Question

Question 1.

Which of the following conditions will result in vasodilation of the arterioles?

A. increase H+; decrease O2; increase CO2

B. decrease H+; decrease O2; increase CO2

C. increase H+; increase CO2; increase O2

D. decrease H+; increase O2; increase CO2

Question 2

Which of these is demonstrated by the oxygen-hemoglobin dissociation curve?

		The greater the PO2 of the blood, the greater the dissociation of O2 from hemoglobin?
		At normal resting systemic arterial PO2, hemoglobin is almost 100% saturated with oxygen
		At normal resting systemic venous PO2, only about 75% of the hemoglobin is in the form of deoxyhemoglobin
		More additional oxygen binds to hemoglobin when going from a PO2 of 60 to 80 mm Hg, than is added when going from a PO2 of 20 to 40 mmHg
		As PO2 increases, the saturation of hemoglobin with oxygen increases linearly

Answer 1

1. Answer ; B) decrease H+ ions, decrease O2, Incresae CO2.

Reason , When the level of oxygen in our body get reduced, the volume of CO2 would be greater. There are many factors that are associated with these condition. Whenever CO2 level is in high, the H+ ions level would get reduced. All these process are occured to balance the oxygen level and maintain hemostasis in our body. Vasodilation, which is referred in the given statement is the issue of this changes and this proces would retrive the level of O2 in our body. Hence the above mentioned option would be the right answer.

2. Answer ; At normal resting systemic arterial PO2, hemoglobin is almost 100% saturated with oxygen.

Reason ; The mentioned curve helps to know abou the relationship between two main factors such as partial pressure of the oxygen and the Hemoglobin saturation level. The cure can move to right and left according to the oxygen affinity of the hemoglobin. Among the given option, the above mentioned option clearly explains the actual physiology that can be explained through this curve. The oxygen content is seen high on arterial circulation rather than the venous circulation and the affinity level of 96 to 98 % would be considered as complete saturation, hence when the normal range of PO2 occurs, almost 100% of oxygen get saturated, and very less proportion will be dissolved in the solution. Hence the above mentioned option is the most appropriate one.