Quiz 7
Which part of a neuron transmits an electrical signal to a target cell?
Axon
Varying degrees of contractive force in a skeletal muscle are generated through the process of what?
Motor unit recruitment
A muscle-forming stem cell is called a what?
Myoblast
The following types of glial cells (supportive cells) are responsible for helping to synthesize myelin, the insulation of axons:______ in the central nervous system (CNS) and_______in the peripheral nervous system (PNS
Oligodendrocytes; Schwann cells
In muscular hypertrophy, what happens to muscle fibers?
Structural proteins are added and cell diameter increases
Which of the following is not a type of muscle tissue?
Elastic Muscle
The two general types of cells found in the nervous system are ____and_____
Neurons; glial cells
Which of the following terms would be used in the name of a muscle that moves the leg away from the body?
abductor
What neurotransmitter is released at the neuromuscular junction?
acetylcholine
Slow oxidative (SO) muscle fibers
Use primarily aerobic respiration
Upon skeletal muscle membrane depolarization, what structures are triggered to open?
Voltage-gated sodium channels
Which of the following helps an agonist work?
a synergist
The nervous system is involved in receiving________about the environment around and then generating_________to that information
information, responses
Which part of a neuron contains the nucleus?
soma
Which of the following statements is corrèct about what happens during flexion?
The angle between bones is decreased
Which of the following statements is/are correct?
The white matter of the CNS is made up of bundles of axons The gray matter of the CNS is made up of numerous neuron cell bodies Both A and B are correct
All but which of the following are characteristics of aerobic respiration?
Glycolysis
Smooth muscle tissue can be found in all but which of the following places?
Heart
Which structures of cardiac muscle allows the cells to contract in waves so the heart can work as a pump?
Intercalated discs
What two types of macromolecules are the main components of myelin?
phospholipids and proteins
A synapse is the location where the axon of a neuron connect with another neuron or a muscle fiber. The following characteristic(s) are always present in chemical synapses:
presynaptic element neurotransmitter (packaged in vesicles) synaptic cleft receptor proteins All the above are present
Where does amuscle fiber first respond to signaling from a motor neuron?
Neuromuscular Junction
All of the following are functions of skeletal muscles except for which?
Regulate blood pressure
The functional unit of a muscle fiber is called what?
Sarcomere
The threshold membrane potential difference is
-55m/V
The resting membrane potential is primarily due to the differences in concentrations of which ions?
Sodium and potassium
Which of the following voltages would most likely be measured during the relative refractory period?
-80 mv
Various chemical methods work together to maintain what is called the normal resting membrane potential difference between the inside and the outside of each neuron. This resting membrane potential is
70mV
Which type of contraction allows a muscle to produce tension without changing the angle of a skeletal joint or moving a load?
A motor neuron and the muscle fibers it innervates
Which of the following is probably going to propagate an action potential fastest?
A thick, myelinated axon
Orice an action potential is initiated in a neuron, that depolarication then is
A. propagated B. contnuousdy conducted in an unmyelinated nerve fiber C.conducted in a saltatory manner in a myelinated nerve iber A,B, and c are correct
In the Sliding Filament Model of Contraction, actin and myosin filaments slide past one another using what as an energy source?
ATP
Which two proteins interact to cause a contraction in skeletal muscle?
Actin and Myosin
The division of the nervous system that includes the brain and the spinal cord is the _________ nervous system
Centeral
Which property allows muscle tissue to pull on its attachment points and shorten with force?
Contractility
Voltage-gated sodium channels open upon reaching what state?
Threshold
How is Treppe different from Tetanus?
Treppe occurs with relaxation in between stimuli
The skeletal muscles are divided into__________(muscles of the trunk and head) and_________ (muscles of the arms and legs) categories
axial, appendicular
Which part of a neuron transmits an electrical signal to a target cell?
axon
Which of these locations is where the greatest level of integration is taking place in the example of testing the temperature of something?
cerebral cortex
Which of these locations is where the impulses to cause a movement, for example away from a stimulus, are initiated?
cerebral cortex
Which of the following cavities contains a component of the central nervous system?
cranial
If a thermoreceptor is sensitive to temperature sensations, what would a chemoreceptor be sensitive to?
molecules
Think about the things that you do each day-talking, walking, sitting, standing, and running-all of these activities require movement of particular
skeletal muscles, joints
The nervous ______system is responsible for conscious perception and voluntary motor responses. The _________nervous system is responsible for involuntary control of the body
somatic, autonomic
Which is moved the least during muscle contraction?
the origin
Sensory neurons have nerve endings in the skin that can sense a stimulus. Which of the following are examples of sensory neurons in the skin?
touch heat pain
