Anatomy muscular system

Muscle cells

can only contract

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

hypertrophy

Creatine phosphate serves to

supply energy to synthesize ATP

Rigor mortis occurs at death due to lack of

ATP

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

Acetylcholine is broken down by acetylcholinesterase

When calcium Ion binds to troponin

Active sites on Actin are exposed

Which statement regarding isometric contractions is true

The tension produced never exceeds the load

Which of the following regarding skeletal muscle is true? A) skeletal muscles are directly, not indirectly, attached to the bones. B) skeletal muscles do not contains connective tissue. C) skeletal muscles do not maintain body temperature. D) skeletal muscles do not contain nervous tissue. E) skeletal muscles contain blood vessels.

E) Skeletal muscles contain blood vessels.

Tom is having difficulty dorsiflexing and inverting his right foot. Which muscle is most likely involved in this problem?

Tibialis anterior

What is the function of the transverse tubule

To transmit electrical impulses to the cells interior

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

Triceps brachii

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

Troponin

Hey single-stimulus-contraction-relaxation sequence in a muscle fiber is known as

Twitch

Match the muscle with its action from the list below A) dorsiflexion B) extends leg C) plantar flexion D) addcucts thigh E) flexes leg 1) rectus femoris 2) biceps femoris 3) gastrocnemius

1)extends leg 2)flexes leg 3)plantar flexion

Each myofibril consist of approximately ________________________ Sarcomeres.

10,000

1) Contraction begins. 2) action potential releases T-tubules 3)troponin binds calcium ions removing tropomyosin from Actin active sites 4)ACh is released 5)contraction ends 6)cross bridges form 7)SR recaptures calcium ions 8)SR releases calcium ions

4 2 8 3 6 1 7 5

A sheath of connective tissue that surrounds a bundle of striated muscle fibers is called... A)endomysium B)perimysium C)sarcolemma D)epimysium E)sarcoplasmic reticulum

B)perimysium

The muscle that compresses the cheeks, as one person in the lips and blowing forcefully, is the _______________

Buccinator

In response to action potentials arriving from the transverse tubules, the sarcoplasm releases

Calcium ions

Which of the following is a characteristic of cardiac muscle?

Cardiac muscle cells are striated

During which phase is the stimulus frequency so high that the relaxation phase is eliminated ?

Complete tetanus

Al layer of collegian fibers that surrounds the entire muscle is called... A)endomysium B)perimysium C)sarcolemma D)sarcomere E)epimysium

E)epimysium

Which of the following statements describes how muscles help maintain homeostasis. A)the contractions of skeletal muscles pull ion tendons and move elements of the skeleton. B)skeletal muscles are responsible for guarding the openings of the urinary and digestive tracts. C)skeletal muscles are responsible for the pumping action of the heart. D)skeletal muscles support the weight of some internal organs. E)skeletal muscle contractions help maintain body temperature.

E)skeletal muscle contractions help maintain body temperature.

A motor unit that innervates thousands of muscle fibers

Has less Percision and control

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

Have many nuclei

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

I band

Anaerobic endurance

Is exemptlified by contractions of fast muscle fibers

Which of the following is a muscle that originates from the zygomatic arch and functions and elevating the mandible to chew or talk

Masseter

During activities requiring anaerobic endurance

Most of the muscles energy is produced in mitochondria

The specialized sarcolemma that contains acetylcholine receptors is the

Motor end plate

Neurotransmitters that call Skeltah muscle contraction are normally stored in

Motor neuron axon terminals

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

Soleus

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

Muscle fatigue

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

Neck

The last movable end of the skeleton muscle is the

Origin

Which of the following is true about red muscles?

Read muscles or slower than white muscles

Botulism

Results from a bacterial toxins that prevents the release of acetylcholine in axon terminals

The area between the z-lines is the

Sarcomere

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

Sarcoplasmic reticulum

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

Skeletal muscle fibers become smaller in diameter

A person who's genetic make up makes him or her a better marathon runner than a sprinter probably has more ____________________ in his or her leg muscles

Slow fiber

Which type of scenario is most likely?

Small motor units are recruited first

Non-striated, involuntary muscle is

Smooth