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Ch. 14 The Autonomic Nervous System and Homeostasis
Amerman - Human Anatomy & Physiology 2nd Edition
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822Not the one you use?Change textbook
All textbooksAmerman 2nd EditionCh. 14 The Autonomic Nervous System and HomeostasisProblem L2.2
Chapter 14, Problem L2.2

You are running a race to the top of a mountain. Explain all the changes your sympathetic nervous system will initiate to maintain homeostasis as you run the race.

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The sympathetic nervous system (SNS) activates the 'fight or flight' response to prepare the body for physical exertion. It signals the adrenal medulla to release epinephrine and norepinephrine, which act as hormones to increase heart rate and blood pressure, ensuring that oxygen and nutrients are delivered efficiently to muscles.
The SNS causes bronchodilation in the lungs, widening the airways to increase oxygen intake. This ensures that the respiratory system can meet the increased oxygen demand of the muscles during the race.
Blood flow is redirected by the SNS. Vasoconstriction occurs in non-essential areas like the digestive system, while vasodilation occurs in skeletal muscles, ensuring that blood is prioritized for areas actively involved in running.
The SNS stimulates glycogenolysis in the liver and lipolysis in adipose tissue, breaking down glycogen and fat stores to release glucose and fatty acids into the bloodstream. These serve as energy sources for the muscles during prolonged physical activity.
Sweat glands are activated by the SNS to produce sweat, which helps regulate body temperature and prevent overheating as the body generates heat during the race.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Sympathetic Nervous System

The sympathetic nervous system is a part of the autonomic nervous system responsible for the body's 'fight or flight' response. During stressful situations, such as running a race, it activates physiological changes to prepare the body for increased physical activity, including increased heart rate, dilation of airways, and enhanced blood flow to muscles.
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Homeostasis

Homeostasis refers to the body's ability to maintain a stable internal environment despite external changes. During intense physical activity, the body must regulate factors such as temperature, pH, and electrolyte balance to ensure optimal functioning, which is crucial for performance and overall health.
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Physiological Changes During Exercise

During exercise, the body undergoes several physiological changes to support increased energy demands. These include elevated heart rate and blood pressure, increased respiratory rate for oxygen intake, and the release of hormones like adrenaline, which enhance energy availability and mobilize fat stores for fuel.
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Related Practice
Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

c. The visceral motor division is also known as the autonomic nervous system and maintains homeostasis of many physiological variables.

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Textbook Question

Regulation of heart rate, blood pressure, and digestive functions is carried out by the:

a. Somatic motor division of the peripheral nervous system.

b. Central nervous system.

c. Visceral sensory division of the peripheral nervous system.

d. Autonomic nervous system.

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Textbook Question

The drug neostigmine blocks the activity of the enzyme acetylcholinesterase in the synaptic cleft. Predict the effects of this drug.

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Textbook Question

Using 20 or fewer words, define each of the following terms in your own words.

b. Parasympathetic nervous system

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Textbook Question

Using 20 or fewer words, define each of the following terms in your own words.

a. Sympathetic nervous system

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Textbook Question

The sympathetic nervous system is also known as the ________ division because the cell bodies of its preganglionic neurons are located in the ________ .

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