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