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When studying the difference threshold the stimulus that remains the same across trials is called the stimulus.?
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What controls sensation of heat?
Three types of sensory neurons are found in the skin. Aδ ("A-delta") fibers These are thinly-myelinated. They transmit signals in response to heat and touch. If the stimulus exceeds a certain threshold, the brain interprets these as acute pain. This is "good pain" because it warns you to do something to take care of the problems, e.g., a hot saucepan. C fibers These are unmyelinated and thus conduct impulses slowly. C fibers also respond to heat and touch. If the stimulus exceeds a certain threshold, the brain interprets these as diffuse, dull, chronic pain. This is "bad pain" because it cannot be alleviated simply by removing the stimulus. It is pain generated by such things as damaged tissue or pain that remains after the stimulus that caused acute pain has been removed. Aβ ("A-beta") fibers These are thickly-myelinated fibers. They mostly respond to painless stimuli such as light touch.
How do scientist learn about plants that are extinct?
Scientists learn about plants that are extinct by studying their fossils. These fossils will often preserve a plant's remains very well.
What is the time difference between Holland and the UK in May?
Holland is always an hour ahead of the UK. In summer most of Europe change the time to move it forward an hour. This is called Daylight-saving. Both the UK and Netherlands do this so the time difference remains the same.
What is the difference between magma and crystal?
Magma is molten rock, the dissolved mineral remains of solid rock. During cooling and solidification, the magma will crystallize into a mass of crystallized mineral components.
What is the difference between skeletons and mummies?
A skeleton is the bony remains of a person with little to no soft tissue remaining. A mummy is a dessicated corpse that has most of the soft tissues remaining over the bones.
What term is defined as the visual impression that remains after the initial stimulus is removed?
afterimage
What controls sensation of heat?
Three types of sensory neurons are found in the skin. Aδ ("A-delta") fibers These are thinly-myelinated. They transmit signals in response to heat and touch. If the stimulus exceeds a certain threshold, the brain interprets these as acute pain. This is "good pain" because it warns you to do something to take care of the problems, e.g., a hot saucepan. C fibers These are unmyelinated and thus conduct impulses slowly. C fibers also respond to heat and touch. If the stimulus exceeds a certain threshold, the brain interprets these as diffuse, dull, chronic pain. This is "bad pain" because it cannot be alleviated simply by removing the stimulus. It is pain generated by such things as damaged tissue or pain that remains after the stimulus that caused acute pain has been removed. Aβ ("A-beta") fibers These are thickly-myelinated fibers. They mostly respond to painless stimuli such as light touch.
How action potential is propagated?
A.P. propagation consists of the movement of the action potential along the axon, axon terminals and dendrites. A.P. propagation is non-decremental meaning that the amplitude of the A.P. remains constant throughout the propagation. Action potentials are also follow the principle of all-or-none fashion. Meaning if there is not enough summation(adding of EPSPs and mEPPs) to bring the stimulus to threshold, then no AP will be elicited
What are the two important principles related to nerve impulses?
1. The All-or-None Law states that the impulse is independent of the properties of the stimulus which started it. As long as the nerve cell is stimulated by an impulse of a certain minimal strength, it makes no difference how strong the exciting impulse is - just as a match or a blowtorch produces the same reaction in a fuse. It either fires or does not and there are no shades in between. The nerve impulse remains at the same strength as it travels along the nerve fiber, just as the spark remains at the same intensity as it moves along the fuse. The reason for this is evident in what has been said about a stimulus releasing energy in the fiber. It does not contribute energy.Impulse size and speed: The nerve impulse varies with the size of the fiber. (It is proportional to the square of the fiber's diameter.The size of the nerve impulse also depends on the condition of the fiber - being altered if drugged, deprived of oxygen, fatigued or in an abnormal state.2. The Frequency Principle states that there are more impulses per second with the stronger stimulus than with the weaker stimulus. A stronger stimulus produces impulses more frequently than the weaker stimulus. The frequency of nerve impulses is thus a function of the intensity of the stimulus.
The ammount that remains after one quantity is subtracted from another?
the difference
How does archaeology give knowledge of early human life?
Archaeology provides insights into early human life by studying artifacts, structures, and remains left behind by past societies. By analyzing these material remains, archaeologists can reconstruct aspects of daily life, social organization, technology, economy, and cultural practices of early humans, helping us understand their behaviors, beliefs, and adaptations to their environment.
What is a constant interval?
An interval that remains the same throughout a sequence
What is the history of archaeology?
Archaeology as a discipline emerged in the 19th century with pioneers like Flinders Petrie and Heinrich Schliemann. Initially focused on ancient civilizations like Egypt and Greece, it has evolved to encompass a wide range of cultures and time periods. Modern archaeology uses scientific methods to uncover and interpret the material remains of past human societies.
How can we learn about ancient people's lives and what they valued?
There are scientists that study past life. An archaeologist (is what they are called) learns about past life by studying remains from long ago.
How do scientist know the first Americans were hunters?
Scientists know that the first Americans were hunters by studying their burial grounds. They can study how they lived by how their remains were left and what was left with them.
What is the difference between coal and petroleum?
Coal is formed by the remains of dead and decayed plants, while Petroleum is formed by the remains of dead and decayed animals and plants
How do scientist learn about plants that are extinct?
Scientists learn about plants that are extinct by studying their fossils. These fossils will often preserve a plant's remains very well.
