Domanda del libro di testo
Sympathetic preganglionic neurons synapse:
a. directly on target cells.
b. on skeletal muscle fibers.
c. on sympathetic chain or collateral ganglia.
d. on vagal ganglia.
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Ch. 14 The Autonomic Nervous System and Homeostasis
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814
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TOC.tableOfContents
- Ch. 1 Introduction to Anatomy and Physiology24
- Ch. 2 The Chemistry of Life37
- Ch. 3 The Cell54
- Ch. 4 Histology46
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System35
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System41
- 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 Heart28
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity41
- 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
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814Non è quello che usi tu?Cambia libro di testo
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Amerman 3rd EditionCh. 14 The Autonomic Nervous System and HomeostasisProblema L2.3
Amerman 3rd EditionCh. 14 The Autonomic Nervous System and HomeostasisProblema L2.3Capitolo 14, Problema L2.3
Describe all the changes initiated by the parasympathetic nervous system that will take place when you finish the race. How will these changes maintain homeostasis?
Guida verificata passo dopo passo1
The parasympathetic nervous system, often referred to as the 'rest and digest' system, is activated after the race to counteract the effects of the sympathetic nervous system ('fight or flight'). Its primary role is to restore the body to a state of homeostasis. Begin by identifying the major organs and systems affected by parasympathetic activation, such as the heart, lungs, digestive system, and glands.
The parasympathetic nervous system decreases heart rate and blood pressure by reducing the activity of the sinoatrial (SA) node in the heart. This helps conserve energy and allows the cardiovascular system to return to a resting state. Explain how this reduction in heart rate contributes to homeostasis by preventing overexertion of the heart.
Respiratory rate is reduced as the parasympathetic system decreases the activity of the respiratory centers in the brainstem. This slows breathing and allows oxygen and carbon dioxide levels in the blood to stabilize. Discuss how this adjustment ensures proper gas exchange and prevents hyperventilation, maintaining homeostasis.
The parasympathetic system stimulates the digestive system by increasing peristalsis (wave-like muscle contractions) and secretion of digestive enzymes. This allows the body to process nutrients effectively after the race. Highlight how this supports homeostasis by replenishing energy stores and repairing tissues.
Sweat gland activity decreases as the parasympathetic system reduces the stimulation of sweat production. This prevents excessive fluid and electrolyte loss, helping to maintain hydration and electrolyte balance. Explain how this contributes to overall homeostasis by stabilizing internal conditions after physical exertion.
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Parasympathetic Nervous System
The parasympathetic nervous system (PNS) is a component of the autonomic nervous system responsible for promoting 'rest and digest' functions. It counteracts the 'fight or flight' response of the sympathetic nervous system, facilitating bodily processes such as decreased heart rate, increased digestive activity, and energy conservation. After intense physical activity, the PNS helps restore the body to a state of calm.
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1:56
Function of the Parasympathetic Nervous System
Homeostasis
Homeostasis refers to the body's ability to maintain a stable internal environment despite external changes. This involves regulating various physiological parameters, such as temperature, pH, and electrolyte balance. The PNS plays a crucial role in homeostasis by initiating processes that counterbalance the effects of stress and physical exertion, ensuring that the body returns to its optimal functioning state.
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01:59Introduction to Homeostasis
Physiological Changes Post-Exercise
After finishing a race, several physiological changes occur due to the activation of the PNS. These include a reduction in heart rate, bronchoconstriction, increased salivation, and enhanced digestive activity. These changes are essential for recovery, allowing the body to replenish energy stores, repair tissues, and restore normal function, thereby supporting overall homeostasis.
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Percorso guidato
04:26Post-Translational Modification
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Using 20 or fewer words, define each of the following terms in your own words.
b. Parasympathetic nervous system
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