Chapter 18

Which of the following organs has papillary muscles? (a) Ciliary body (b) Legs (c) Wall of heart (d) Mammary glands

Bundle of HIS consists of (A) Right bundle branch (B) Left bundle branch (C) Purkinje fibres (D) AV bundle (a) \(\mathrm{A}, \mathrm{B}\) and \(\mathrm{C}\) only (b) A, B, C, D (c) B, C and D only (d) \(\mathrm{C}\) and \(\mathrm{D}\) only

Bicuspid valve/mitral valve is found between (a) Left atrium and left ventricle (b) Right atrium and right ventricle (c) Right atrium and left ventricle (d) Left atrium and right ventricle

Tricuspid valve is present between the (a) Two atria (b) Two ventricles (c) Left atrium and left ventricle (d) Right atrium and right ventricle

Chordae tendinae are found in (a) Joints (b) Atria of heart (c) Ventricles of heart (d) Ventricles of brain

Ventricles are thick-walled as compared to atrium because (a) It is to receive blood from atria (b) It is present on the posterior side (c) It has to pump blood (d) None of these

Papillary muscles are located in (a) Heart ventricles of human (b) Dermis of mammalian skin (c) Orbits of vertebrate eyes (d) Pylorus of vertebrate stomach

Purkinje fibres are found in (a) Brain (b) Kidneys (c) Skin (d) Heart

Which of the following has the thickest wall? (a) Left auricle (b) Left ventricle (c) Right auricle (d) Right ventricle

'Heart of heart' is (a) SA node (b) AV node (c) Bundle of HIS (d) Purkinje fibres

SA node is located in (a) Upper left corner of right atrium (b) Lower left corner of left atrium (c) Lower right corner of left atrium (d) Upper right corner of right atrium

Human heart is (a) Neurogenic (b) Myogenic (c) Cardiogenic (d) Digenic

Which of the following term does not apply to human heart? (a) Pacemaker (b) Four chambered (c) Mitral valve (d) Neurogenic

Rate of heartbeat is determined by (a) SA node (b) AV node (c) Purkinje fibres (d) Papillary muscles

In amphibia, the heart has (a) Two auricles and two ventricles (b) Two auricles and one ventricle (c) One auricle and two ventricles (d) One auricle, one ventricle and one sinus venosus

SA node is called the pace maker of the heart. Why? (a) It can change contractile activity generated by AV node. (b) It delays the transmission of impulse between the atria and ventricles. (c) It gets stimulated when it receives neural signal. (d) It initiates and maintains the rhythmic contractile activity of heart.

Sino-Atrial node (SAN) can generate impulses (a) \(70-75 \mathrm{~min}^{-1}\) (b) \(50-55 \mathrm{~min}^{-1}\) (c) \(35-40 \mathrm{~min}^{-1}\) (d) \(90-100 \mathrm{~min}^{-1}\)

The impulse of heartbeat originates from (a) SAN (b) \(\mathrm{AVN}\) (c) Vagus nerve (d) Cardiac nerve

Rate of heart is determined by (a) SAN (b) \(\mathrm{AVN}\) (c) Purkinje fibres (d) Bundle of His

Bundle of HIS is a group of (a) Ganglia (b) Nerve fibres (c) Muscular fibres (d) Connective tissue

Bundle of HIS found in (a) Right atrium (b) Left atrium (c) Both (a) and (b) (d) Interventricular septum

An atrioventricular valve prevents the back flow or leakage of blood from the (a) Right ventricle into the right atrium (b) Left atrium into the left ventricle (c) Aorta into the left ventricle (d) Pulmonary vein into the right atrium

How many double circulation are normally completed by the human heart in one minute? (a) 8 (b) 16 (c) 36 (d) 72

The duration of cardiac cycle in a normal man is (a) \(0.8\) seconds (b) 80 seconds (c) 60 seconds (d) 72 seconds

During systole of heart (a) Only atria contracts (b) Only ventricles contract (c) Atria and ventricles contract separately (d) Atria and ventricles contract simultaneously

During diastole, blood (a) Enters the heart (b) Leaves the heart (c) Leaves the ventricle (d) Enters into lungs

During ventricular systole the oxygenated blood is pumped into the (a) Aorta and deoxygenated blood is pumped into the pulmonary artery. (b) Pulmonary artery and deoxygenated blood is pumped into the artery. (c) Aorta and deoxygenated blood is pumped into pulmonary vein. (d) Pulmonary vein and deoxygenated blood is pumped into pulmonary artery.

To reach the left side of heart, the blood must pass through (a) Lungs (b) Liver (c) Kidneys (d) Sinus venosus

Mammals are said to have double circulation. It means (a) Blood vessels are paired. (b) There are two types of blood vessels attached to every organ. (c) There are two systems, one from the heart to the lungs and back to the rest of the body. (d) Blood circulates twice through the heart.

In mammals, veins differs from arteries in having (a) Thicker walls (b) Deeply present (c) Carry blood away from heart (d) Internal valves

An artery is (a) Thick walled in which blood flows under low pressure. (b) Thin walled in which blood flows under high pressure. (c) Thick walled in which blood flows under high pressure. (d) Thin walled in which blood flows under low pressure.

Cells constituting the wall of capillaries are (a) Parietal (b) Endothelial (c) Oxyntic (d) Haemocytes

A muscular wall is absent in (a) Venule (b) Vein (c) Capillary (d) Arteriole

Contraction of right ventricle pumps blood into (a) Dorsal aorta (b) Pulmonary vein (c) Coronary artery (d) Pulmonary artery

Arteries carry oxygenated blood except in (a) Pulmonary (b) Cardiac (c) Hepatic (d) Systemic

When ventricular systole occurs (a) Atrial diastole coincides (b) Tricuspid and bicuspid valves close (c) Semilunar valves guarding pulmonary artery and aorta are forced to open (d) All the above

Which of the following events do not occur during joint diastole? A. All four chambers of heart are in relaxed state. B. Tricuspid and bicuspid valves open. C. Action potential is conducted from SAN to AVN. D. Blood from the pulmonary veins and vena cava flows into the left and right ventricles respectively through the left and right atria. \(\mathrm{E}\). The semilunar valves are closed. (a) Only E (b) Only \(\mathrm{C}\) (c) Only D (d) Only \(\mathrm{A}\) and \(\mathrm{B}\)

The amount of blood to be pumped out by each ventricle/minute is (a) Stroke volume (b) Cardiac output (c) ERV (d) \(\mathrm{ZRV}\)

During cardiac cycle each ventricle pumps out about \(70 \mathrm{~mL}\) of blood which is called (a) Stroke volume (b) Cardiac output (c) Tidal volume (d) Residual volume

Which of the following statement is incorrect? (a) Cardiac output of an athlete is much higher than that of an ordinary man. (b) In each minute a single cardiac cycle is performed. (c) During each cardic cycle two prominent sounds are produced. (d) Cardiac cycle includes atrial systole, ventricular systole and joint diastole.

Identify the correct sequence of events in a cardiac cycle: (a) Diastole, atrial systole, ventricular diastole (B) Atrial systole, ventricular diastole, ventricular systole (c) Atrial systole, ventricular systole, joint diastole (d) Ventricular diastole, diastole, ventricular systole, atrial systole

First cardiac sound (lub) is associated with (a) Closure of tricuspid and bicuspid valves (b) Opening of tricuspid valves (c) Closure of semilunar valves (d) Opening of semilunar valves

Which of the following statement is wrong for second cardiac sound? (a) It is heard as dup (b) It is produced due to the closure of semilunar valves (c) It is clinically significant (d) It is clinically nonsignificant

Which of the following is correct about human heart? (a) The volume of both atria \(>\) the volume of both ventricles (b) The volume of both ventricle \(>\) the volume of both atria (c) The volume of both atria \(=\) the volume of both ventricles (d) Ventricles are upper chambers and atria are lower chambers in our heart.

Which of the following blood vessels possess semilunar valves? (a) Vena cava and aorta (b) Aorta and pulmonary artery (c) Pulmonary artery and pulmonary vein (d) Pulmonary vein and vena cava

The heartbeat of a person increases at the time of an interview due to the secretion of (a) Renin (b) Adrenaline (c) \(\mathrm{ADH}\) (d) \(\mathrm{ACTH}\)

Cardiac centre lies in (a) Medulla oblongata (b) Pons (c) Cerebrum (d) Epithalamus

Cardiac centre can moderate the cardiac functions through (a) Somatic neural system (b) Parasympathetic nervous system only (c) Autonomic nervous system (ANS) (d) Sympathetic nervous system only

Neural signal through the sympathetic nervous (part of ANS) increases the cardiac output because of (a) Increasing the rate of heatbeat (b) Increasing the strength of ventricular contraction (c) Both (a) and (b) (d) Increasing the stimulation of vagus nerve

Parasympathetic neural signal decreases the cardiac output by (a) Decreasing the rate of heartbeat (b) Decreasing the speed conduction of action potential (c) Both (a) and (b) (d) Increasing adrenal medulla hormones secretion