Question

Looking for assistance on these three quick questions as I can't seem to figure them out. Thanks in advance for your help!

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

A. Increased arterial PCO2

B. Exercising

C. Increased action potential frequency in neurons from the ventral respiratory group

D. Acidic plasma pH

E. Decreased action potential frequency in neurons from the dorsal respiratory group

F. Overactivation of the respiratory center in the medulla

2. Which of the following would make oxygen unloading in the 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 therefore prevents CO2 from being transported as bicarbonate ions to the lungs for excretion

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

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

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

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

Answer 1

Answer :

1. E . decreased action potential frequency in neurons from the dorsal respiratory group.

2. A, Increased affinity of haemoglobin for oxygen

D, Decreased metabolic rate

F. Left shift of the oxyhaemoglobin curve.

Factors that move the oxygen dissociation curve to the right are those physiological states where tissued need more oxygen. For example, during exercise, muscles have a higher metabolic rate, and consequently need more oxygen , produce more carbondioxide and lactic acid, and their temparature rises.  

5. CO decreased haemoglobin oxygen saturation and prevents the delivery of oxygen to the tissues.

Carbon monoxide produces anaemic hypoxia.Because its binds to the hbwith such high affinity, preventing oxygen from binding, it reduces the oxygen carrying capacity of the blood. The tissue do not get sufficient oxygen to maintain their metabolic needs because the blood is not carrying it.