Biology Chapter 7: Gas Exchange and Myoglobin

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What is the approximate percentage of CO2 that diffuses into the blood plasma?

30%
90%
70% (correct)
50%

What is the role of carbonic anhydrase in the process of CO2 transport?

It catalyzes the formation of carbonic acid (correct)
It catalyzes the formation of bicarbonate ions
It catalyzes the formation of oxygen
It catalyzes the formation of water

What is the effect of chloride ion movement on the charge in the erythrocyte?

It reverses the charge in the cell
It keeps the charge in the cell constant (correct)
It decreases the negative charge
It increases the positive charge

At what Po2 is hemoglobin (Hb) approximately 70% saturated with oxygen?

40 mmHg (C) Signup and view all the answers

What is the characteristic of the oxygen dissociation curve for hemoglobin (Hb)?

It is S-shaped (C) Signup and view all the answers

What happens to the oxygen saturation of Hb when Po2 decreases?

It decreases (B) Signup and view all the answers

What is the primary function of hemoglobin in the lungs?

To bind oxygen (D) Signup and view all the answers

What is the result of the binding of oxygen to one subunit of hemoglobin?

The remaining subunits increase their affinity for oxygen (D) Signup and view all the answers

What percentage of carbon dioxide is transported in the blood as dissolved CO2?

7% (A) Signup and view all the answers

What is the name of the compound formed when carbon dioxide binds to the amino group of hemoglobin?

Carbamino-hemoglobin (D) Signup and view all the answers

In what environment does hemoglobin show high affinity for oxygen?

In an environment with high oxygen partial pressure (B) Signup and view all the answers

What is the primary function of carbamino-hemoglobin in the transport of carbon dioxide?

To transport carbon dioxide from the tissues to the lungs (A) Signup and view all the answers

What is the difference between the O2 dissociation curve for fetal hemoglobin and the O2 dissociation curve for adult hemoglobin?

The O2 dissociation curve for fetal hemoglobin is situated to the left of the O2 dissociation curve for adult hemoglobin. (B) Signup and view all the answers

What is the effect of increasing CO2 partial pressure on the pH of the blood at metabolically active tissues?

It decreases the pH, making the blood more acidic. (D) Signup and view all the answers

What is the function of myoglobin in muscles?

To store O2 and release it when Po2 falls very low (B) Signup and view all the answers

How does the O2 dissociation curve for myoglobin compare to the O2 dissociation curve for Hb?

It is situated to the left of the O2 dissociation curve for Hb (B) Signup and view all the answers

What is the effect of CO2 partial pressure on the oxygen dissociation curve of Hb?

It shifts the curve to the right (A) Signup and view all the answers

What is the advantage of fetal hemoglobin's higher affinity towards O2?

It ensures the fetus receives a supply of O2 from the mother's blood when Po2 is low in the uterus (C) Signup and view all the answers