Textbook Question
The two components of the CNS that are responsible for maintenance of homeostasis are the ________ and the ________.
Ch. 12 The Central Nervous System
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822
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Table of contents
- Ch. 1 Introduction to Anatomy and Physiology26
- Ch. 2 The Chemistry of Life38
- Ch. 3 The Cell55
- Ch. 4 Histology47
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System36
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System42
- Ch. 13 The Peripheral Nervous System41
- Ch. 14 The Autonomic Nervous System and Homeostasis31
- Ch. 15 The Special Senses39
- Ch. 16 The Endocrine System42
- Ch. 17 The Cardiovascular System I: The Heart30
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity45
- Ch. 21 The Respiratory System27
- Ch. 22 The Digestive System27
- Ch. 23 Metabolism and Nutrition7
- Ch. 24 The Urinary System39
- Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Chapter 12, Problem 20
Which of the following statements is false?
a. The suprachiasmatic nucleus is often called the body's 'master clock.'
b. Melatonin and the ventrolateral preoptic nucleus increase the activity of the reticular formation.
c. A decrease in the activity of the reticular formation disconnects the thalamus from the cerebral cortex and decreases the level of consciousness.
d. Orexins are neurotransmitters that stimulate the reticular formation.
Verified step by step guidance1
Step 1: Understand the context of the question. The problem is asking you to identify the false statement among the given options. Each statement relates to the regulation of sleep, wakefulness, and consciousness, which involves specific brain structures and neurotransmitters.
Step 2: Analyze option (a). The suprachiasmatic nucleus (SCN) is indeed referred to as the body's 'master clock' because it regulates circadian rhythms, including sleep-wake cycles. This statement is true.
Step 3: Analyze option (b). Melatonin is a hormone that promotes sleep, and the ventrolateral preoptic nucleus (VLPO) is involved in sleep initiation. However, increasing the activity of the reticular formation is associated with wakefulness, not sleep. This statement appears contradictory and may be false.
Step 4: Analyze option (c). A decrease in the activity of the reticular formation does disconnect the thalamus from the cerebral cortex, leading to a reduction in consciousness. This statement is true.
Step 5: Analyze option (d). Orexins are neurotransmitters that play a role in wakefulness by stimulating the reticular formation. This statement is true. Based on the analysis, the false statement is likely option (b).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Suprachiasmatic Nucleus (SCN)
The suprachiasmatic nucleus is a small region in the hypothalamus that serves as the body's primary circadian clock. It regulates the timing of various biological rhythms, including sleep-wake cycles, by responding to light signals received from the retina. This nucleus plays a crucial role in synchronizing the body's internal clock with the external environment.
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Nucleus
Reticular Formation
The reticular formation is a network of neurons located in the brainstem that is essential for regulating arousal, alertness, and consciousness. It influences the sleep-wake cycle and is involved in filtering incoming stimuli to prevent sensory overload. A decrease in its activity can lead to reduced alertness and a lower level of consciousness.
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Orexins
Orexins, also known as hypocretins, are neuropeptides produced in the hypothalamus that play a significant role in regulating arousal, wakefulness, and appetite. They stimulate the reticular formation, promoting alertness and preventing excessive sleepiness. Dysregulation of orexin signaling is associated with sleep disorders such as narcolepsy.
Related Practice
Textbook Question
Declarative memories are formed by the process of ________ that takes place in the ________, and are stored in the ________.
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Textbook Question
Match the term on the left with its correct description from the column on the right.
____ REM sleep
____ Stage I sleep
____ Delta waves
____ Beta waves
____ Theta waves
____ Stage IV sleep
a. The EEG pattern seen in the deepest stage of sleep
b. The deepest stage of sleep
c. The EEG pattern seen in an alert, awake adult
d. Drowsiness or the lightest stage of sleep
e. The EEG pattern seen in lighter stages of sleep
f. The stage of sleep during which most dreaming takes place
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Textbook Question
Mark the following statements on the role of the brain in movement as true or false. If a statement is false, correct it to make a true statement.
The correction of motor error by the cerebellum can occur over the long term by motor learning.
Textbook Question
Mark the following statements on the role of the brain in movement as true or false. If a statement is false, correct it to make a true statement.
The basal nuclei inhibit inappropriate movements and are required for the initiation of movement.
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Textbook Question
The part of the brain responsible for the production of language is known as:
a. Wernicke's area
b. The prefrontal cortex
c. The auditory association area
d. Broca's area