Chapter 7 A & P: muscles

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Intercalated disks are found in?

Cardiac muscle

The opposite movement of rotation?

Circumduction

Tonic contractions?

Don't shorten the muscle and move a muscle and are important in maintaining posture

Refers to ankle and foot movement?

Dorsiflexion

Tension during muscle lengthening is often called?

Eccentric contractions

The loose connective tissue outside the muscle organs that forms a flexible, sticky "packing material" between the muscles, bone and skin is called?

Fascia

Groups of muscle fibers are called?

Fascicles

What part of the body does the masseter move?

Head and neck

What part of the body does the zygomaticus move?

Head and neck

Not a muscle of the trunk?

Iliopsoas

The muscle attachment to the more movable bone is?

Insertion

The muscle contracts but doesn't shorten, even though an increase in muscle tension does occur. This sentence describes?

Isometric contractions

The muscle contracts and shortens and the insertion end moves toward the point of origin. This describes?

Isotonic contractions

Not a muscle of the head and neck?

Latissimus dorsi

What part of the body does the biceps femoris move?

Lower extremities

What part of the body does the gastrocnemius move?

Lower extremities

What part of the body does the sartorius move?

Lower extremities

A single motor neuron with all the muscle cells it innervates is called a ?

Motor unit

The thick myofilament of the skeletal muscles is made of?

Myosin

Which systems play a role in body movement?

Nervous, respiratory and circularatory

The point of contact between the nerve and the muscle fibers it stimulates is called a?

Neuromuscular junction

The muscle attachment to the more stationary bone is?

Origin

The movement that is opposite dorsiflexion?

Plantar flexion

Is not a muscle that moves the upper extremities?

Rectus abdominis

Movement around a longitudinal axis is?

Rotation

The basic contractile unit of a skeletal muscle is the?

Sacromere

Straitions are found in?

Smooth muscle, cardiac muscle

The hand position when the body is in anatomical position?

Supination

A buses is a saclike structure that is filled with?

Synovial fluid

The connective tissue that attaches muscle to bone is?

Tendon

When a muscle contraction occurs?

The action and myosin gets shorter

When a muscle fiber I'd subjected to a stimulus, it contracts completely. This is called?

The all or none law

If a prime mover flexes a joint?

The antagonist will extend the joint

If an injury causes damage to the insertion of the biceps brachii muscle, the injury would be nearest?

The elbow

To produce a smooth movement at a joint

The prime mover and synergists must contract

Not a muscle that moves the lower extremities?

Trapezius

What part of the body does the external oblique move?

Trunk of the body

What part of the body does the rectus abdominis move?

Trunk of the body

A quick, jerky response to a stimulus seen in isolated muscles but is not important in normal muscle activity?

Twitch contraction

What part of the body does the deltoid move?

Upper extremities

What part of the body does the pectoralis major move?

Upper extremities

Another name for smooth muscle is?

Visceral muscle

Another name for skeletal muscle is?

Voluntary muscle

Moving a part of the body away from the midline?

Abduction

Moving a part of the body away from the midling of the body is?

Abduction

The thin myofilament of the skeletal muscles is made of?

Actin

When calcium bien released into the sarcomere?

Acts as a cross bridge between action and myosin

Moving a part of the body toward the midline of the body?

Adduction

Endurance training leads to?

An increased number of blood vessels to the muscle

Strength training leads to?

An increased number of myofilaments

A fluid filled sac that actsbas a lubricating structure for muscle movement?

Bursae

What allows you to lift different weights with the same muscle is the?

# of motor units used by the muscle

If you weigh 120 lbs, your skeletal muscles weight about?

50 lbs

The minimal level of stimulation required to cause a fiber to contract is called?

A threshold stimulus


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