Anatomy - Skeletal Muscle Review

Which of the following muscles is named for its shape?

Deltoid

A resting muscle generates most of its ATP by

Aerobic respiration

The specialized sarcolemma that contains acetylcholine receptors is the

Motor end plate

Neurotransmitters that cause skeletal muscle contraction are normally stored in

Motor neuron axon terminals

Which statement regarding "heat loss" is true?

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

Exhaustion of energy reserves or decline in pH due to production and dissociation of lactic acid causes

Muscle fatigue

The skeletal muscle structures that actively shorten and are responsible for muscle fiber contraction are called

Myofibrils

The striated appearance of skeletal muscle results from

The actin and myosin arrangement

The muscle that dorsiflexes the foot is the

Tibialis anterior

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

Triceps brachii

During active-site exposure, calcium ions bind to which of the following?

Troponin

Tropomyosin strands are held in position by which of the following?

Troponin molecules

Muscle fascicles are separated by

Perimysium

Rigor mortis occurs at death due to a lack of

ATP

The deltoid acts to

Abduct the arm

Which of the following is one of the steps that ends a contraction?

Acetylcholine is broken down by acetylcholinesterase

The ________ contains vesicles filled with acetylcholine.

Axon terminal

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

Buccinator

Muscle cells

Can only contract

Active muscles generate

Carbon dioxide and heat

Which of the following describes the action of the trapezius?

Elevates, adducts, depresses, or rotates the scapula

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

Endomysium

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

Epimysium

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

Flexor digitorum

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

Have many nuclei

The term used to describe muscular growth in response to usage is

Hypertrophy

The area of the sarcomere that is the light regions between two successive A-bands is the

I band

Which of the following sarcomere components is made up of proteins that connect the central portions of each thick filament to its neighbors?

M line

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

Masseter

Which of the following is true about red muscles?

Red muscles are slower than white muscles

Which of the following is an accurate characteristic of slow fibers?

Resting slow muscle fibers contain oxygen reserves

The area between Z lines is the

Sarcomere

The skeletal muscles store calcium ions in the terminal cisternae of the

Sarcoplasmic reticulum

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

Skeletal muscle contractions help maintain body temperature

Acetylcholinesterase is found within the

Synaptic cleft

Regarding a skeletal muscle fiber, wherever a T-tubule encircles a myofibril, the tubule is tightly bound to

The sarcoplasmic reticulum

Myofibrils are made primarily of

Actin and myosin

When a calcium ions binds troponin

Active sites on actin exposed

A muscle ________ contains a sarcolemma, sarcoplasm, myofilaments, and myofibrils.

Fiber

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

Neck

The less-movable end of the skeletal muscle is the

Origin

Which statement regarding skeletal muscle is true?

Skeletal muscles contain blood vessels

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