Rhythmic contraction and relaxation of heart is called <u>The</u><u> </u><u>Cardiac</u><u> </u><u>Cycle</u> .
Answer:
B
Explanation:
The experimental drug has a direct effect on the dependent variable which is the presence of the headache.
The main function of the central nervous system (CNS) is responsible for integrating sensory information and responding accordingly. It consists of two main components: The spinal cord serves as a channel for signals between the brain and the rest of the body. It also controls simple musculoskeletal reflexes without input from the brain.
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<span>The
Glossopteridales are the fossils that occur on the most of the landmasses. They
are the extinct group of seed plants. The rapid appearance of this one gives us
more understanding about the Paleobiography, this is the study of animals and
plants distribution through the years.
The appearance of Glossopteridales fossils also helped scientists to study so
much about their species, that includes their seeds, leaves, branches and their
oddly shaped roots. They grew at the beginning of the Permian and started to extinct
at the end of the Permian period.</span>
Answer:
Action potential in a motor neuron triggers the release of acetylcholine (ACh) neurotransmitter.
Explanation:
Acetylcholine: It is a neurotransmitter released by motor neurons which bind to the receptors end plates of the motor. When an action potential travel down the motor neuron's axon, neurotransmitter release occurs resulting in an influx of calcium and altered permeability of the synaptic terminal membrane.
The Ca2+ ions allow synaptic vesicles to move and bind with the presynaptic membrane which is present on the neuron and released neurotransmitter from the vesicles into the synaptic cleft. Once it's released ACh diffusion occurs across the synaptic cleft to the motor end plate, and binds with ACh receptor. As the neurotransmitter ACh binds, these ions channel open and sodium ions cross the membrane into the muscle cells.
In this phase reduction of voltage inside and outside the cell occurs, which is known as depolarization. When ACh binds to the motor end plate this depolarization is known as end plate potential. Then depolarization spread with the sarcolemma and creating an action potential. This action potential moves the entire cell and creating a wave of depolarization.
