Test Preparation on Body fluids and circulation - Biology Test Series for NEET - 2020

Systemic heart refers to

1The two ventricles together in humans
2The heart that contracts under stimulation from nervous system
3Left auricle and left ventricle in higher vertebrates
4Entire heart in lower vertebrates

The problem of electrical discontinuity caused in the normal
heart by the connective tissue separating the atria from the
ventricles is solved by

1Coordinating electrical activity in the atria with electrical activity in the ventricles by connecting them via the bundle of His
2Having the A–V node function as a secondary pacemaker
3Having an ectopic pacemaker
4Coordinating electrical activity in the atria with electrical activity in the ventricles by connecting them via the vagus nerve

Which one of the following is a matching pair

1Lubb – sharp closure of AV valves at the beginning of ventricular systole
2Dup – sudden opening of semilunar valves at the beginning of ventricular diastole
3Pulsation of the radial artery-valves in the blood vessels
4Initiation of the heart beat Purkinje fibres

(a) Lubb is the first, low pitched heart sound produced due to the closure of bicuspid and tricuspid valves at the start of ventricular systole.

In the heart of mammals the bicuspid valve (mitral valve) is
situated between

1Left auricle and left ventricle
2Post caval and right caval
3Right auricle and left auricle
4Right ventricle and pulmonary aorta

(a) The bicuspid valve is a valve consisting of two membranous flap or cups situated between the atrium and ventricle of the left side of the heart in mammals.

Ventricular diastole occurs due to a/an

1Organ system
2Cell organelle
3Tissue
4Organ

Epinephrine is secreted by

1Adrenal medulla and increases the heart rate
2Adrenal medulla and decreases the heart rate
3Adrenal cortex and increases the heart rate
4Adrenal cortex and decreases the heart rate

Heart beat can be initiated by
Or
The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will be grafted at the site of

1Sino-auricular node
2Atrio-ventricular node
3Sodium ion
4Purkinje's fibres

The other term for heart attack is

1Coronary thrombosis
2Myocardial infarction
3Cardiac arrest
4Ischaemia

Read the statements regarding the cardiac system and choose the right option
A. Human heart is an ectodermal derivative
B. Mitral valve guards the opening between the right
atrium and left ventricle
C. SAN is located on the left upper corner of the right
atrium
D. Stroke volume ´ Heart rate = Cardiac output

1A alone is correct
2A and B alone are correct
3B and C alone are correct
4D alone is correct


Right Ans	Wrong Ans	Not Attempted

Test Preparation on Body fluids and circulation - Biology Test Series for NEET - 2020

Systemic heart refers to

The problem of electrical discontinuity caused in the normalheart by the connective tissue separating the atria from theventricles is solved by