A&P Chapter 11

Intramuscular injections are commonly used to administer medication because of which of the following characteristics?

a rich blood supply

When the triceps brachii extends the elbow, its action is considered to be that of which of the following?

agonist

Match the type of primary action to its best description.

agonist matches Choice a muscle that contracts to produce a particular movement antagonist matches Choice a muscle that stretches when the agonist contracts synergist matches Choice a muscle that either contributes to tension close to the insertion or stabilizes the point of origin

Match the type of primary action to its correct description.

agonist matches Choice prime mover antagonist matches Choice opposes the agonist synergist matches Choice Assists the agonist

Skeletal muscles are grouped according to their primary actions into which of the following three types?

agonists antagonists synergists

Which type of muscle has widespread muscle fibers over a broad area that collect themselves onto a common attachment site?

convergent muscles

Bundles of muscle fibers, termed ______, lie parallel to each other within a muscle.

fascicles

Many parallel muscles are cylindrical with an expanded central region called a ______.

gaster or body

Common intramuscular injection sites include

gluteal, deltoid, or quadriceps

Which four of the following characterize the different patterns of fascicle arrangement?

parallel pennate circular convergent

Which of the following is an example of a convergent muscle?

pectoralis major

When an appendicular muscle is contracting, the less moveable muscle attachment is usually the ______ attachment.

proximal

What are some terms used in naming muscles according to orientation of fascicles?

rectus oblique

A circular muscle is also called a(n) ______.

sphincter

Usually during axial muscle contraction, the more moveable muscle attachment, the ______ attachment is pulled toward the less moveable muscle attachment.

superior

Which category is utilized in the naming of the extensor radialis longus muscle?

muscle action

The sternocleidomastoid muscle get its name from which category for naming muscles?

muscle attachments

Which category is utilized in the naming of the deltoid muscle?

muscle shape

The gluteus maximus muscle gets its name from which categories for naming muscles?

muscle size

Which of the following is considered a circular muscle?

orbicularis oris

True or false: Parallel muscles have low endurance but are very strong.

False Parallel muscles have high endurance and are not strong.

The orbicularis oris muscle is named for its ______.

arrangement of muscle fascicles and body location

Match the pattern of fascicle arrangement with its best description. Instructions

circular matches Choice concentrically arranged fibers around an opening parallel matches Choice often associated with cylindrical muscles with a central body tendon convergent matches Choice have widespread muscle fibers over a broad area that meet on a common attachment site pennate matches Choice these fascicles are arranged at an oblique angle to the tendon

What are some terms used in naming muscles according to shape?

trapezius deltoid rhomboid

Match the type of pennate muscle with its best description. Instructions

unipennate matches Choice all muscle fibers are on one side of the tendon bipennate matches Choice usually has muscle fibers on both sides of the tendon multipennate matches Choice has branches of the tendon within the muscle

Match the type of pennate muscle with an example of the muscle.

unipennate matches Choice extensor digitorum bipennate matches Choice rectus femoris multipennate matches Choice deltoid