PHYSIOLOGY: Movement and Muscle Control Flashcards
is composed of differentiated cells containing
contractile proteins, which have the special ability to
shorten or contract to move the body parts.
Muscle tissue
Characteristics of a Muscle 5 S.E.C.E.E
Specialized cells
Excitability/irritability
Contractility
Extensibility
Elasticity
elongated, high density of myofilaments
or cytoplasmic filaments of actin and myosin.
Specialized cells
ability to respond to stimuli.
Excitability/irritability
ability to contract
Contractility
ability of a muscle to be stretched
Extensibility
ability to recoil and return to its normal shape
after stretch
Elasticity
Muscle Function 5
- Produce Movement
- Maintain Posture and Body Position
- Stabilize Joints
- Generate Heat
- Additional Functions
are packaged into organs called BLANK that attach to the skeleton.
Skeletal muscle
are spindle-shaped, uninucleate, and surrounded by scant endomysium and are arranged in two layers
Smooth Muscle
s striated, uninucleated and under involuntary
control.
cardiac muscle
are the structural and functional units of
skeletal muscle
Sarcomeres
are the precise arrangement of even smaller
structures within sarcomeres Thick and Thin Myofibrils
Myofilaments
interconnecting tubules and sacs that is used for store calcium and to release it on demand when the muscle fiber is stimulated to contract
Sarcoplasmic reticulum
contain synaptic vesicles filled with neurotransmitter which stimulates skeletal muscle fibers is
Acetylcholine
states that a “muscle fiber will contract
to its fullest extent when it is stimulated adequately;
it never partially contracts.
Muscle Law
Types of Muscle
Contraction 2
Isotonic contractions
Isometric contractions
- the myofilaments are successful in their sliding movements, the muscle shortens, and movement occurs. Bending the knee, lifting weights, and smiling are all examples of isotonic contractions
Isotonic contractions
the myosin filaments are “spinning their wheels,” and the tension in the muscle keeps increasing. They are trying to slide, but the muscle is pitted against some more or less immovable object.
Isometric contractions
