Biology - Comprehensive Mock Test 44

Question 431 Medium

In humans, blood passes from the post caval to the diastolic right atrium of heart due to?

A) Pressure difference between the post caval and atrium B) Pushing open of the venous valves C) Suction pull D) Stimulation of the sino auricular node

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Question 432 Medium

The cells lining the blood vessels belong to the category of ?

A) Columnar epithelium B) Connective tissue C) Smooth muscle tissue D) Squamous epithelium

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Question 433 Hard

If due to some injury the chordae tendinae of the tricuspid valve of the human heart is partially non-functional, what will be the immediate effect?

A) The flow of blood into the pulmonary artery will be reduced B) The flow of blood into the aorta will be slowed down C) The pacemaker will stop working D) The blood will tend to flow back into the left atrium

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Question 434 Easy

What is true about RBCs in humans?

A) They do not carry CO2 at all B) They carry about 20-25 percent of CO2 C) They transport 99.5 percent of O2 D) They transport about 80 percent oxygen only and the rest 20 percent of it is transported in dissolved state in blood plasma

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Question 435 Medium

Which type of white blood cells are concerned with the release of histamine and the natural anti coagulant heparin?

A) Monocytes B) Neutrophils C) Basophils D) Eosinophils

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Question 436 Hard

Which one of the followings refers to blood cancer characterized by uncontrolled proliferation of abnormal/immature white blood cells in the bone marrow?

A) Hypertension B) Atherosclerosis C) Leukemia D) Pulmonary embolism

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Question 437 Medium

Atrioventricular valves are supported by strands of connective tissue called ______?

A) endocardium B) myocardium C) chordae tendineae D) cardiac fibers

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Question 438 Easy

In higher vertebrates, SA node helps in ?

A) Opening of tricuspid valve B) Initiation of heart beat C) Conduction of blood D) Opening of bicuspid valve

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Question 439 Easy

In ECG, P-R interval corresponds to ?

A) Time interval between onset of ventricular contraction B) Time delay in A-V node C) S-A nodal conduction time D) Increased ventricular contraction

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Question 440 Easy

Oxygenated blood occurs in ?

A) Pulmonary artery B) Right atrium C) Right ventricle D) Pulmonary vein

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