1.4 Quiz

What are the basic needs of cells in the human body?

• Access to oxygen, source of glucose, balanced fluid environment, removal of waste

• Access to sunlight, source of protein, balanced pH environment, removal of toxins

• Access to carbon dioxide, source of fats, balanced temperature environment, removal of oxygen

• Access to nitrogen, source of vitamins, balanced pressure environment, removal of nitrogen waste

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What percentage of molecules in a breath of air are oxygen molecules?

• 21%

• 78%

• 5%

• 10%

What is the role of hemoglobin in the transport of oxygen?

• It acts as a barrier to prevent too many O2 molecules from entering a red blood cell.

• It converts O2 molecules into carbon dioxide for easier expulsion from the body.

• It uses iron to help bind to O2 molecules, allowing red blood cells to carry approximately 1 billion oxygen molecules.

• It breaks down O2 molecules to be absorbed by the bloodstream more easily.

Why does the heart function as a double pump?

• To ensure blood is oxygenated in the lungs before being pumped throughout the body at a high pressure.

• To double the amount of blood that can be pumped with each heartbeat.

• To create a backup system in case one pump fails.

• To separate oxygenated and deoxygenated blood more efficiently.

What would happen if there was no heart?

• The body would rely on diffusion alone, which would be sufficient for survival.

• Blood would not be able to circulate, causing immediate cessation of all bodily functions.

• Blood pressure would increase uncontrollably, leading to widespread organ failure.

• Oxygen would take a long time to reach distant parts of the body, leading to cell death.

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What is the primary function of the lungs in the respiratory system?

• To cool down the air to body temperature before it enters the bloodstream.

• To filter out impurities from the air before it enters the bloodstream.

• To convert carbon dioxide back into oxygen for reuse by the body.

• To allow oxygen molecules to continue their journey from the gas phase into a new liquid phase and be absorbed into the bloodstream.

Why are there two ventricles in the heart?

• To allow the heart to beat more loudly and be heard without a stethoscope.

• To manage the different pressures needed for pulmonary and systemic circulation.

• To provide a backup system in case one ventricle fails.

• To increase the heart's capacity for blood storage.

What is the significance of the pressure changes in the heart's ventricles?

• They are necessary to move blood through the resistance of the body's network of blood vessels.

• They indicate the health and fitness level of an individual.

• They are used to measure the emotional state of a person.

• They determine the blood type of an individual.

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What would be the consequence of having a single ventricle with high pressure?

• The body would adapt by reducing the number of capillaries.

• Blood circulation would be too slow, leading to chronic fatigue.

• The heart would become more efficient, reducing the risk of heart diseases.

• Fluid would get pushed out of the capillaries into the lungs, and some capillaries would break.

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How does the structure of the lungs facilitate the exchange of gases?

• The alveoli are surrounded by a network of blood vessels, allowing for efficient diffusion of oxygen into the blood and carbon dioxide out.

• The lungs filter and purify the air, ensuring only oxygen reaches the alveoli.

• The lungs warm the air to body temperature, increasing the rate of gas exchange.

• The lungs produce a special enzyme that converts atmospheric nitrogen into oxygen.