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Chapter 11: Problem 2

According to the concept of dual innervation by the autonomic nervous system, if sympathetic activity inhibits pancreatic secretions, then the parasympathetic nervous system should a) Inhibit pancreatic secretions as well. b) Stimulate pancreatic secretions. c) Have no effect on pancreatic secretions.

Short Answer

Expert verified
b) Stimulate pancreatic secretions.

Step by step solution

01

Understanding Dual Innervation

The autonomic nervous system controls involuntary actions in the body and consists of two main components: the sympathetic and parasympathetic nervous systems. These two systems often have opposite effects on the same organ.
02

Identifying Sympathetic Effect on Pancreatic Secretions

It is given that the sympathetic activity inhibits pancreatic secretions. This means when the sympathetic nervous system is active, it reduces or stops the pancreas from releasing its digestive enzymes.
03

Determining Parasympathetic Influence

According to the dual innervation concept, if the sympathetic system has an inhibitory effect, the parasympathetic system will likely have the opposite, stimulating effect. Thus, the parasympathetic system is expected to stimulate pancreatic secretions.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Dual Innervation
The concept of dual innervation is an important feature of the autonomic nervous system. It means that most of our organs receive instructions from both parts of the autonomic nervous system: the sympathetic and parasympathetic systems. These two systems work together, but they usually have opposite effects on the same organ. This allows the body to respond to different situations effectively and maintain balance, a process known as homeostasis.
  • The sympathetic nervous system often prepares the body for 'fight or flight' by speeding up heart rate, restricting blood flow to non-essential organs, and more.
  • The parasympathetic nervous system, on the other hand, promotes 'rest and digest' activities, encouraging relaxation and digestion.
Because of these contrasting influences, dual innervation allows finely tuned control over organ functions.
Sympathetic Nervous System
The sympathetic nervous system is one half of the autonomic nervous system. It's often called the 'fight or flight' system because it prepares the body to react to stressful situations. When you need to run from danger or face a challenge, the sympathetic nervous system is at work.
  • Increases heart rate to circulate blood faster.
  • Pupils dilate to improve vision.
  • Inhibits processes not immediately needed, like digestion.
The inhibition of pancreatic secretions by the sympathetic system is part of its function to conserve energy and resources for critical activities by slowing down digestion.
Parasympathetic Nervous System
The parasympathetic nervous system forms the second component of the autonomic nervous system, known for promoting 'rest and digest.' It helps the body conserve and restore energy when there is no immediate threat. Unlike the sympathetic system, it encourages a state of calm and supports nutrient absorption and metabolism.
  • Decreases heart rate, promoting relaxation.
  • Stimulates digestive functions, including pancreatic secretion of enzymes required for digestion.
  • Enhances glandular activity, allowing the body to process food efficiently.
In the context of dual innervation, while the sympathetic system may inhibit pancreatic secretions to conserve energy, the parasympathetic system stimulates these secretions to aid digestion.
Pancreatic Secretions
Pancreatic secretions play a vital role in digestion. The pancreas releases enzymes that help break down carbohydrates, proteins, and fats in the digestive system. These secretions are crucial for processing foods into nutrients that the body can use.
  • Amylase helps digest carbohydrates.
  • Lipase aids in fat digestion.
  • Protease breaks down proteins into amino acids.
The dual innervation by the autonomic nervous system intricately controls pancreatic activities. The balance between the sympathetic and parasympathetic systems decides when and how much of these enzymes are secreted.
Involuntary Actions
Involuntary actions are activities performed by the body that do not require conscious control. They are crucial for maintaining life and health, functioning seamlessly without our awareness. These actions are mostly regulated by the autonomic nervous system.
  • Breathing, heart rate, and digestion are classic examples.
  • The dilation and contraction of blood vessels work without a need for conscious thought.
The autonomic nervous system ensures that these vital actions continue during various conditions, adjusting automatically according to the body's needs. Whether it's increasing heart rate during exercise or stimulating digestion while resting, involuntary actions keep the body running smoothly without deliberate management.

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