01 Oct Chemicals released at the axon terminal are called:
Human Anatomy and Physiology I
Question 1Chemicals released at the axon terminal are called:
Secretions
Neurotransmitters
Inhibitors
Neurons
Question 2Which statement is true regarding neurons?
All axons have myelin sheaths surrounding them
The action potential is transmitted from the cell body to the axon terminal
They are only found in the central nervous system
Dendrites pass information from the neuron to another cell
Question 3Inhibitory synapses cause depolarization, leading to the possibility of an action potential formation.
True
False
Question 4Which portion of the neuron processes information?
Axon
Dendrites
Soma
Myelin
Question 5Which choice is true regarding neuroglia cells?
Oligodendrocytes produce myelin sheaths
Schwann cells function are located in the central nervous system
The majority of neuroglia cells are found in the peripheral nervous system
Astrocyte cells protect the neurons by acting almost like an immune cell
Question 6During an action potential, positive ions move into the cell as the depolarization spreads down the axon.
True
False
Question 7An action potential can only be propagated along a myelinated axon.
True
False
Question 8Dopamine is categorized as which structural type of neurotransmitter?
Amino acids
Muscle contractor
Inhibitory
Biogenic Amines
Question 9As long as neurotransmitters are bound to a receptor, ion channels remain open.
True
False
Question 10The generation or creation of an action potential depends on the strength of the stimulus a neuron receives.
False
True
Question 11Which statement is true regarding the neuron synapse?
The binding of a neurotransmitter always causes an excitatory effect on that cell, never inhibitory
The presynaptic and postsynaptic neuron membranes are not physically separated
Binding of a neurotransmitter on the postsynaptic neuron membrane can generate an action potential in that neuron
The human body only uses one type of neurotransmitter in all of its synapses
Question 12Which portion of the neuron receives information?
Axon
Dendrites
Myelin
Soma
Question 13During relative refractory period, a neuron cannot create another action potential to a stimulus no matter how strong or intense that stimulus is.
False
True
Question 14Which statement is true regarding neurons?
Myelin sheaths provide protection to the axons but slow the nerve impulse (action potential) through it
Neurotransmitters are released from the axon terminal(s)
The nucleus of the neuron is located in the axon
Both the axons and dendrites receive information from other neurons and cells
Question 15The resting membrane potential of a neuron, specifically in the axon, is more negatively charged inside when compared to the extracellular space (outside of the cell).
False
True
Question 16The autonomic nervous system is a sub-division of sensory (afferent) division?
False
True
Question 17Which statement is true regarding the action potential process?
The repolarization phase must occur prior to depolarization
Depolarization occurs because voltage gated K+ channels allow K+ ions to rush into the cell
The action potential process only occurs at the nodes of Ranvier in myelinated axons
Hyperpolarization allows for Na+ and K+ ions to move into and out of the cell
Question 18Which statement is true regarding neurons?
Motor (efferent) neurons transmit information from one muscle to another muscle
Sensory (afferent) and Motor (efferent) neurons are considered part of the peripheral nervous system
Interneurons are found in both the central and peripheral nervous system
Sensory (afferent) neurons transmit information from the brain to muscles
Question 19Which choice is true regarding myelin sheaths?
Myelin sheaths cover dendrites in the central and peripheral nervous system
Myelin sheaths help release neurotransmitters from the axon terminal
Myelin sheaths allow for the conduction of nerve impulses (action potentials) to be transmitted faster
Myelin sheaths are composed of astrocytes and satellite cells
Question 20Which statement is true regarding action potentials (nerve impulses)?
Is typically only generated in the dendrite portion of a neuron
Neuroglia are solely responsible for creating action potentials
When action potentials reach the axon terminal, they cause the release of neurotransmitters
An action potential moves from the axon to the soma of a neuron
Question 21Which statement is true regarding the nervous system?
Damaged myelin on an axon has no effect with its ability to transmit an action potential
Depolarization is the reduction of the membrane potential; going from negative to a more positive charge
Neuroglia cells are only responsible for providing immunity to the nervous cells
Neurons can communicate with other cells without the use of neurotransmitters
Question 22During the repolarization phase of an action potential, the neuron begins to regain its negative internal charge.
True
False
Question 23Which of the following ions rushes into the axon terminal, causing the release of neurotransmitters into the synaptic cleft?
Potassium
Sodium
Calcium
Magnesium
Question 24Action potential is unique to neurons and muscle cells. Other body cells do not use this process.
True
False
Question 25Which statement is true regarding the motor (efferent) division of the nervous system?
Transmits information from the central nervous system to the body
2.
Pertains to sensory information/stimuli
3.
It is part of the central nervous system
4.
Delivers information about the external environment to the brain
