Q1. Define “body fluids” and give 3-4 examples.

Background

Topic: Body Fluid Compartments

This question tests your understanding of what constitutes body fluids and your ability to identify specific examples found in the human body.

Key Terms:

• Body fluids: Liquids within the body that contain dissolved substances and are essential for physiological processes.

• Examples may include fluids found inside and outside cells.

Step-by-Step Guidance

1. Start by defining what is meant by "body fluids" in the context of human anatomy and physiology.

2. Think about the major locations where fluids are found in the body (e.g., inside cells, in blood vessels, between cells).

3. List 3-4 specific examples of body fluids, considering both intracellular and extracellular fluids.

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Q2. Discuss functions of water in the body.

Background

Topic: Water in Physiology

This question assesses your knowledge of the various roles water plays in maintaining homeostasis and supporting life processes.

Key Concepts:

• Water as a solvent

• Water in temperature regulation

• Water in transport and chemical reactions

Step-by-Step Guidance

1. Identify at least three major functions of water in the human body.

2. For each function, briefly explain how water contributes to that physiological process (e.g., dissolving substances, regulating temperature).

3. Consider how water supports both cellular and systemic functions.

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Q3. Explain the difference between an electrolyte and nonelectrolyte.

Background

Topic: Electrolytes vs. Nonelectrolytes

This question tests your understanding of the chemical properties of substances dissolved in body fluids and their physiological significance.

Key Terms:

• Electrolyte: A substance that dissociates into ions in solution and conducts electricity.

• Nonelectrolyte: A substance that does not dissociate into ions in solution and does not conduct electricity.

Step-by-Step Guidance

1. Define what an electrolyte is and provide an example (e.g., NaCl).

2. Define what a nonelectrolyte is and provide an example (e.g., glucose).

3. Explain why electrolytes can conduct electricity in solution, while nonelectrolytes cannot.

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Q4. Define acid, base, and buffer system. Give the pH scale range of an acid and a base.

Background

Topic: Acid-Base Balance

This question assesses your understanding of acids, bases, buffer systems, and the pH scale in the context of physiology.

Key Terms and Ranges:

• Acid: A substance that donates hydrogen ions () in solution.

• Base: A substance that accepts hydrogen ions or donates hydroxide ions ().

• Buffer system: A system that minimizes changes in pH by absorbing or releasing ions.

• pH scale: Ranges from 0 (most acidic) to 14 (most basic); acids have pH < 7, bases have pH > 7.

Step-by-Step Guidance

1. Define what an acid is and state the pH range for acids.

2. Define what a base is and state the pH range for bases.

3. Explain what a buffer system does in the body.

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Q5. Name the two main body fluid compartments and give examples.

Background

Topic: Fluid Compartments

This question tests your knowledge of how body fluids are distributed and examples of each compartment.

Key Terms:

• Intracellular fluid (ICF): Fluid inside cells.

• Extracellular fluid (ECF): Fluid outside cells, including plasma and interstitial fluid.

Step-by-Step Guidance

1. Identify the two main compartments where body fluids are found.

2. Give at least one example of each compartment (e.g., cytosol for ICF, plasma for ECF).

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Q6. Which ions or solutes are higher in the ECF vs. ICF?

Background

Topic: Electrolyte Distribution

This question tests your understanding of the distribution of key ions between extracellular and intracellular compartments.

Key Ions:

• Common ECF ions: , ,

• Common ICF ions: , ,

Step-by-Step Guidance

1. List the major ions found in higher concentrations in the ECF.

2. List the major ions found in higher concentrations in the ICF.

3. Think about the role of the sodium-potassium pump in maintaining these gradients.

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Q7. Explain what happens to a cell when placed into a hypotonic or hypertonic solution.

Background

Topic: Osmosis and Tonicity

This question tests your understanding of how water moves across cell membranes in response to different solute concentrations.

Key Terms:

• Hypotonic solution: Lower solute concentration than the cell.

• Hypertonic solution: Higher solute concentration than the cell.

• Osmosis: Movement of water across a semipermeable membrane.

Step-by-Step Guidance

1. Describe what happens to water movement when a cell is placed in a hypotonic solution.

2. Describe what happens to water movement when a cell is placed in a hypertonic solution.

3. Explain the consequences for the cell in each scenario (e.g., swelling or shrinking).

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Q8. Explain the difference between hydrostatic pressure gradient and osmotic pressure gradient.

Background

Topic: Fluid Movement Across Membranes

This question tests your understanding of the forces that drive fluid movement in the body.

Key Terms:

• Hydrostatic pressure: The force exerted by a fluid against a wall or membrane.

• Osmotic pressure: The force exerted by solutes drawing water across a membrane.

Step-by-Step Guidance

1. Define hydrostatic pressure and describe its role in fluid movement.

2. Define osmotic pressure and describe its role in fluid movement.

3. Compare and contrast how each pressure gradient affects the movement of water across capillary walls.

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Q9. What condition does the body suffer from when overhydration occurs and define that condition?

Background

Topic: Fluid Imbalances

This question tests your knowledge of the consequences of excessive water intake and the resulting physiological condition.

Key Terms:

• Overhydration: Also known as water intoxication or hypotonic hydration.

• Hyponatremia: Low sodium concentration in the blood due to dilution.

Step-by-Step Guidance

1. Identify the term for the condition caused by overhydration.

2. Define the condition and describe what happens to sodium levels in the blood.

3. Explain the potential consequences for cells and the nervous system.

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Q10. During severe dehydration, what can happen to cells which can be fatal due to it causing water & electrolyte imbalances?

Background

Topic: Dehydration and Cellular Effects

This question tests your understanding of the dangers of dehydration at the cellular level.

Key Concepts:

• Water loss from cells

• Electrolyte imbalances

Step-by-Step Guidance

1. Consider what happens to the osmotic balance when the body loses too much water.

2. Describe the movement of water in and out of cells during dehydration.

3. Explain the potential consequences for cell function and survival.

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Q11. Is there a difference between hyperkalemia and hypercalcemia? If yes, what is the difference?

Background

Topic: Electrolyte Imbalances

This question tests your ability to distinguish between two different electrolyte disorders and their effects.

Key Terms:

• Hyperkalemia: Elevated potassium () levels in the blood.

• Hypercalcemia: Elevated calcium () levels in the blood.

Step-by-Step Guidance

1. Define hyperkalemia and its effects on the body.

2. Define hypercalcemia and its effects on the body.

3. Compare the two conditions and state whether they are the same or different.

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Q12. What is the difference between hypernatremia and hyponatremia, and what do they cause?

Background

Topic: Sodium Imbalances

This question tests your understanding of sodium disorders and their physiological effects.

Key Terms:

• Hypernatremia: High sodium concentration in the blood.

• Hyponatremia: Low sodium concentration in the blood.

Step-by-Step Guidance

1. Define hypernatremia and describe its effects on cells and the body.

2. Define hyponatremia and describe its effects on cells and the body.

3. Explain the causes and symptoms of each condition.

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Q13. What are the 3 main sites that store calcium in the body?

Background

Topic: Calcium Storage

This question tests your knowledge of where calcium is stored in the body and its physiological importance.

Key Sites:

• Bones

• Teeth

• Small amounts in blood plasma and soft tissues

Step-by-Step Guidance

1. List the primary storage site for calcium in the body.

2. Identify two other locations where calcium is stored or found in significant amounts.

3. Consider the role of these sites in calcium homeostasis.

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Q14. Name two antagonistic hormones that regulate calcium (one increases & the other decreases calcium levels).

Background

Topic: Hormonal Regulation of Calcium

This question tests your knowledge of endocrine control of calcium homeostasis.

Key Hormones:

• Parathyroid hormone (PTH)

• Calcitonin

Step-by-Step Guidance

1. Identify the hormone that increases blood calcium levels.

2. Identify the hormone that decreases blood calcium levels.

3. Briefly describe how each hormone affects calcium homeostasis.

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Q15. If hypercalcemia causes neurons to become less permeable to Na+, which diminishes a neuron’s ability to depolarize, what is the overall effect on the neuron?

Background

Topic: Calcium and Neuronal Function

This question tests your understanding of how calcium levels affect neuronal excitability.

Key Concepts:

• Depolarization and action potentials

• Role of sodium permeability in neuron firing

Step-by-Step Guidance

1. Recall how sodium influx is necessary for neuron depolarization and action potential generation.

2. Consider what happens if sodium cannot enter the neuron as easily.

3. Predict the effect on neuronal excitability and communication.

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Q16. What hormones influence the balance of calcium and phosphate ions?

Background

Topic: Hormonal Regulation of Minerals

This question tests your knowledge of the hormones that regulate both calcium and phosphate levels in the body.

Key Hormones:

• Parathyroid hormone (PTH)

• Calcitriol (active vitamin D)

• Calcitonin

Step-by-Step Guidance

1. List the hormones that regulate calcium and phosphate balance.

2. Briefly describe the effect of each hormone on calcium and phosphate levels.

3. Consider how these hormones interact to maintain homeostasis.

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Q17. Explain the principle of mass balance.

Background

Topic: Homeostasis and Mass Balance

This question tests your understanding of how the body maintains stable levels of substances.

Key Concept:

• Mass balance: The amount of a substance gained must equal the amount lost to maintain homeostasis.

Step-by-Step Guidance

1. Define the principle of mass balance in your own words.

2. Give an example of how the body applies this principle (e.g., water, electrolytes).

3. Explain why this principle is important for homeostasis.

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Q18. Why is calcium such an important mineral?

Background

Topic: Calcium Functions

This question tests your understanding of the physiological roles of calcium in the body.

Key Functions:

• Bone and teeth structure

• Muscle contraction

• Nerve impulse transmission

• Blood clotting

Step-by-Step Guidance

1. List at least three important functions of calcium in the body.

2. Briefly explain how calcium contributes to each function.

3. Consider both structural and regulatory roles of calcium.

Try solving on your own before revealing the answer!