Human Circulatory System

Which of the following statement is not true about PLASMA?

• Plasma is a straw coloured, viscous fluid constituting nearly 55% of the blood.

• Fibrinogen, globulins and albumins are the major proteins

• 45% of plasma is water, Protein contribute 15-18 %

• Factors for coagulation of blood are present in the plasma in an inactive form.

Which of the following statements is not true for RBCs?

• RBCs are formed in the red bone marrow in the adults.

• RBCs are devoid of nucleus in most of the mammals

• RBCs have an average life span of 120 days

• The cells are biconvex in shape.

Find the correct statement(s) about WBCs

i) They are non-nucleated

ii) They are colourless

iii) Number of cells 60000-80000 mm^–3 of blood

iv) There are two main categories of WBCs – granulocytes and agranulocytes.

• i and ii

• ii and iii

• iii and iv

• ii and iv

Find the correct statement about human blood grouping

• O is universal recipient

• AB blood can be accepted by person with O blood group

• AB is universal donor

• O blood has no antigen

Find the correct statement about blood clotting

• An injury or a trauma stimulates the platelets in the blood to release certain factors which activate the mechanism of coagulation

• Prothrombin is formed from inactive substance present in the plasma called thrombin

• Fibrins are dissolved in the plasma

• Fibrinogens are network in which blood cells are trapped to form clot

Which statement is not correct?

• Fishes have a 2-chambered heart with an atrium and a ventricle

• Amphibians and the reptiles (except crocodiles), birds have a 3-chambered heart with two atria and a single ventricle

• Mammals possess a 4-chambered heart

• Oxygenaated and deoxygenated blood get mixed in 3 chambered heart

Find the false statement about human heart

• Interatrial septum separates the right and the left atria,

• The entire heart is made of cardiac muscles

• The openings of the right and the left ventricles into the pulmonary artery and the aorta respectively are provided with the semilunar valves.

• The opening between the right atrium and the right ventricle is guarded by bicuspid valve,

Find the false statement

• The sequential event in the heart which is cyclically repeated is called the cardiac cycle

• During a cardiac cycle, each ventricle pumps out approximately 70 mL of blood which is called the stroke volume.

• The stroke volume multiplied by the heart rate gives the cardiac output.

• Duration of a cardiac cycle is 0.8 minute

Find the false statement(s)

i) During each cardiac cycle two prominent sounds are produced

ii) The first heart sound (lub) is associated with the closure of the semilunar valves

iii) The second heart sound (dub) is associated with the closure of the bicuspid and tricuspid valves

iv) Heart sounds can be easily heard through a stethoscope

• i) and ii)

• ii) and iii)

• iii) and iv)

• i) and iv)

The wrong statement about ECG is

• The machine (electro-cardiogram) is used to obtain an electrocardiograph (ECG).

• P-wave represents depolarisation of atria

• The end of the T-wave marks the end of systole.

• QRS complex represents depolarisation of ventricles