DSA: Respiratory Adaptations

Question 1

A patient comes in with suspected exposure to cyanide. You, a good student doctor assume Histotoxic Hypoxia is causing respiratory issues. Which of the following correctly describes Histotoxic Hypoxia?

A. Lungs are impaired and unable to exchange gas

B. Blood is unable to transport oxygen to tissues due to some defect in the RBCs

C. Lungs, blood, circulation are all fine but the tissues are unable to use oxygen

D. The heart is unable to pump oxygen affectively

Answer 1

Lungs, blood, circulation are all fine but the tissues are unable to use oxygen

Question 2

Which of the following types of hypoxia would CO poisoning cause?

A. Circulatory Hypoxia

B. Hypoxic Hypoxia

C. Anemic Hypoxia

D. Histotoxic Hypoxia

Answer 2

Anemic Hypoxia

• the lungs can work just fine, but exposure to CO prevents the blood from carrying O2

Question 3

What happens to barometric pressure and oxygen concentration with increased altitude?

A. Barometric pressure and oxygen % (FIO2) increase

B. Barometric pressure and oxygen % (FIO2) decrease

C. Barometric pressure increases while oxygen % decreases

D. Barometric pressure decreases while oxygen % increases

E. Barometric pressure decreases while oxygen % stays the same

Answer 3

Barometric pressure decreases while oxygen % stays the same

Question 4

Overtime, a decrease in barometric pressure causes which of the followng?

A. Increases ventillation and thus increase PaO2

B. Increased erythropoietin from the kidneys

C. Increase number and size of mitochondria

D. None of the above

E. All except D

Answer 4

A. Increases ventillation and thus increase PaO2

B. Increased erythropoietin from the kidneys

C. Increase number and size of mitochondria

Question 5

T/F: Under conditions of increased barometric pressure, we get too much gas in our system, especially O2 which can lead to oxygen toxicity

Answer 5

True