a & p muscular system

Which of the following muscles acts to flex the finger joints and wrist?

flexor digitorum

Tensor fasciae latae

ilium

Muscles whose names contain the root cervi- would be found in the

neck

The area between the Z lines is the _________.

sacromere

An olympic long distance marathon winner most likely has an increase number of _______ muscle fibers.

slow

The following describes ___________ fibers. - Contains increased amount of capillary networks, providing oxygen - Contain a red pigment called myoaglobin - Contain oxygen reserves - Contain a relatively larger number of mitochondria than do fast muscle fibers

slow

Nonstriated, involuntary muscle is

smooth

The muscle that inserts with the gastrocnemius to the calcaneus, via the calcaneal tendon, is the

soleus

Which of the following acts to flex the neck?

sternocleidomastoid

Which muscle extends the elbow during the action of push-ups?

triceps brachii

At rest, active sites of the actin are covered by

tropomyosin

Muscles dominated by fast fibers appear _________.

white

Soleus

Fibula/tibia

Trapezius

Thoracic vertebrae

The deltoid acts to

abduct the arm

The striated appearance of skeletal muscle results from

actin and myosin arrangement on the sarcomere

Which of the following terms is a descriptive word for a muscle's action ?

adductor

Which of the following terms is a descriptive word for a muscle's action?

adductor

A skeletal muscle that is not regularly stimulated by a motor neuron will become smaller and weaker; such as in those individuals that are paralyzed by spinal injuries. The term used when this occurs to the muscles is _______________.

atrophy

rectus femoris

extends leg at the knee

gastrocnemius

extension at the ankle

The following describes _______ type of skeletal muscle fibers. - Produce powerful contractions - Fatigue rapidly - Few mitocondria

fast

Biceps femoris

femur

A muscle _________ contains a sarcolemma, sacroplasm and myofibrils

fiber

biceps femoris

flexes leg at the knee

Specific name for the plasma membrane of the myofiber.

sarcolemma

Nonstriated, involuntary muscle is _________.

smooth

What muscle types guard the enterance and exits of the body ?

sphincters

How do skeletal muscles produce movement ?

By pulling on tendons that then moves bones.

What type of endurance is gained from preforming increased amounts of brief, intense workouts. Such as sprinting or weightlifting.

Anaerobic endurance

Choose the 3 muscles that make up the hamstring group ?

Biceps femoris; Semimembranosus; Semitendinosus

After a contraction, the sarcomere will return to a resting state; which is

Calcium ions deplete and troponin confirmation returns

Deltoid

Clavicle/scapula

Which muscle has an action of hip extension.

Gluteus maximus

Flexor carpi ulnaris

Humerus/ulna

Consider the Sliding Filament Theory: Observed changes in the sarcomere. Which band or line gets smaller during a muscle contraction ?

I band

Buccinator

Maxillary/Mandible

Which statement regarding "heat loss" is true?

Muscle contractions play an important role in the maintenance of normal body temperature.

Which of the following statements describes how muscles help maintain homeostasis?

Skeletal muscle contractions help maintain body temperature.

Which statement regarding skeletal muscle is true?

Skeletal muscles contain blood vessels.

Internal intercostals

Superior border of the preceding rib

The muscle that flexes the knee

biceps femoris

Rigor mortis occurs at death due to a lack of

blood circulation to move Calcium ions out of the cell.

In infants, which muscle produces suction for suckling at the breast ?

buccinator

The muscle that compresses the cheeks, as when pursing the lips and blowing forcefully, is the ________.

bucinator

Active muscles generate ________.

carbon dioxide and heat

After death, rigor mortis lasts until

decomposition begins

The muscle that adducts the shoulder is the

deltoid

The supraspinatus assists the ______________ muscle.

deltoid

Which of the following muscles is named for its shape?

deltoid

Muscle used for inhalation of breath

diaphragm

masseter

elevates the mandible

Which of the following describes the action of the trapezius?

elevates, adducts, depresses, or rotates the scapula

Which of the following is a muscle that originates from the zygomatic arch and functions in elevating the mandible?

massester

The less-movable end of a skeletal muscle is the

origin

A sheath of connective tissue surrounding a bundle of striated muscle fibers is called __________.

perimysium

Skeletal muscle fibers differ from "typical cells" in that these muscle fibers

the name of the cytoplasm is sarcoplasm in the muscle cell.

Which of the following is characteristic of cardiac muscle?

Cardiac muscle cells are involuntary

allows for electrical stimuli sent from the brain, to reach deep into each fiber

T tubules

Diagastric

Temporal bone/Mandible

What creates "cross-bridges"

When the myosin heads bind to the active sites

Which filiament is a thin twisted protein that contains specific active sites ?

actin

Myofibrils are made primarily of __________.

actin and myosin

The orgin of the soleus is ________ and the insertion is __________

Fibula/tibia; calcaneus

_________________ is the abductor of the shoulder

Supraspinatus

Which of the following is an effect of aging on the muscular system?

Tolerance for exercise decreases.

_________ moves away from the active sites.

Tropomyosin

A layer of collagen fibers that surrounds an entire muscle is called ________.

epimysium

A person whose genetic makeup makes him or her a better marathon runner than a sprinter probably has more __________ in his or her leg muscles.

slow fibers

Which muscle inserts on the clavicle and scapula?

trapezius