Looking for assistance on these three quick questions as I can'tseem to figure them out. Thanks in advance for your help!

1. Which of the following would decrease the depth ofbreathing?

A. Increased arterial PCO2

B. Exercising

C. Increased action potential frequency in neurons from theventral respiratory group

D. Acidic plasma pH

E. Decreased action potential frequency in neurons from thedorsal respiratory group

F. Overactivation of the respiratory center in the medulla

2. Which of the following would make oxygen unloading inthe tissues more difficult?

Select all that apply

A. increased affinity of hemoglobin for oxygen

B. right shift of the oxyhemoglobin curve

C. lower blood pH

D. decreased metabolic rate

E. increased arterial PCO2

F. Left shift of the oxyhemoglobin curve

5. How does CO poisoning work?

A. CO inhibits the enzyme carbonic anhydrase (CA) and thereforeprevents CO2 from being transported as bicarbonate ions to thelungs for excretion

B. CO paralyzes the diaphragm and therefore prevents theexpansion of the lungs and ventilation

C. CO decreased hemoglobin oxygen saturation and prevents thedelivery of O2 to the tissues.

D. CO destroys hemoglobin and therefore prevents CO2 from beingtransported to the lungs for excretion

E. CO decreased the plasma solubility of O2 and prevents thedelivery of O2 to the tissues.