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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.
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A sensory neuron carries stimuli from central nervous system to the effector. true or false?
False. A sensory neuron carries stimuli from the peripheral nervous system (such as skin or organs) to the central nervous system (brain and spinal cord) for processing. Effector neurons are responsible for carrying signals from the central nervous system to muscles, glands, or other organs to produce a response to the stimulus.
Is this true or false multicellular organism all the cells have the same shape and job?
False. In a multicellular organism, cells have different shapes and functions that perform specific roles in the organism. Specialization of cells allows for division of labor and enables the organism to carry out complex functions efficiently.
True or false a point mutation is the failure of a chromosome pair to separate during mitosis?
False. A point mutation is a change in a single nucleotide of DNA, leading to a change in the protein encoded by that gene. The failure of a chromosome pair to separate during mitosis is known as nondisjunction, which can lead to chromosomal abnormalities in the daughter cells.
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?
No, the hypothalamus is a region of the brain responsible for regulating various physiological processes such as temperature, hunger, and thirst. Afferent impulses from all senses and body parts are primarily sorted and relayed in the thalamus before being transmitted to the appropriate area of the sensory cortex.
True or false binary fission is a form of sexual reproduction in bacteria?
False. Binary fission is a form of asexual reproduction in bacteria, where a single organism splits into two identical daughter cells. Sexual reproduction involves the fusion of gametes from two different parents to produce genetically diverse offspring.
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 a wave is a force that transmits energy?
True. A wave is a disturbance that carries energy through a medium without carrying matter.
True or false the thalamus receives indirect nerve impulses and relays them to the cortex?
true
When nerve impulses pass to the diaphragm the diaphragm relaxes and exhalation occurs is this true or false?
False. When nerve impulses pass to the diaphragm, it contracts, which expands the chest cavity and allows air to enter the lungs (inhalation). The diaphragm relaxes during exhalation, allowing air to be pushed out of the lungs.
Once a motor neuron has fired all the muscle fibers in a muscle contract?
False
Each olfactory cortical neuron receives input from one receptor at a time?
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
Before an 802.11 station transmits a data frame it must first send an RTS frame and receive a corresponding CTS frame?
true or false? Answer is False.
Is The hypothalamus the area where afferent impulses from all senses and all parts of the body are sorted out?
false
