9. Where is O2-Hb affinity lowest? ---lungs ---high metabolic tissues ---low met
ID: 3524370 • Letter: 9
Question
9. Where is O2-Hb affinity lowest?
---lungs
---high metabolic tissues
---low metabolic tissues
10. Which of the following stimuli would NOT NORMALLY trigger an increase in breathing rate, cardiac output, and blood pressure?
---increased blood [H+]
--increased PCO2
---decreased blood pH
---decreased PO2
5. The most common types of capillaries:
-are very leaky, allowing proteins and red blood cells to pass
-have fenestrations
--do not allow proteins to pass across the endothelium
---have an elastic tunica externa
---do not engage in pinocytosis
6. Most arteries and arterioles constrict in response to sympathetic activation; while arterioles serving muscle and heart dilate in response to sympathetic activation; because
---arterioles to muscle/heart do not receive sympathetic innervation
---NE is used on most arterioles, while E is used on arterioles to muscle/heart.
---the smooth muscle of these different arterioles have different adrenergic receptors
Explanation / Answer
Ans 9 oxygen - haemoglobin affinity is lowest for high metabolic tissues because high metabolic tissues require more oxygen in their red blood cell .So we respire more eg.at the time of exercise So more oxygen will enter in red blood cell .The end product of RBCs is 2,3-bisphospate glycerate which ultimately increases the concentration of 2,3biphosphate glycerate in the high metabolic tissues .Due to the increase in the concentration of 2,3,-biphospate glycerate it decreases the affinity of oxygen for haemoglobin.
Ans 10 decreased pO2 will does not have direct effect on respiratory centres present in brain .Increased blood (H+) in the body ,increased pCO2,decreased blood pH will stimulate the chemoreceptors and the pnemotaxice area of brain which can increase or decrease the rate of breathing ,cardiac output and blood pressure according to the situation .Only pO2 will does not have direct effect.
Ans 5 The most common types of capillaries are very leaky allowing proteins and RBC to pass because it's an important function of capillary The junctions present in common capillary allow the molecule to pass through them although tight junctions but they are incomplete leaky and impermeable thus allow most of the molecule to pass through them.common capillaries doesn't have fenestration .fenestration are present in fenestrated capillaries.common capillaries does not have tunica externa .They consist of tunica intima only.common capillaries are involved in pinocytosis.
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