
Concept explainers
Define the following terms:
a. Alpha rhythm
b. Beta rhythm
c. Delta rhythm
d. Theta rhythm
(a)

To determine:
The definition of alpha rhythm.
Introduction:
The brain is the main organ in all the vertebrates and most invertebrates. It is an important part of the central nervous system. It is the most complex organ present in the human body, which is composed of around 100 billion nerve cells. The brain controls the functioning of all other organs and systems in the body.
Explanation of Solution
Alpha state is active when the brain is in its resting phase. The alpha waves have frequency between 8 and 17 hertz and maintain the calmness, mental coordination, learning, alertness, and mind and body combination.
Alpha rhythm is the electrical activity inside the brain when the brain is at rest.
(b)

To determine:
The definition of beta rhythm.
Introduction:
The brain is the main organ in all the vertebrates and most invertebrates. It is an important part of the central nervous system. It is the most complex organ present in the human body, which is composed of around 100 billion nerve cells. The brain controls the functioning of all other organs and systems in the body.
Explanation of Solution
Beta waves are active in the brain during waking consciousness. During this time, the brain does cognitive tasks and is attentive towards the outside world. Beta means the fast activity of the brain during logical thinking, attention, alertness, judgment making, and focused work.
Beta rhythm is the neural oscillations in the brain during waking consciousness.
(c)

To determine:
The definition of delta rhythm.
Introduction:
The brain is the main organ in all the vertebrates and most invertebrates. It is an important part of the central nervous system. It is the most complex organ present in the human body, which is composed of around 100 billion nerve cells. The brain controls the functioning of all other organs and systems in the body.
Explanation of Solution
Delta waves are very slow waves inside the brain. These waves have low frequencies but are deeply penetrating in nature. They are activated in meditation and sleep without dreams. The frequency of these waves resides between 0.5 and hertz.
Delta rhythm is activated when the brain is in meditation mode.
(d)

To determine:
The definition of theta rhythm.
Introduction:
The brain is the main organ in all the vertebrates and most invertebrates. It is an important part of the central nervous system. It is the most complex organ present in the human body, which is composed of around 100 billion nerve cells. The brain controls the functioning of all other organs and systems in the body.
Explanation of Solution
Theta waves are active when the brain does the functioning of memorizing, learning, and intuitions. In theta waves, senses are taken from the outside and then are focused on signals that originate the. The frequency of theta waves is between 3 and 8 hertz.
Theta waves are activated during memorizing and learning.
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Chapter 31B Solutions
Laboratory Manual For Human Anatomy & Physiology
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