Which one of the following statements is correct about the human circulatory system?
(A) Blood transports only oxygen and not carbon dioxide.
(B) Human heart has five chambers.
(C) Valves ensure that the blood does not flow backwards.
(D) Both oxygen-rich and oxygen-deficient blood gets mixed in the heart.

In which of the following vertebrate group/groups,heart does not pump oxygenated blood to different parts of the body ?

In adult human heart valves that allow the flow of oxygenated blood are

Which of the following combines with haemoglobin in blood? (a) Carbon dioxide (b) carbon monoxide (c) oxygen (d) methane

Which of the following statement (s) is (are) true about heart? (i) Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs (ii) Left ventricle pumps oxygenated blood to different body parts while right ventrivle pumps deoxygenated blood to lungs (iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts (iv) Right atrium receives deoxygenated blood from different part of the body while left ventricle pumps oxygenated blood to dofferent parts of the body

Read the following statement carefully. A. The diffusion membrane is made up of three major cellular layers. B . The partial pressure of oxygen and carbon dioxide gases in mmHg are the same for both deoxygenated blood and tissue. Select correct option about the above statements .

Which of the following statements are true about amphibians? a. they are cold-blooded b. Respiration occurs through gills, skin and lungs. c. they are poikilotherms d. Respiration occurs only through gills and skin.

A balanced equation for combustion of methane is given below: CH_(4(g)) + 2O_(2(g)) to CO_(2(g)) + 2H_2O_(g) Which of the following statements is not correct on the basis of the above chemical equation? (A) one mole of CH4 reacts with 2 moles of oxygen to give one mole of CO2 (B) one molecule of CH4 reacts with 2 molecules of oxygen to give one molecule of CO2 and 2 molecules of water (C) 22.4L methane reacts with 44.8L of oxygen to give 44.8L of CO2 and 22.4L of water (D) 16g of methane reacts with 64g of O2 to give 44g of CO2 and 36g of water

Consider the given statements and select correct statement for transport of oxygen (a) seventy percent of oxygen is carried as bicarbonates (b) about ninty seven percent of oxygen is transported by RBCs in blood (c) it is carried by haemoglobin as carb-amino haemoglobin

Refer to the given diagrammatic representation of the transportation of oxygen and carbon dioxide in the blood. P, Q, R, S and T represent percentage of both gases in different forms. Select the correct option for P-T .

Assertion : There is no mixing of oxygenated and deoxygenated blood in the human heart. Reason : Valves are present in the heart which allows the movement of blood in one direction only.