Problem 13 - Anatomy and Physiology of Animals

Question

Which functional division of the nervous system would be responsible for the physiological changes seen during exercise (e.g., increased heart rate and sweating)? a. somatic b. autonomic C. enteric d. central

Step-by-Step Solution

Answer

The autonomic nervous system (Option b) is responsible for these changes.

Step 1: Understand the Question

The question is asking about which part of the nervous system is responsible for bodily changes during exercise, such as increased heart rate and sweating.

Step 2: Identify Physiological Changes During Exercise

During exercise, there are several physiological changes including increased heart rate, increased breathing rate, sweating, and redistribution of blood to the muscles.

Step 3: Differentiate Between Divisions of the Nervous System

There are several divisions of the nervous system: - **Somatic**: Controls voluntary movements and transmits sensory information. - **Autonomic**: Oversees involuntary functions like heart rate, digestion, and sweating. - **Enteric**: Governs functions of the gastrointestinal system. - **Central**: Comprises the brain and spinal cord, processing information and issuing commands.

Step 4: Match Physiological Changes to Nervous System Division

The autonomic nervous system is responsible for involuntary functions, which include the changes seen during exercise such as increased heart rate and sweating.

Step 5: Conclusion

Based on the roles of different divisions, the functional division responsible for the physiological changes during exercise is the autonomic nervous system.

Key Concepts

Physiological Changes During Exercise

When you exercise, your body undergoes several noticeable changes. These changes are the body's response to the increased demands being placed on it. A few of these include:

• Increased Heart Rate: As you begin to exercise, your heart pumps faster to deliver more oxygen-rich blood to your muscles.
• Increased Breathing Rate: Your breathing becomes more rapid and deeper, helping to bring in more oxygen and expel carbon dioxide.
• Sweating: Your body produces sweat to cool down as your internal temperature rises.
• Redistribution of Blood: Blood flow is directed towards the muscles that are being used and away from non-essential areas, like the digestive system.

These changes ensure that your body is capable of sustaining physical activity for a longer period. They are crucial for maintaining performance and minimizing fatigue.

Nervous System Divisions

The nervous system is a complex network responsible for sending, receiving, and processing nerve impulses throughout the body. It is divided into several key parts:

• Somatic Nervous System: This is responsible for voluntary movements and transmitting sensory information to the central nervous system. Whenever you decide to move a muscle, it's the somatic system at work.
• Autonomic Nervous System: This division controls involuntary functions. These include vital activities such as regulation of the heart rate, digestion, respiratory rate, and reflex actions like coughing or sneezing. This system operates largely below the level of consciousness.
• Enteric Nervous System: Sometimes considered part of the autonomic system, this division manages functions of the gastrointestinal tract.
• Central Nervous System: Made up of the brain and spinal cord, it acts as the control center, processing information and sending out commands. It integrates sensory information and coordinates the body's response.

Together, these divisions allow the nervous system to manage both voluntary and involuntary processes crucial for life.

Involuntary Functions During Exercise

Involuntary functions, as the name suggests, occur without conscious control. These are pivotal during exercise because they allow the body to adapt seamlessly to increased activity demands. The autonomic nervous system, in particular, plays a vital role here. It is divided further into two parts:

• Sympathetic Nervous System: Often referred to as the "fight or flight" system, it prepares the body for intense physical activity. It increases heart rate, enlarges air passages to the lungs, and stimulates sweating to cool the body.
• Parasympathetic Nervous System: Sometimes called the "rest and digest" system, it works to bring the body back to a state of calm after activity, though it has less direct effects during exercise itself.

The activation of the sympathetic system is crucial during exercise as it ensures that organs and muscles receive the nutrients and oxygen they need to perform effectively. Without these involuntary processes, maintaining and optimizing physical activity would be challenging.