Anatomy: Muscular System Test
The more movable end of a muscle is the
Distal end
Which of the following are a function of skeletal muscle?
all of the above; produce movement, maintain posture, maintain body temperature
Area between Z lines is the
sarcomere
The sarcoplasmic reticulum stores
calcium ions
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
Interactions between actin and myosin filaments of the sarcomere are responsible for
muscle contraction
What human muscles contain ONLY fast fibers?
hand muscles
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 less-movable end of a skeletal muscle is the
Proximal end
rigor mortis occurs at death due to a lack of
ATP
The striated appearance of skeletal muscle results from the
Actin and myosin arrangement
When calcium ions binds to troponin,
Active sites on actin are exposed
In infants, which muscle produces suction for sucking at the breast?
Buccinator
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
The skeletal muscle structures that actively shorten and are responsible for the muscle fiber contraction are calles
Myofibrils
Which of the following is true about red muscles?
Red muscles are slower than white muscles
The longest muscle of the human body is the
Satorius
Which of the following statements describes how muscles help maintain homeostasis?
Skeletal muscle contractions help maintain body temperature
Which of the following is an effect of aging on the muscular system?
Skeletal muscle fibers become smaller in diameter
Muscle cells
can only contract
active muscles generate
carbon dioxide and heat
A person whose genetic makeup makes them a better marathon runner than a sprinter probably has more __________ in their leg muscles.
slow fibers
Which type of muscle fiber is supplied by extensive blood vessels?
slow fibers
Pushing up against a locked door is an example of
Isometric contraction