Exam 3 Study Guide: Fluid Balance, Vitamins, Minerals, Food Safety, and Food Systems

Q1. Osmosis: Water moves from an area of __________ solute concentration to an area of __________ solute concentration.

Background

Topic: Fluid and Electrolyte Balance

This question tests your understanding of osmosis, a key process in fluid balance where water moves across cell membranes in response to solute concentrations.

Key Terms and Concepts:

• Osmosis: The movement of water across a semipermeable membrane from an area of lower solute concentration to higher solute concentration.

• Solute: A substance dissolved in a solution (e.g., salts, sugars).

• Electrolyte: Minerals in body fluids that carry an electric charge (e.g., sodium, potassium).

Step-by-Step Guidance

1. Recall that water moves to balance solute concentrations on both sides of a membrane.

2. Think about which direction water will move if one side has more dissolved particles (higher solute concentration) than the other.

3. Fill in the blanks with the correct terms: "lower" and "higher" or "higher" and "lower" as appropriate.

Try solving on your own before revealing the answer!

Q2. If electrolyte concentration is higher outside the cell, the cell will:

Background

Topic: Fluid and Electrolyte Balance

This question is about how cells respond to changes in electrolyte concentration in their environment, which affects water movement and cell volume.

Key Terms and Concepts:

• Electrolyte: Charged minerals that affect fluid movement.

• Osmosis: Water moves toward higher solute (electrolyte) concentration.

Step-by-Step Guidance

1. Visualize a cell in a solution where the outside has more electrolytes than the inside.

2. Consider the direction water will move due to osmosis (toward higher solute concentration).

3. Think about what happens to the cell's size as water leaves or enters the cell.

Try solving on your own before revealing the answer!

Q3. Define solute:

Background

Topic: Basic Chemistry for Nutrition

This question asks you to recall the definition of a solute, which is important for understanding solutions in the body.

Key Terms:

• Solute: The substance dissolved in a solvent to form a solution.

Step-by-Step Guidance

1. Think about examples of solutions (e.g., salt water) and identify what is being dissolved.

2. Write a concise definition in your own words.

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Q4. Define electrolyte:

Background

Topic: Fluid and Electrolyte Balance

This question tests your understanding of what electrolytes are and why they are important in nutrition and physiology.

Key Terms:

• Electrolyte: A substance that dissociates into ions in solution and is capable of conducting electricity.

Step-by-Step Guidance

1. Recall examples of electrolytes (e.g., sodium, potassium, chloride).

2. Think about their role in nerve transmission, muscle contraction, and fluid balance.

3. Write a definition that includes their ability to conduct electricity in solution.

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Q5. Major functions of sodium:

Background

Topic: Sodium and Fluid Regulation

This question asks you to list the main roles sodium plays in the body, which are essential for understanding electrolyte balance and health.

Key Terms:

• Sodium: A major extracellular electrolyte involved in fluid balance, nerve transmission, and muscle function.

Step-by-Step Guidance

1. Recall the physiological processes that require sodium (e.g., maintaining fluid balance, nerve impulses).

2. List at least three major functions based on your notes or textbook.

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Q6. Sodium is / is not a major mineral in bone structure: __________________

Background

Topic: Sodium and Bone Health

This question tests your knowledge of which minerals are significant components of bone.

Key Terms:

• Major minerals in bone: Calcium and phosphorus are the primary minerals in bone structure.

Step-by-Step Guidance

1. Recall which minerals are stored in bone and their relative abundance.

2. Decide if sodium is considered a major structural mineral in bone.

Try solving on your own before revealing the answer!