Body Fluids and...

Read the following statements carefully.
(i) In fishes the heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body parts from where deoxygenated blood is returned to the heart.
(ii) The openings of the right and the left ventricles into pulmonary artery and aorta respectively are provided with the mitral valves.
(iii) The nodal musculature has the ability to generate action potentials without any external stimuli, i.e., it is autoexcitable.
(iv) The T-wave of ECG represents depolarisation of the ventricles.
Which of the above two statements are incorrect?

Which of the following options has the correct pair of nephron parts that maintain $$pH$$ and ionic balance of blood? 

Which of the following is the diagrammatic representation of standard electrocardiogram(ECG)?

The given figure is the ECG of a normal human. Which one of its components is correctly interpreted below?

A red blood cell, entering the right side of the heart passes by or through the following structures. 
1. Atrioventricular valves
2. Semilunar valves
3. Right atrium
4.Right ventricle
5. SAN
Which of the following options represents the correct sequence?

Which of the following statements is correct?

Mark the pair of substances among the following which is essential for coagulation of blood.

Given below are four statements (i-iv) regarding human blood circulatory system.
i. Arteries are thick-walled and have narrow lumen as compared to veins.
ii. Angina is acute chest pain when the blood circulation to the brain is reduced.
iii. Persons with blood group AB can donate blood to. any person with any blood group under ABO system.
iv. Calcium ions play a very important role in blood clotting.
Which two of the above statements are correct?

One of the common symptoms observed in people infected with dengue fever is

During acute myocardial infarction which of the following changes occurs in the ECG ?