(a) What is the duration of one complete heart beat (cardiac cycle) ?
(b) When do the sounds 'lub' and 'dup' occur ?
(c ) Name the pace maker of the heart.

Describe the sequence of events which occur in the cardiac cycle in humans. Where and how are the sounds lubb and dubb produced in the heart during this cycle ?

(a) What are the upper parts of the heart called ? (b) What are the lower parts of the heart called ? (c) What is the name of blood vessels which connect arteries to veins ? (d) (i) Which side of the heart pumps blood into the lungs ? (ii) Which side of the heart pumps blood into entire body (except the lungs ) ?

How many among the given statements are Incorrect? All of the nodal tissue in human heart is capable of generating 70 - 75 action potentials in a minute.B. Lymph is devoid of all formed elements of blood.C. Cardiac output is defined as the volume of blood pumped by each ventricle in a cardiac cycle.d Wall of left ventricle is thickest among all four chambers of human heart.

How many among the given statements are incorrect? a. All of the nodal tissue in human heart is capable of generating 70-75 action protentials in a minute. b. Lymph is devoid of all formed elements of blood. c. Cardiac output is defined as the volume of blood pumped by each ventricle in a cardiac cycle. d. Wall of left ventricle is thickest among all four chambers of human heart.

Define cardian cycle.What are three phases of cardiac cycle.State the period of occurrence of two heart sounds.

(a) What is mean tby 'heart beat' ? What is the usual heart beat rate at rest ? (b) What cahnge occurs in heart beats if a person runs for a while ? Why ?

Read the following four statements (1-4) (1 ) The second heart sound is DUB, which is associated with the closure of bicuspid and tricuspid valves . (2) The duration between consecutive second and first heart sound is 0.5 second in a cardiac cycle . (3) The heartbeat of a human increase when the adrenaline hormone in injected into it. (4) The atrial systole in a cardiac cycle increase the flow of blood into the respective ventricle by about 70% . How many of the above statements are incorrect ?

Read the following four statements (1-4) (1 ) The second heart sound is DUB, which is associated with the closure of bicuspid and tricuspid valves . (2) The duration between consecutive second and first heart sound is 0.5 second in a cardiac cycle . (3) The heartbeat of a human increase when the adrenaline hormone in injected into it. (4) The atrial systole in a cardiac cycle increase the flow of blood into the respective ventricle by about 70% . How many of the above statements are incorrect ?

(a) What is double circulation? Name two circulations in man. Give its advantages. (b) Name two heart sounds. How are they produced?