A & P 1 chapter 11 ( Wiley plus )
Forcefully blowing through a trumpet would require contraction of which muscle?
buccinator
Motion will occur at a lever system when
effort at the insertion exceeds the load.
This type of muscle works by stabilizing the origin of the agonist so that it can act more efficiently
fixator
Where is the orbicularis oculi?
D
Which muscle in this figure produces the effort when you plantar flex to see over a taller person in front of your view?
D
Which muscle in this figure can abduct, medially and laterally rotate, and extend the arm at the glenohumeral joint?
F
Acting unilaterally, which muscle in this figure can rotate the vertebral column?
G
Which term best applies to a muscle that acts to move a bone away from the midline of the body?
abductor
The muscle that serves as the "prime mover" during a movement is called the
agonist
Which of the following pairs of muscles are agonist-antagonists (that is, one flexes and the other extends) the forearm?
biceps brachii and triceps brachii
Which fascicle arrangement, under voluntary or involuntary regulation of contraction, can control the opening or closing an orifice (opening)?
circular
Muscle fascicles can be arranged in one of several patterns. Which of the following patterns is not an example of the arrangement of fascicles in a muscle?
elliptical
The __________ muscle(s) is (are) the primary extensor muscle(s) of the vertebral column.
erector spinae
During inhalation, _____ muscles contract to elevate the ribs. During forced exhalation, ______ muscles contract to depress the ribs.
external intercostals; internal intercostals
Based on its name, which of the following best describes characteristics of the biceps femoris muscle?
has two origins and found in the upper leg
Protrusion of an organ through a structure that normally contains it is referred to as a
hernia
When the knee is being flexed, what is the fulcrum?
knee joint
Which of the following is the strongest muscle of mastication?
masseter
This muscle, which is found in the neck, functions to elevate the hyoid bone and help press the tongue against the roof of the mouth during swallowing.
mylohyoid
The attachment of a muscle's tendon to the stationary bone is called the _____; the attachment of the muscle's other tendon to the movable bone is called the _____.
origin, insertion
Exercise can produce a fashionable "six pack" of toned muscles. Which of the following muscles is involved in giving the appearance of this defined pack of muscles?
rectus abdominis
Muscles act on bones to produce movement. The bones act as levers and the joints act as __________.
the fulcrum
When the term rectus appears in the name of a muscle, it indicates that
the muscle fascicles run parallel to the midline of the body
Which of the following is a muscle whose insertion is found on the clavicle and acromion process of the scapula within the pectoral girdle?
trapezius
Which list includes muscles that are responsible for facial expressions?
zygomaticus major, risorius, platysma