Chapter 5 test

Smooth Muscle

muscle that has no striations and is involuntary

Motor Unit

group of muscle fibers under the control of one motor neuron

perimysium

covers fascicle

Cross Bridges

formed between actin and myosin filaments during muscle contraction.

Sarcolemma

The plasma membrane surrounding a muscle fiber that plays a key role in muscle contraction and excitation.

Insertion

movable end of a musclethat attaches to the bone it moves.

Origin

fixed end of a muscle

Peristalsis

The involuntary contraction and relaxation of muscles in the digestive tract that moves food along the gastrointestinal tract.

Aponeusrosis

serves as a fascia to bind muscles together or as a means of connecting muscle to bone

Muscle Fiber

Single muscle cells that make up skeletal, smooth and cardiac muscle tissue

Action Potential

Causes entire motor neuron unit muscle fibers to contract in response to a stimulus, resulting in muscle contraction.

Fascicle

a bundle of structures, such as nerve or muscle fibers or conducting vessels in plants.

Supination

palms facing upwards

Pronation

palms facing downwards

When a muscle contracts it….. on the bones at the attachment site

pulls

The ability of a muscle to response to a stimulus

irritability

Extensibility - the ability of a muscle to be

stretched

Nerve that stimulates skeleton muscle

motor neuron

Muscle always shorten when they develop tension

False

An isometric contraction there is no change in muscle

True

Maysin heads create cross bridges

True

When stimulated to create tension muscle can only push

False

Skeleton Muscle contain nucleus

Multiple

All of the following are behaviors of muscle except

bendability

Which muscle is involuntary

A and C

Release of ion….

Calcium

Which of the following is not a muscle of head neck

Intercoastal

Which of the following is a major muscle in the back

Trapezius

Which of the following muscle is attached to the Achilles tendon

Gastrocnemius

All of the following are members of the hamstring group

Sartorius inseam

abduction

movement away from the central body

adduction

movement toward the body/toward midline

Agonist

moves bone

antagonist

opposes the movement of the agonist

concentric

agonist contracts, antagonist relaxes

Eccentric

agonist contracts while lengthening,
antagonist relaxes

Isometric

both agonist and antagonist contract

Planes

Sagittal

Dorsiflexion: toes pointed upward

Plantar: toes pointed downward

Flexion: hands up

Extension: hands down/to the sides

Hyperextension: hands a little to the back

Frontal

Abduction

Adduction

Radial deviation: toward radius

Ulnar deviation: toward ulna

Transverse

Lateral Rotation: moving the foot out

Medial Rotation: moving the foot inwards

Pronation

Supination

Multiplanar

Circumduction: in a circle

Opposition

Biceps brachial

Deltoid

rectus femoris

gastrocnemius

Sartorius