8.1 Thermoregulation

Thermoregulation is the maintenance of internal temperature within a range that allows cells to function efficiently. Heat is produced inside the body as a byproduct of metabolic reactions. The main purpose of thermoregulation is to keep the enzyme systems of the body working properly.

Definition

Thermoregulation: Thermoregulation is defined as the maintenance of internal temperature within a range that allows cells to function efficiently.

Main Idea

• Heat is produced inside the body as a byproduct of metabolic reactions.
• Heat production occurs more generally in the organs of the body.
• Since heat is a byproduct of metabolism, the amount of heat produced depends on metabolic rate.
• Humans, like most mammals, can maintain a constant body temperature despite changes in the surroundings.
• The core temperature of the human body remains reasonably constant at 37°C.
• It can fluctuate by a degree or so, more during fever, but it is generally very stable.
• The main purpose of thermoregulation is to keep the enzyme systems of the body working properly.
• Temperature colder or warmer than the enzymes optimum range changes the shape of the active site and chemical reactions stop.

Core Concept

• Thermoregulation = maintenance of internal temperature
• **Core temperature** = 37°C
• Heat production = byproduct of metabolic reactions
• Metabolic rate = determines heat production
• Purpose = keep enzyme systems working properly
• Enzyme optimum range = essential for chemical reactions

Detailed Explanation

Thermoregulation

• Humans, like most mammals can maintain a constant body temperature, despite changes in the surroundings.
• The core temperature of the human body remains reasonably constant at 37°C.
• It can fluctuate by a degree or so, more during fever, but it is generally very stable.

Thermoregulation and Its Needs

• Heat is produced inside the body as a byproduct of metabolic reactions.
• Heat production occurs more generally in the organs of the body.
• Since heat is a byproduct of metabolism, the amount of heat produced depends on metabolic rate.
• Thermoregulation is defined as the maintenance of internal temperature within a range that allows cells to function efficiently.
• The body works to maintain a stable internal temperature.
• Temperature colder or warmer than the enzymes optimum range, changes the shape of the active site and chemical reactions to stop.
• The main purpose of thermoregulation is to keep the enzyme systems of the body working properly.

Summary Table of Thermoregulation

Intermediate Level

Thermoregulation

Needs of Thermoregulation

Formula / Mathematical Form

Not applicable to this topic.

Solved Example

Not applicable to this topic (descriptive topic).

Important Points

• 1. Thermoregulation is maintenance of internal temperature.
• 2. It allows cells to function efficiently.
• 3. Heat is produced as byproduct of metabolic reactions.
• 4. Heat production occurs in organs.
• 5. Amount of heat produced depends on metabolic rate.
• 6. Humans can maintain constant body temperature.
• 7. Core temperature remains constant at 37°C.
• 8. It can fluctuate by a degree or so.
• 9. It is generally very stable.
• 10. Main purpose is to keep enzyme systems working.
• 11. Enzymes have an optimum temperature range.
• 12. Temperature outside optimum range changes active site.
• 13. Chemical reactions stop if temperature is wrong.
• 14. Body works to maintain stable internal temperature.
• 15. Thermoregulation is essential for survival.

Remember

• - Thermoregulation = maintenance of internal temperature
• - **Core temperature** = 37°C
• - Heat production = byproduct of metabolic reactions
• - Metabolic rate = determines heat production
• - Purpose = keep enzyme systems working properly
• - Enzyme optimum range = essential for chemical reactions

Common Mistakes

• 1. Thinking body temperature is always exactly 37°C — It can fluctuate slightly.
• 2. Forgetting the role of enzymes — Enzymes need optimal temperature.
• 3. Mixing up thermoregulation and homeostasis — Thermoregulation is a part of homeostasis.
• 4. Believing heat production is constant — It depends on metabolic rate.
• 5. Thinking thermoregulation is only about cooling — It is about both heating and cooling.
• 6. Forgetting the role of the hypothalamus — It is the control centre.
• 7. Mixing up fever and hyperthermia — Fever is regulated; hyperthermia is unregulated.
• 8. Believing thermoregulation is not important — It is essential for survival.
• 9. Mixing up hypothermia and hyperthermia — Hypo = low; hyper = high.
• 10. Forgetting the role of thermoreceptors — They detect temperature changes.

Quick Revision

Humans, like most mammals can maintain a constant body temperature, despite changes in the surroundings. The core temperature of the human body remains reasonably constant at 37°C. It can fluctuate by a degree or so, more during fever, but it is generally very stable. Heat is produced inside the body as a byproduct of metabolic reactions. Heat production occurs more generally in the organs of the body. Since heat is a byproduct of metabolism, the amount of heat produced depends on metabolic rate. Thermoregulation is defined as the maintenance of internal temperature within a range that allows cells to function efficiently. The body works to maintain a stable internal temperature. Temperature colder or warmer than the enzymes optimum range, changes the shape of the active site and chemical reactions to stop. The main purpose of thermoregulation is to keep the enzyme systems of the body working properly.

60-Second Revision

• Thermoregulation = maintenance of internal temperature
• Core temperature = 37°C
• Heat production = byproduct of metabolic reactions
• Metabolic rate = determines heat production
• Purpose = keep enzyme systems working properly
• Enzyme optimum range = essential for chemical reactions
• Warning: Temperature outside the enzyme's optimum range changes the active site and stops chemical reactions

NEXT TOPIC

• Chapter:
• 8. Thermoregulation and Homeostasis

• Topic:
• 8.1.1 THERMOREGULATION AND ITS NEEDS

Source: