- Pacemaker is situated in heart
(a) in the wall of right atrium
(b) on inter auricular septum
(c) on inter ventricular septum
(d) in the wall of left atrium. - First heart sound is
(a) ‘lubb’ due to closure of AV valves
(b) ‘lubb’ due to closure of spiral valves
(c) ‘dup’ due to closure of AV valves
(d) ‘dup’ due to closure of spiral valves. - If the heart sound recording and ECG recordings are
superimposed then the ‘lubb’ sound would occur
(a) at the P wave
(b) just after the T wave
(c) just after the QRS complex
(d) just after the P wave. - T wave of ECG represents
(a) ventricular depolarisation
(b) ventricular repolarisation
(c) depolarisation of atria
(d) auricular repolarisation. - How do parasympathetic neural signals affect the working
of the heart?
(a) Reduce both heart rate and cardiac output.
(b) Heart rate is increased without affecting the cardiac
output.
(c) Both heart rate and cardiac output increase.
(d) Heart rate decreases but cardiac output increases.
(AIPMT 2014) - In the given figure the durations of the
AB
Cevents of the cardiac cycle are given.
Identify these events and select the
correct option.
A B C
(a) Auricular systole Joint diastole Ventricular systole
(b) Ventricular systole Joint diastole Auricular systole
(c) Ventricular systole Auricular systole Joint diastole
(d) Joint diastole Auricular systole Ventricular systole
- Which of the following statements is incorrect?
(a) Veins are typically larger in diameter than arteries.
(b) Due to the small size of capillaries, blood flows more
rapidly in them than in other parts of circulatory system.
(c) Walls of arteries are elastic enabling them to stretch
and shrink during changes in blood pressure.
(d) Veins contain more blood than any other part of circulatory
system. - Blood vessel carrying least CO 2 is
(a) pulmonary vein (b) pulmonary artery
(c) vena cava (d) hepatic vein.
27. Hardening of the wall of small arteries is known as
(a) thrombosis (b) arteriosclerosis
(c) atherosclerosis (d) heart attack.
28. Which of the following statements is incorrect?
(a) The amount of blood pumped each minute often can be
increased more than 100 percent by parasympathetic
stimulations.
(b) Noradrenaline accelerates the heartbeat under normal
conditions while adrenaline do the same function at
the time of emergency.
(c) Most of the cardiac veins drain into a single large vein,
the coronary sinus which empties into the right atrium.
(d) Veins have valves which prevent backward flow of
blood.
29. The system in which the veins begin as capillaries in one organ
and breaks up into capillaries in different organ is called
(a) portal system
(b) pulmonary circulation
(c) systemic circulation
(d) cardiac capillaries.
30. Heart pumps blood more forcefully in older persons than
younger ones due to
(a) decrease in oxygen content of blood
(b) decrease in elasticity of arteries
(c) fall in nutrient content of blood
(d) increase in elasticity of arteries.
31. The given figure shows an angiogram of the coronary blood
vessel. Which one of the following statements correctly
describes, what is being done?
(a) It is coronary artery which has a cancerous growth that
is being removed.
(b) It is coronary artery which is blocked by a plaque and
the same is being cracked.
(c) It is coronary vein in which the defective valves are
being opened.
(d) It is coronary vein blocked by a parasite (blood fluke)
that is being removed.- Select the wrong statement.
(a) One complete heartbeat consists of one systole and one
diastole and lasts for about 0.8 second.
(b) During myocardial infarction, the PR interval in ECG is
lengthened.
(c) SAN can generate the maximum number of action
potential around 70-75 min–1.
(d) Neural signals through the sympathetic nerves can
increase the rate of heartbeat.