anatomy chapter 4 quiz

how many muscles attach to the eyeball, allowing it to rotate within the orbit in many directions?

6

what causes an increase in the muscles membrane's permeability, allowing sodium (Na+) ions to diffuse into the cell via special protein ion channels producing an electrical charge?

acetylcholine

synergists are muscles that work together to accomplish a particular movement; _________ are muscles that work in opposition to one another

antagonist

the phrenic nerve innervates the major muscle of breathing, which is called the ________ muscle

diaphragm

each skeletal muscle fiber is surrounded by a layer of connective tissue called the:

epimysium

what is the layer of fibrous connective tissue that separates individual muscle?

fascia

in smooth muscle, electrochemical signals travel quickly from one cell to another. the numerous conduction areas that interconnect the individual cells are called:

gap junctions

the perineum is ___________ in relationship to the coccygeus and levator ani muscles that form the floor of the pelvis

inferior

smooth muscle carries out much of the automatic work of the body without conscious control of the brain; thus smooth muscle is what kind of muscle

involuntary

which cranial nerve innervates the chewing muscles?

5th

all muscles that cause motion of the hand and fingers are inverted by all of the following nerves except the:

axillary

what chemical does the action potential cause to be released from the sacroplasmic reticulum

calcium

what type of muscle has the property of intrinsic automaticity

cardiac

which of the following is not a type of muscle

connective

during breathing the major movement is produced by what type of movement of the diaphragm

contraction

hand, wrist, and finger movements are mediated by extensor and flexor muscles in the forearm. As a rule, the extensor muscles originate in which aspect of the elbow?

lateral

which muscle group provides the greatest muscle mass and strength to the back?

longissimus

the junction between a motor neuron and a muscle fiber is called

neuromuscular junction

which nerve innervates the diaphragm

phrenic

muscles that work together to accomplish a particular movement are called:

synergists

you are dispatched to a motor vehicle crash that i at the edge of your jurisdiction, and the response time is 15 minutes. while in route you receive an update from a first responder on the scene who provided the following information on one of the patients involved. a 36 year old man was driving an older model car; he claims to have sustained whiplash and is feeling dizzy, with blurred vision and pain behind the eyeballs. based on this information, from which direction was this mans car struck?

rear

which of the following is the longest muscle in the body

sartorius

one end of _____ muscle usually is fastened to a relatively immovable part (origin) at a movable joint. the other end connects to a movable part (insertion) on the side of the joint.

skeletal

which of the following types of muscle cells are spindle-shaped and have a single nucleus?

smooth