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51 terms

Exam 4

STUDY
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Which of the following statements is true
striated muscle cells are long and cylindrical with many nuclei
which of th efollowing are composed of myosin
thick filaments
muscle tissue has all of the following properties except___
secretion
when a muscle is unable to respond to stimuli temporarily it is in which of the following periods
refractory period
the oxygen-binding protein found in muscle cells is
myoglobin
the condition characterized by drooping eyelids, muscle weakness. I ti s more common in females
Myasthenia Gravis
The muscle cell membrane is called the
sarcolemma
After nervous stimulation stops what prevents ACh in the synaptic cleft from continuing to stimulate contraction?
Acetylcholinesterase destroying the ACh
Immediately following the arrival of the stimulus at a skeletal muscle cell there is a short period called the ____ period during which the vents of excitation-contraction coupling occur
latent
the term central nervous system refers to the
brain and spinal cord
what are ciliated CNS neuroglia that play an active role in moving and producing the cerebrospinal fluid called
ependymal cells
Which ion channel opens in response to a change in membrane potential (charge) and participates in the generation and conduction of action potentials
Voltage-gated channel
which of the following is not a function of the autonomic nervous system
innervation of the skeletal muscle
which of the following is not a function of astrocytes
provide the defense for the CNS
Bruising of the quadriceps femoris and a blood clot was produced
Charleyhorse
which of the following is not true of end plate potentials
They are unstoppable
Which of the following is not a special characteristic of neurons
the are mitotic
Immediately after an action potential has passed, which cellular gates open
potassium
schwann cells create
the myelin sheath
which of the choices below describes the ANS
Motor fivers that conduct nerve impulses from the CNS to smooth muscles, cardiac muscle, and glands
The part of a neuron that conducts impulses away from it's cell body is called an
axon
What is the resting state of a muscle cell
negatively charged and contains less sodium
Shcwann cells are functionally similar to
Oligodendrocytes
The disease where muscle atrophies but actually enlarges due to fat and connective tissue deposits in the muscle. Strikes between 2-10
Muscular dystrophy
The 3 functions of the nervous system include all of the following except
Intelligence
what is the smallest contractile unit of muscle
a sarcomere
What is the role of tropomyosin in skeletal muscles
Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules
Excitation-contraction coupling requires which of the following substances
Ca + ATP
what structure in skeletal muscle cells functions in calcium storage
sarcoplasmic reticulum
ATP is used in the following stages/functions of muscle contraction except for
to move the neurotransmitter across the synaptic cleft
What produces the striations of a skeletal muscle cell
the arrangement of myofilaments
During muscle contraction, myosin cross bridges attach to which active sites
actin filaments
During contraction of a muscle fiber thick filaments attach to thin filaments and make
crossbridges
the remnents of the schwann cell is also called the
neurilemma
the giant protein titin maintains the organization of the ______ assisting in muscle stretching
A band
Muscle tone is _______
a state of sustained partial contraction
A sarcomere is the distance between two
Z discs
The ____ contains only the actin filaments
I band
The thicker filaments are the _____ filaments
Myosin
Both actin and myosin are found in the ______
A band
The myosin filament are located in the _____
A band
The sliding filament model of contraction involves
Actin and myosin sliding past each other and partially overlapping
what part of the sarcolemma contains acetylcholine receptors
Moter end plate
Only _____ muscle cells are always mutinucleated
Skeletal
Only ____ muscle cells commonly branch
cardiac
That part of the nervous system that is voluntary and conducts impulses from the CNS to the skeletal muscles is the _____ nervous system
Somatic
A gap between schwann cells in the peripheral system is called
Nodes of Ranvier
____ potentials are short-lived, local changes in membrane potential
End plate
______ muscle is spindle shaped and uninucleated
smooth
____ receive impulses and transmit them to the soma of the neuron
dendrite
_____ transmits impulses away from the soma to another neuron of effector cell
axon