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