Chapter 7 A & P: muscles
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
