Biology - Mock Test 108

Question 1071

The average diameter of Red Blood Corpuscles of man is ?

A) 7.2 μm B) 8.1 μm C) 9.2 μm D) 10.3 μm

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Question 1072

The blood calcium level is lowered by the deficiency of?

A) Calcitonin B) Parathormone C) Thyroxine D) Both Calcitonin and Parathormone

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Question 1073

The blood does not clot inside the body because of?

A) Oxygenation of blood B) Movement of blood C) Heparin in blood D) Absence of fibrinogen in blood

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Question 1074

To obtain a standard ECG, a patient is connected to the machine with three electrodes ?

A) One to each wrist and to the left ankle B) One to each ankle and to the left wrist C) One to each wrist and to the left chest region D) One to each ankle and to the left chest region

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Question 1075

The most active phagocytic white blood cells are?

A) Neutrophils and monocytes B) Neutrophils and eosinophils C) Lymphocytes and macrophages D) Eosinophils and lymphocytes

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Question 1076

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 1077

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 1078

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 1079

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 1080

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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