Question

Which of the following is NOT an end-product of digestion?

	polysaccharides
	glucose
	amino acids
	fatty acids
	nucleotide bases Oxygen is mostly transported through the body dissolved in the blood. dissolved in red blood cells. bound to hemoglobin. bound to dissolved iron. bound to carbon.

Which of the following substances is never secreted in the nephron?

	uric acid
	drug metabolites
	hydrogen ions
	potassium ions
	glucose

Question

5 of 30

The one-way flow of blood in veins is maintained by ______________.

	positive pressure from the chest cavity
	blood pressure
	muscles pressing against the veins
	their thick walls
	valves

Answer 1

1) Nucleotide Bases : These are not End Products of digestion because these are Purines(Adenine,Guanine) and Pyrimidines (Thymidine ,Cytosine) which are present in the DNA and RNA only and are not part of digestive system and Rest all are end products of digestion.

2) Oxygen is often transported Through the Body by binding to Haemoglobin. Oxygen reacts with Haemoglobin to form Oxy Haemoglobin.

Hb + O2 ------------->HbO2 .

Nearly 97 % of the Oxygen transportation is by binding to Heam part of Heamoglobin (Heam means Iron ).

3) Glucose :  It is never secreted in the Nephron because generally the glucose is reabsorbed by the Nephron to constantly maintain the plasma concentrations. In case if it is not reabsorbed it leads to Glycosuria ( A type of Diabetes )

4) Valves : Valves are the One which prevents the backward Flow of the Blood . Pulmonary valve prevent s the backflow of blood into right ventricle after it is contracted whereas Aortic valve prevents the blood back flow into left ventricle after Contraction