Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart2h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

3. Energy & Cell Processes

Enzymes

Anatomy & Physiology

3. Energy & Cell Processes

Enzymes

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Multiple Choice

Which of the following statements correctly describe(s) the role or roles of heat in biological reactions?

Heat from the environment is necessary for substrates to get over the activation energy barrier.

The kinetic energy of the substrates is increased as the amount of heat in the system is increased.

Increasing the amount of heat in a system will always increase the rate of enzyme-catalyzed reactions.

The second and third choices are correct.

The first and second choices are correct.

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Verified step by step guidance

Understand the concept of activation energy: Activation energy is the minimum amount of energy required for a chemical reaction to occur. In biological systems, enzymes often lower the activation energy needed for reactions.

Evaluate the first statement: Heat from the environment can provide the energy needed for substrates to overcome the activation energy barrier, making it a correct statement.

Analyze the second statement: Increasing heat in a system raises the kinetic energy of substrates, which can lead to more frequent and energetic collisions between molecules, supporting the second statement.

Consider the third statement: While heat can increase reaction rates, enzyme-catalyzed reactions have an optimal temperature range. Excessive heat can denature enzymes, reducing their effectiveness, making this statement incorrect.

Conclude with the correct answer: Based on the analysis, the first and second choices are correct, as they accurately describe the role of heat in biological reactions.