Bio 232 Exam 4 test questions and
answers | guaranteed pass
three types of muscles in the human body are all the following except
- cardiac
- celiac
- smooth
- striated CORRECT ANSWERS celiac
the following are functions; characteristics of muscles except
- heat production
- excitability
- extensibility
- communication CORRECT ANSWERS communication
which of the following statements is true
- cardiac muscle tissue cells have many nuclei
- cardiac muscle tissue cells are found in the heart and large blood vessels
- striated muscles tissue cells are long and cylindrical with many nuclei
- smooth muscle tissue cells have intercalated discs CORRECT ANSWERS striated
muscles tissue cells are long and cylindrical with many nuclei
a muscle cell membrane is CORRECT ANSWERS a sarcolemma
the 2 myofilaments in a myofibril are made mostly of proteins called CORRECT
ANSWERS actin and myosin
"the smallest contractile unit of muscle contraction" is: CORRECT ANSWERS a
sarcomere
the "elastic" protein which attaches thick filaments to the Z discs is called CORRECT
ANSWERS titin
the sarcoplasmic reticulum
- is a reservoir for Ca+
- all are true
- wraps around a myofibril
- have terminal cisterns CORRECT ANSWERS all are true
the "triad" is formed by: CORRECT ANSWERS a "T" tubule and 2 adjacent terminal
cisternae
"T" tubules
- all are true
, - conduct the electrical impulse into the muscle cell
- penetrate into the myofibril
- are a part of the "triad" CORRECT ANSWERS all are true
a motor unit CORRECT ANSWERS is a motor neuron and all the muscle fibers it
supplies
when a muscle cell membrane first receives an electrical impulse to initiate a
contraction CORRECT ANSWERS it is called depolarization
which of the following is false regarding a muscle contraction
-Ca+ floods into the terminal axon when an impulse reaches the terminal end bulb
- ACh is a neuro transmitter
- muscles typically repolarize after contracting
- muscles will only contact when H2O molecules are present CORRECT ANSWERS
muscles will only contact when H2O molecules are present
the "resting potential" of a (muscle) cell membrane CORRECT ANSWERS is typically
positive outside the cell and negative inside the cell
ACh must be "destroyed" immediately after is activates Na+ channels on the
sarcolemma. this occurs by CORRECT ANSWERS acetylcholine esterase
the area of "communication" between an axon terminal bulb, and a sarcolemma is
called CORRECT ANSWERS motor end plate (neuro-muscular junction)
what structure in skeletal muscle cells, functions in calcium storage CORRECT
ANSWERS cistern of S.R.
what is a role of calcium ions in muscle contractions CORRECT ANSWERS bind to
regulatory sites on troponin that open active sites on G - Actin
the "sliding filament" model of contraction involves _______. CORRECT ANSWERS
actin and myosin sliding past each other and partially overlapping
which statement is false regarding muscle contraction
- all are false
- a "twitch" can sometimes last for well over an hour
- the neural impulse from the axon eventually propagates along the entire sarcolemma
- Ca+ release into the axon is stimulated by an electrical impulse CORRECT
ANSWERS a "twitch" can sometimes last for well over an hour
frequency of a stimulus too fast to allow for full repolarization before the next contraction
causing subsequently higher peaks and valleys on an EMG is called CORRECT
ANSWERS wave summation
answers | guaranteed pass
three types of muscles in the human body are all the following except
- cardiac
- celiac
- smooth
- striated CORRECT ANSWERS celiac
the following are functions; characteristics of muscles except
- heat production
- excitability
- extensibility
- communication CORRECT ANSWERS communication
which of the following statements is true
- cardiac muscle tissue cells have many nuclei
- cardiac muscle tissue cells are found in the heart and large blood vessels
- striated muscles tissue cells are long and cylindrical with many nuclei
- smooth muscle tissue cells have intercalated discs CORRECT ANSWERS striated
muscles tissue cells are long and cylindrical with many nuclei
a muscle cell membrane is CORRECT ANSWERS a sarcolemma
the 2 myofilaments in a myofibril are made mostly of proteins called CORRECT
ANSWERS actin and myosin
"the smallest contractile unit of muscle contraction" is: CORRECT ANSWERS a
sarcomere
the "elastic" protein which attaches thick filaments to the Z discs is called CORRECT
ANSWERS titin
the sarcoplasmic reticulum
- is a reservoir for Ca+
- all are true
- wraps around a myofibril
- have terminal cisterns CORRECT ANSWERS all are true
the "triad" is formed by: CORRECT ANSWERS a "T" tubule and 2 adjacent terminal
cisternae
"T" tubules
- all are true
, - conduct the electrical impulse into the muscle cell
- penetrate into the myofibril
- are a part of the "triad" CORRECT ANSWERS all are true
a motor unit CORRECT ANSWERS is a motor neuron and all the muscle fibers it
supplies
when a muscle cell membrane first receives an electrical impulse to initiate a
contraction CORRECT ANSWERS it is called depolarization
which of the following is false regarding a muscle contraction
-Ca+ floods into the terminal axon when an impulse reaches the terminal end bulb
- ACh is a neuro transmitter
- muscles typically repolarize after contracting
- muscles will only contact when H2O molecules are present CORRECT ANSWERS
muscles will only contact when H2O molecules are present
the "resting potential" of a (muscle) cell membrane CORRECT ANSWERS is typically
positive outside the cell and negative inside the cell
ACh must be "destroyed" immediately after is activates Na+ channels on the
sarcolemma. this occurs by CORRECT ANSWERS acetylcholine esterase
the area of "communication" between an axon terminal bulb, and a sarcolemma is
called CORRECT ANSWERS motor end plate (neuro-muscular junction)
what structure in skeletal muscle cells, functions in calcium storage CORRECT
ANSWERS cistern of S.R.
what is a role of calcium ions in muscle contractions CORRECT ANSWERS bind to
regulatory sites on troponin that open active sites on G - Actin
the "sliding filament" model of contraction involves _______. CORRECT ANSWERS
actin and myosin sliding past each other and partially overlapping
which statement is false regarding muscle contraction
- all are false
- a "twitch" can sometimes last for well over an hour
- the neural impulse from the axon eventually propagates along the entire sarcolemma
- Ca+ release into the axon is stimulated by an electrical impulse CORRECT
ANSWERS a "twitch" can sometimes last for well over an hour
frequency of a stimulus too fast to allow for full repolarization before the next contraction
causing subsequently higher peaks and valleys on an EMG is called CORRECT
ANSWERS wave summation
