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Human Systems 2/Human Structure and Function 2, T3 2025

Human Systems 2/Human Structure and Function 2, T3 2025

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Which ONE of the following statements regarding lower respiratory airways is MOST correct?

Smooth muscles are only in the wall of terminal bronchioles.

In adults the right main bronchus is more vertical than the left.

The bronchopulmonary segments are only based on the pulmonary arterial system.

The bronchioles contain cartilage.

Gas exchange takes place in the terminal bronchioles and acini.

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Which ONE of the following statements regarding CO₂ transport is correct?

Oxygenated blood can carry more CO₂ than deoxygenated blood.

Bicarbonate binds to hemoglobin.

Carbonic anhydrase in plasma converts most of the CO₂ to bicarbonate.

Hemoglobin counteracts an increase in blood pH by releasing H⁺ from red blood cells.

Most of the CO₂ is transported as carbamino compounds.

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Which ONE (OR MORE) of the following statements about the O₂-Hb equilibrium curve is/are correct?

The lower the P50, the lower the O₂ affinity.

❌

A steep lower portion of the curve aids O₂ diffusing into tissues.

57%

The shape of the curve is linear allowing for an increased O₂ affinity.

An increase in H⁺ concentration decreases affinity for oxygen.

✅

A higher PO₂ means a higher % Hb saturation.

✅

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Which ONE of the following statements about internal respiration is correct? It is the:

diffusion of CO₂ and O₂across membranes in the tissues.

100%

diffusion of HCO3^- out of the red blood cells.

binding of O₂ to hemoglobin.

movement of air from the atmosphere to the lungs.

gas exchange between the venous blood and the lungs.

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If gas X is 25% of a mixture of gases and the total pressure is 600 mmHg, what is the partial pressure of gas X?

150 mmHg

575 mmHg

138 mmHg

Identify the labeled structure.

Vocal fold

Hayoid bone

Epiglottis

Cricoid cartilage

Thyroid cartilage

Identify the labeled structure.

Vocal fold

Hayoid bone

Epiglottis

Cricoid cartilage

Thyroid cartilage

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