A&P WileyPlus Orion 8-13
Complete PowerPhys Experiment: Action Potentials, and answer this question. Resting Membrane potentional for the pyramidal neuron in this experiment was approximately (approximate because values vary everytime the experiment is performed)
-65 mV
The speed of nerve impulse is determined by all of the following EXCEPT a.) stimulus strength b.) temperature c.) presence of myelin d.) absence of myelin e.) fiber diameter
A.) stimulus strength
Which of the labeled structures in the diagram represents a neurotransmitter receptor?
D
Which labeled structure in the diagram contains the cell bodies of sensory neurons?
Dorsal root ganglion
In the diagram, identify the Schwann cell.
E
Both spinal and cranial nerves have dorsal and ventral roots.
False
Fast-glycolytic fibers contain many capillaries and large amounts of hemoglobin and myoglobin.
False
Glaucoma is caused by abnormally high intracular pressure that results in decreased blood flow that damages the rods and cones.
False
The thick and thin filaments in smooth muscle tissue are arranged in sarcomeres (similar to skeletal muscle), while in cardiac muscle tissue, the filaments are irregularly distributed throughout the cytoplasm.
False
There are four lateral ventricles in the brain.
False
Fear stimulates the activation of the parasympathetic division of the ANS.
False (Parasympathetic = rest & digest) (Sympathetic= fight or flight)
The neuroglia that produce the myelin sheath around axons in the peripheral nervous system are called
Schwann cells
___________ is an acute infection of the peripheral nervous system caused by the herpes zoster virus.
Shingles
The sympathetic or fight or flight division of the ANS is also called the
Thoracolumbar division
A loss of transparency of the lens is know as a cataract.
True
Absence of a normal pupillary light reflex may indicate damage to the brain.
True
Cardiac muscle is striated and involuntary.
True
Changes in the release of the neurotransmitter, dopamine, are associated with Parkinson's disease.
True
During skeletal muscle contraction, the myosin heads pull on actin causing the thin filaments to slide toward the center of the sarcomere.
True
Microglia are macrophages of the CNS.
True
Saltatory conduction occurs only in myelinated axons and involved a nerve impulse jumping from one node of Ranvier to the next.
True
Skeletal muscle tissue is striated and voluntary.
True
Spinal nerves are mixed nerves
True
The loss of the covering produces by oligodendrocytes or schwann cells is callled demyelination.
True
There are twelve pairs of cranial nerves and 31 pairs of spinal nerves.
True
View the "Animation: Membrane Potentials", then answer the question. Pores are membrane transports proteins that are always open.
True
Which of the labeled structures in the diagram is the fourth ventricle?
Under the cerebellum (tree looking)
A motor unit in a skeletal muscle is defined as
all the muscle fibers controlled by a single motor neuron
Lou Gehrig's disease is the common name for a neurodegenerative disease called
amyotrophic lateral sclerosis
Intercalated discs are characteristics structures found in
cardiac muscle
During anaerobic cellular respiration in skeletal muscles, pyruvic acid produced by _____ is converted into ______.
glycolysis; lactic acid
Which of the following is controlled by the sympathetic division of the ANS?
increases heart activites
The attachment of a skeletal muscle at the more movable end is the
insertion
Saltatory conduction
is faster than continuous conduction
Which of the following is an autoimmune disease that results in the destruction of myelin sheaths of neurons in the central nervous system?
multiple sclerosis
Cardiac muscle tissue is
striated, uninucleated, and involuntary
A stimulus strong enough to generate a nerve impulse is called
threshold stimulus
The iris, ciliary body, and choroid are part of the
vascular tunic