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Is this true of false a nerve is a single neuron that transmits nerve impulses?
Wiki User
∙ 13y ago
A nerve impulse moves FROM one neuron to another at a SYNAPSE.
A synapse can be a CHEMICAL synapse (most common?), or an ELECTRICAL synapse.
At a CHEMICAL synapse, chemicals called NEUROTRANSMITTERS are released from the pre-synaptic neuron into a small gap between the neurons (SYNAPTIC CLEFT), and diffuse quickly to the post-synaptic neuron, and then cause ligand-gated ion pores to open, which allow sodium IONS into the neuron (often at a DENDRITE); these sodium ions cause an ELECTROTONIC impulse to occur, which, when it reaches the AXON HILLOCK, if it's strong enough, can cause an ACTION POTENTIAL to occur in the AXON.
When the axon is depolarized to reach threshold, voltage-gated sodium channels open, and the action potential is initiated. The action potential works its way down the axon until it reaches the axon terminal, releasing neurotransmitters thereby initiating synaptic transmission.
Wiki User
∙ 11y ago
Wiki User
∙ 13y agoFalse. Neurons bundle together by a connective tissue layer, the endoneurium forming a fascicle. A number of fascicles grouped by a connective tissue layer, the perineurium make one nerve which is surrounded by another connective tissue layer, the epineurium!
Wiki User
∙ 13y agoA nerve is made from many neurones, not one.
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A sensory neuron carries stimuli from central nervous system to the effector. true or false?
A sensory neuron ALWAYS carries information into the CNS. A MOTOR neuron ALWAYS carries information from the CNS to MUSCLES and other effectors. Sensory in, motor out.
Is this true or false multicellular organism all the cells have the same shape and job?
False. Cells in multicellular organisms have a great dfference in their specilizations. Compare a neuron with a skin cell.
Is the hypothalamus is the area where afferent impulses from all senses and all parts of the body are sorted out and relayed to the appropriate area of the sensory cortex?
False
Is it True or False that all cells have the same structure but different functions?
False - cells can differ in structure in order to perform a specific function. For example, neurons (nerve cells) are electrically excitable. These have an axon (long section that conducts impulses, and ends which branch out - called dendrite. This is an example of a cell structure unique to a certain function.
True or false a point mutation is the failure of a chromosome pair to separate during mitosis?
false, point mutation is the change in any single base within DNA at a given time.it occurs only once during a single mutation
True or false a wave is a force that transmits energy?
false
Is it true or false a mechanical wave transmits energy through a vacuum?
not
When nerve impulses pass to the diaphragm the diaphragm relaxes and exhalation occurs is this true or false?
False
True or false a neuron can have only one axon?
True
Impulses from motor neurons control the contraction of skeletal muscles?
false
Does a neuron become depolarized during an inhibitory postsynaptic potential?
False
Does an unmyelinated fiber conduct impulses faster than a myelinated fiber?
False
True or false the thalamus receives indirect nerve impulses and relays them to the cortex?
true
Each olfactory cortical neuron receives input from one receptor at a time?
False
Once a motor neuron has fired all the muscle fibers in a muscle contract.?
False
An afferent sensory neuron carries stimuli from the central nervous system to the effector?
False
Once a motor neuron has fired all the muscle fibers in a muscle contract?
False
