A&P Chapter 12
Why does a stroke on the cheek feel different from a slap on the face?
-- A light touch generates a low frequency of action potentials while a firmer pressure generates a high frequency of action potentials. -- A firm pressure stimulates a larger number of pressure-sensitive neurons than does a light touch.
What factors contribute to a lack of neurogenesis in most parts of the brain?
-- Inhibitory influences from neuroglia. -- Absence of growth stimulating cues present during fetal development.
Which of the following statements is incorrect?
4. Afferent neurons carry information about muscles to the spinal cord. 5. Motor neurons carry information about muscles to the spinal cord.
Which of the following statements is incorrect?
A large amount of synthesis occurs in the axon
How are neurotransmitters removed from the synaptic cleft?
ALL-- Diffusion -- Uptake by cells -- Enzymatic degradation
Which of the following is mismatched?
All of these are matched correctly.
Somatic NS
Controls Voluntary actions
Autonomic NS
Controls involuntary actions
Enteric NS
Controls involuntary actions
T/F An inhibitory postsynaptic potential will bring a membrane closer to threshold but normally does not initiate a nerve impulse.
False
Which of the following statements is INCORRECT?
Gamma amino butyric acid and glycogen are excitatory neurotransmitters.
A _____ is a cluster of neuronal cell bodies located in the CNS
Nucleus
In _____ conduction, the impulse jumps from Node of Ranvier to Node of Ranvier.
Saltatory
Which of the following statements is INCORRECT?
The resting membrane potential is normally -47 mV
T/F A sensory receptor functions to detect internal and external stimuli. The information is then passed to the brain and spinal cord.
True
T/F An excitatory postsynaptic potential depolarizes the membrane while an inhibitory post synaptic potential hyper polarizes it.
True
T/F Integration involves processing information by analyzing it and deciding upon an appropriate response
True
T/F Neural circuits are functional groups of neurons that process specific types of information.
True
T/F Nitric oxide is synthesized on demand and has a very brief action period. It quickly diffuses from the cell that produced it to other cells where it activates an enzyme necessary for production of a second messenger.
True
T/F The regeneration tube guides the growth of a new axon from the proximal area across the injured area to the distal area where it replaces the original axon
True
Which of the following statements is INCORRECT?
Parallel after discharge circuits may be involved in short term memory.
The ______ is the outermost nucleated cytoplasmic layer of a Schwann cell which incloses the myelin sheath.
neurolemma
T/F Myelination reduces the speed of propagation of an action potential.
False
Which of the following statements is INCORRECT?
The autonomic system is voluntary and carries information from receptors located primarily in viscera to the central nervous system.
