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What stage of mitosis is characterized by the disintegration of mitotic spindles and the formation of two new nuclear membranes?
Telophase
What happens during metaphase?
The stage in mitosis or meiosis in which the duplicated chromosomes line up along the equatorial plate of the spindle. - Dictionary.com
What are the names of the stages of sleep?
During sleep, we usually pass through five phases of sleep. These stages progress in a cycle from stage 1 to rapid-eye-movement (REM) sleep, then the cycle starts over again with stage 1. We spend almost 50 percent of our total sleep time in stage 2 sleep, about 20 percent in REM sleep, and the remaining 30 percent in the other stages. Infants, by contrast, spend about half of their sleep time in REM sleep. During stage 1, which is light sleep, we drift in and out of sleep and can be awakened easily. Our eyes move very slowly and muscle activity slows. People awakened from stage 1 sleep often remember fragmented visual images. Many also experience sudden muscle contractions called hypnic myoclonia, often preceded by a sensation of starting to fall. These sudden movements are similar to the "jump" we make when startled. When we enter stage 2 sleep, our eye movements stop and our brain waves (fluctuations of electrical activity that can be measured by electrodes) become slower, with occasional bursts of rapid waves called sleep spindles. In stage 3, extremely slow brain waves called delta waves begin to appear, interspersed with smaller, faster waves. By stage 4, the brain produces delta waves almost exclusively. It is very difficult to wake someone during stages 3 and 4, which together are called deep sleep. There is no eye movement or muscle activity. People awakened during deep sleep do not adjust immediately and often feel groggy and disoriented for several minutes after they wake up. Some children experience bedwetting, night terrors, or sleepwalking during deep sleep. When we switch into REM sleep, our breathing becomes more rapid, irregular, and shallow, our eyes jerk rapidly in various directions, and our limb muscles become temporarily paralyzed. Our heart rate increases, our blood pressure rises, and males develop penile erections. When people awaken during REM sleep, they often describe bizarre and illogical tales - dreams. The first REM sleep period usually occurs about 70 to 90 minutes after we fall asleep. A complete sleep cycle takes 90 to 110 minutes on average. The first sleep cycles each night contain relatively short REM periods and long periods of deep sleep. As the night progresses, REM sleep periods increase in length while deep sleep decreases. By morning, people spend nearly all their sleep time in stages 1, 2, and REM. People awakened after sleeping more than a few minutes are usually unable to recall the last few minutes before they fell asleep. This sleep-related form of amnesia is the reason people often forget telephone calls or conversations they've had in the middle of the night. It also explains why we often do not remember our alarms ringing in the morning if we go right back to sleep after turning them off1.1. http://healthjournal.upmc.com/0205/SleepPhases.htm
How does the 2nd stage of the mitotic phase overlap with the 1st stage?
The second stage of the mitotic phase, called metaphase, overlaps with the first stage, called prophase, in terms of time. This means that while one cell is going through metaphase, another cell in the same population may be in prophase. However, the events that occur in these two stages are distinct. In prophase, chromosomes condense and the nuclear envelope breaks down, while in metaphase, the condensed chromosomes align at the center of the cell.
What is measured during a polysomnography study?
Important parts of the polysomnography study include measurements of: heart rate. airflow at the mouth and nose. respiratory effort. sleep stage (light sleep, deep sleep, dream sleep, etc.). oxygen level in the blood,using a.(ear oximetry).
The rhythmic bursts of brain activity that occur during stage 2 sleep are called?
sleep spindles
Sleep spindles are characteristics of what kind of sleep?
Stage 2
What stage of sleep do sleep spindles occur?
Sleep spindles occur during stages 2 of sleep, they are brief bursts of frequency in our brain wave patterns
What stage of sleep does sleep talking occur?
The small minority of people who do sometimes talk when asleep appear to do so during the NREM or non rapid eye movement phases of their night's total sleep, and do not appear to remember dreaming in connection with what they said.
During which stage do you have sleepwalking and sleep talking?
Stage 4
What stage of sleep does sleepwalking occur in?
It happens in the 4th stage
At what sleep stage do nightmares occur?
They occur during REM sleep, usually in the second half of the night
Do buterflys sleep?
only during their cocoon stage
In which stages of sleep would a person be most difficult to wake?
The stage during which it is most difficult to wake someone is the "deep sleep" stage. During this stage, brain waves, breathing, and heart rate are the slowest.
What stage of sleep is insomnia?
none. if you can not sleep then you suffer from insomnia. The most restful sleep comes during the R.E.M. stage known as rapid eye movement. This is the stage you dream in. It takes about 2 hours to reach REM sleep.
Which stage of mitosis splits the chromosomes and pulls them apart with spindles?
metaphase
A recurring sleep stage during which most vivid dreams commonly occur is known as?
Most vivid dreams occur during REM sleep, which stands for Rapid Eye Movement. REM The vividness of dreams might depend more on whether one awakens directly from the dream or not, rather than the stage of sleep where dreams occur. Sleep studies have shown that REM (rapid eye movement) sleep correlates closely with dreaming, but dreams occur during other sleep stages as well. Night terrors, sleep walking and other disturbances tend to appear during deep or slow-wave sleep, Stage N3. See the attached Wikipedia article, below, for further information and resources. In REM sleep. REM-sleep. It stands for rapid eye movement, a characteristic of dreaming in which the eyes flutter side to side very quickly as the brain works. It happens during stage 5 of sleep.
