RESPIRATORY QUIZ

The majority of carbon dioxide is transported in plasma as:

• carboxyhemoglobin

• carbonic acid

• carboaminohemoglobin

• bicarbonate ion

Which of the following statments about CO₂ is INCORRECT?

• Hypoventilation increases its concentration in the blood

• There is more CO₂ dissolved in the blood plasma than is carried in the RBCs.

• Concentration of CO₂ is greater in systemic venous blood than pulmonary venous blood.

• When it accumulates in the blood, pH will decrease

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-5

Select the correct statement about oxygen transport in blood.

• If blood returning to the lungs has a 50% oxygen saturation level, it could indicate increased tissue metabolism.

• A molecule of hemoglobin returning to the lungs during normal activity would carry one molecule of O2.

• When a patient is in acidosis, hemoglobin is able to carry oxygen more efficiently.

• When H+ levels are increased, RBCs have increased oxygen-carrying capacity.

The chemoreceptors in the aorta are most sensitive to changes in blood:

• O₂ concentration

• H⁺ concentration

• CO₂ concentration

Tags

NGSS.HS-LS1-3

During normal breathing, what is the stimulus for increasing breathing rate and depth?

• decreased oxygen level in the blood 

• increased carbon dioxide levels in the blood 

• increased blood pH 

• decreased hydrogen ion levels in the blood 

Tags

NGSS.HS-LS1-3

Why are the effects of CO₂ and H⁺ on breathing are similar?

• both are positively charged ions

• both elevate pH levels

• CO₂ combines with water to form H₂CO₃ which releases H⁺

• H⁺ combines with water to form CO₂

The amount of oxygen released from hemoglobin increases:

• during hypercapnia

• when CO₂ concentration increases

• if pyrogens are released

• if blood becomes more acidic

The dorsal and ventral respiratory groups are located in the:

• cerebellum

• thalamus

• hypothalamus

• medulla oblongata

Atmospheric pressure is around _______ mmHg.

Cutting the phrenic nerve will result in:

• Paralysis of the epiglottis

• Air entering the pleural cavity

• Stimulation of the diaphragmatic reflex

• Paralysis of the diaphragm